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WHAT IS COGNITIVE NEUROSCIENCE?:
- looks at cognitive processes
- uses a lot of techniques e.g. behaviour, eye-tracking, physiology, neuroimaging and case-studies.
- examines humans and non-human animals.
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IV'S?:
CAN BE CATEGORICAL/DISCRETE WHICH MEANS THAT THEY HAVE LEVELS OR CONDITIONS e.g. with "handedness" you could have L, R OR AMB. OR CONTINUOUS E.G. AGE. common IV'S are e.g. individual difference variables, neuropsychological case vs. healthy participants and TMS.
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DV'S?:
- NORMALLY CONTINUOUS E.G. RT. BUT CAN BE CATEGORICAL E.G. RANKS.
- common DV'S are e.g. electroencephalography EEG, ERP, eye-tracking, accuracy and RT, FRMRI, MVPA, DTI AND MEG.
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THE TYPES OF EXPERIMENTAL DESIGNS?:
repeated-measures aka. within and; independent groups aka. between.
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PRINCIPLES TO USE INTERPRETING THE EXPERIMENTAL DESIGN?:
- good to have a good question or hypothesis going in
- Has been derived from research.
- Powerful designs normally have to theories that predict different data.
- exploratory research is good when not much is known. This can then motivate the future research.
- need to be specific, falsifiable e.g. has conditions that can be falsified.
- operationization.
- paradigms should be carefully chosen and be optimal.
- THE CRITICAL ANALYSIS SHOULD MATCH THE CONCEPT TO THE OPERALIZATION AND THE DATA AND THE CONCLUSION.
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THE TWO FACTORS THAT HAVE BEEN THEORIZED TO CONTRIBUTE TO OBJECT CORRESPONDENCE?:
- SPATIOTEMPORAL TRAJECTORY. E.G. does it come back at the same location that was expected from the object's initial trajectory. (Features are the same).
- AND FEATURE SIMILARITY E.G. does it have the same properties (e.g. colour and shape) as the original object? (The trajectory is the same).
- BOTH WOULD BE A COLOUR AND LOCATION CHANGE.
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HOW TO MEASURE OBJECT CORRESPONDENCE?:
- HAVE A SAME-OBJECT TRIAL E.G. there's a square (S) and a triangle (P). Then they move and the P re-appears in the triangle.
- DIFFERENT-OBJECT TRIAL E.G. THE SAME AS BEFORE BUT THE P RE-APPEARS IN THE SQUARE.
- RT IS NORMALLY FAST FOR THE SOC THAN THE DOC. THIS DIFFERENCE IS CALLED THE "OBJECT-SPECIFIC PREVIEW BENEFIT".
- The first evidence that the brain tracks objects e.g. with the motion linked to the shapes we would expect a certain letter to re-appear in a certain shape.
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FLOMBAUM AND SCHOLL (2006)?: ***SLIDE 56.
- DETECTED FEATURE CHANGES IN TRAVELLING AND TEMPORARILY OCCLUDED OBJECTS.
- THEY MANIPULATED SPATIOTEMPORAL TRAJECTORY AND MEASURED HOW THESE CHANGES AFFECTED THE CHANGE DETECTION
- e.g. had 3 pillars and a ball that rolled behind them. The manipulation was when the ball went in at the top and came out the bottom. Participants then had to click a button when there was a colour change.
- Believed that participants would be quicker (and more accurate) at detecting feature changes after occlusion when they were able to perceive the same object through time.
- There would be bad change detection when they thought that they were 2 distinct objects.
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THE DATA?:
WERE WAY BETTER AT DETECTING IN THE TUNNEL CONDITION THAN THE SPATIAL OR TEMPORAL MANIPULATIONS. THESE IMPAIRED THEIR COLOUR DETECTION. NOT SUPPORTIVE E.G. lecture. said that we have a "spatiotemporal bias". didn't examine the features by themselves (e.g. without the OC) and didn't consider an important aspect in their interpretation.
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OBJECT CORRESPONDENCE?:
is the object that comes out the same/different when it passes behind an occluder.
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THE FUSIFORM GYRUS?:
THE FUSIFORM FACE AREA (AKA. FFA). CAN ALSO ENCODE ANY TYPE OF EXPERTISE.
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YI ET. AL (2008).
- USED THE FFA AND MEASURED OBJECT CORRESPONDENCE IN RELATION TO REPETITION SUPPRESSION. greater suppression = treating it as the same object to a greater extent.
- FOUR CONDITIONS E.G.
- 1. continuous and unrepeated (e.g. same occluder and different face).
- 2. continuous and repeated (e.g. same occluder and the same face).
- 3. discontinuous and unrepeated (e.g. object emerges from a different occluder + different face).
- 4. discontinuous and repeated (e.g. emerges from a different occluder + the same face).
- there was a bigger difference between the unrepeated and the related trials in the continuous trial.
- didn't examine the features by themselves (e.g. without the OC).
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HOLLINGWORTH AND FRANCONERI (2009)?:
- USED A CHANGE DETECTION MEASURE E.G. HAD TO JUDGE WHETHER 2 IMAGES WERE THE SAME OR DIFFERENT TO THE PREVIEW.
- in 1/2 the trials one pair of the objects changed throughout the trial.
- manipulated spatiotemporal trajectory and the features pre-and-post occlusion.
- OC was measured with RT (assumed that RT would be quicker when there's more object correspondence. Can detect the changes quicker).
- WERE FASTER IN THE CONSISTENT CONDITIONS. 2. CONSISTENT POSITION AND INCONSISTENT COLOUR; 3. CONSISTENT COLOUR AND INCONSISTENT POSITION AND; 4. INCONSISTENT.
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RICHARD ET. AL (2008)?:***SLIDE51AND53.
- USED SACCADES TO MEASURE OC. THEIR TASK WAS TO MOVE THEIR EYES FROM THE CENTRE OF THE SCREEN TO THE SIGNALED TARGET.
- exploited "saccadic suppression".
- Each trial had different positions and different features. Recorded RT and whether the correct saccade was made.
- how does changing the position interfere saccading to the target feature?
- how does changing the feature interfere with saccading to the target position?
- POSITION + FEATURE CHANGES INTERFERED WITH THEIR ABILITY TO INFER OC
- WERE GOOD WHEN THERE WAS NO SWITCH. OK WHEN THERE WAS A SACCADE TO POSITION AND INCONSISTENT COLOUR. WORSE WHEN THERE WAS A SACCADE TO COLOUR AND AN INCONSISTENT POSITION. They needed to correct their saccade more in this condition as well.
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RICHARD ET. AL (2008) EXP.2?:
- USED REAL-WORLD AND RECOGNIZABLE OBJECTS E.G. A TOMATO AND A DUCK.
- THERE WAS THE SAME PATTERN (incl. saccadic correction).
- POSITION AND FEATURE CHANGES INTERFERED WITH THE OC FOR REAL-WORLD OBJECTS.
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HEIN AND MOORE (2012)?:***SLIDE60.
- USED THE TERNUS DISPLAY E.G. LOOKED AT HOW FEATURES IMPACTED OBJECT GROUP AND OC.
- e.g. element motion (ABC-BCA) AND group motion (ABC-ABC). done with colours + lines etc.
- polarity, colour and orientation (+hue) all bias our perception towards group AND element motion. They all effect our inference of OC.
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THE FINAL VERDICT?:
THERE IS A LOT OF EVIDENCE THAT SUGGESTS THAT BOTH FEATURES AND SPATIOTEMPORAL TRAJECTORY EFFECT OC IN THE ENVIRONMENT (E.G. OCCLUSION)+ A PARTICIPANT'S OWN EYE-MOVEMENTS.
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SPATIAL ATTENTION?:
THE ABILITY TO SELECTIVELY PROCESS ANY INCOMING SENSORY INFORMATION AND FILTER OUT IRRELEVANT VISUAL NOISE.
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THE TYPES OF SPATIAL ATTENTION?:
- ORIENTING ATTENTION e.g. shifting your attention across the visual field.
- SPLITTING ATTENTION e.g. attending to two (or more) spatially different locations at the same time.
- ATTENTION BREADTH e.g. changing the spatial region over which your attention is focused (e.g. little to big).
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OVERT VS. COVERT?:
O = WITHOUT EYE MOVEMENTS AND C = WITH EYE MOVEMENTS.
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ENDOGENOUS VS. EXOGENOUS ATTENTION?:
- ENDOGENOUS = voluntary and top-down. draws our attention to stimuli based on our current goals.
- E.G. LOOKING AT THE CAFE DOOR WHEN YOU'RE EXPECTING SOMEONE THERE.
- EXOGENOUS = involuntary and bottom-up. driven by the environment.
- E.G. AN UNEXPECTED MOUSE RUNNING PAST.
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WHAT IS ATTENTION BREADTH?:
- WE ALTER THE SPATIAL REGION OVER WHICH OUR ATTENTION IS DISTRIBUTED.
- IT GIVES US INSIGHT INTO COGNITION.
- e.g. does altering the breadth of attention effect our visual perception? Relatively new area of research.
- First examined how narrow vs. broad attention effect target detection RT's.
- Now looking at how attention effects other components of vision. There's no clear-cut approach.
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THE ZOOM-LENS MODEL?:
- THE MOST USED MODEL THAT EXPLAINS THE RELATIONSHIP BETWEEN ATTENTIONAL BREADTH AND PERCEPTION eg. predicts that as attentional breadth ^'s, perception processing decreases.
- WAS INITIALLY TESTED AS AN EXOGENOUS CUEING PARADIGM.
- e.g. used 8 letters in a circle. endogenously cued letters were underlined (more = a broader breadth of attention). RT was longer with broader breadths.
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AN EXOGENOUS CUEING PARADIGM?:
- A BRIEFLY PRESENTED (AND PERIPHERAL) VISUAL CUE DIRECTS OUR ATTENTION TO A CERTAIN LOCATION.
- HAVE TO RESPOND AS ACCURATELY AS YOU CAN WHEN THE TARGET APPEARS.
- It appears at the cued location (e.g. valid) or at a non-cued location (e.g. invalid).
- e.g. the red box is the cue and the target is a smiley face.
- BETTER AT THE VALID TRIALS == THERE IS BETTER VISUAL PROCESSING AT THE CUED LOCATION.
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THE ZOOM LENS MODEL MULLER ET. AL (2003)?:
- FMRI WAS USED TO EXAMINE HOW NARROW AND BROAD ATTENTION CHANGED THE ACTIVATION IN THE VISUAL CORTEX.
- e.g. participant's had a broad or narrow cueing manipulation. Had to detect a blue target and RT was recorded.
- Looked at the intensity and distribution of retinotopic activity in the PVC.
- NARROW ATTENTION HAD MORE INTENSE ACTIVATION OVER A SMALLER REGION IN THE PVC.
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THE SELECTIVE SPATIAL ENHANCEMENT?:
- older research only used tasks that had the participants process fine spatial detail. THERE'S OTHER EFFECTS (e.g. the visual pathways).
- e.g. narrow attention effects the parvocellular pathway not magnocellular.
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THE SSE EXPERIMENT?:
- USED A SHAPE INDUCER TASK TO MANIPULATE ATTENTIONAL BREADTH (e.g. had small (narrow) and big (broad) circles and ovals).
- 80% were inducer trials;
- 20% measured how attentional breadth effected the P&M processing in the task.
- SPATIAL ACUITY (P) e.g. had a small gap in the shape and TEMPORAL ACUITY (M) e.g. had to detect whether the circle flickered.
- assumed that better AC/RT meant ^perceptual sensitivity.
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THE SSE EXPERIMENT DATA?:
- AB EFFECTED THE SPATIAL-GAP TASK AND NOT THE TEMPORAL-GAP TASK. It only effected the parvocellular cells.
- This is because the main function of AB is to help with fine-spatial processing.
- Could have used HSF'S AND LSF'S to test this.
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PARVOCELLULAR CORTICAL NEURONS?:
- GOOD AT PROCESSING COLOUR AND FINE SPATIAL-DETAIL.
- SLOWER RESPONSE (E.G. THEY CAN'T PROCESS FINE CHANGES VERY QUICKLY).
- SMALL RF'S.
- parvocellular has high spatial resolution (detail) and bad temporal resolution.
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MAGNOCELLULAR CORTICAL NEURONS?:
- CAN'T PROCESS COLOUR BUT GOOD A PROCESSING COARSE SPATIAL DETAIL.
- FASTER (E.G. CAN PROCESS FINE TEMPORAL DETAIL).
- magnocellular has high temporal resolution and low spatial resolution.
- BIG RF'S.
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THE SSE EXPERIMENT WITH SF'S?:
- USED A SHAPE INDUCER TASK. HSF'S AND LSF'S WERE USED. Is the shape tilted to the L/R?
- attention only effected the parvocellular cells (e.g. HSF'S) discrimination accuracy.
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THE SPATIOTEMPORAL TRADE-OFF MODEL?:
- We know that PC have SRF'S and that MC have BRF'S and that NA maps onto the SRF'S (P) and that BA maps onto the LRF'S (M).
- Each improves the processing of their respective counterpart. Therefore, there's a tradeoff (e.g. one sacrifices a bit of itself to use the other).
- MOUNTS AND EDWARDS (2017) USED EXOGENOUS CUEING TO CHANGE AB AND FOUND THAT NA ^SA AND BA ^TA (e.g. which improve their respective P&M processing pathway).
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THE OUTCOMES OF ALL THREE?:
- The ZLM argues that NA helps visual processing more than BA.
- The SSEM argues that changes in attentional breadth only effect the parvocellular cells.
- The STTOM argues that NA improves the PC and BA improves the MC.
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THE METHODOLOGICAL CONSIDERATIONS?:
- EXOGENOUS + ENDOGENOUS ATTENTION MIGHT HAVE DIFFERENT IMPACTS ON THE P&M CELLS.
- changing the task difficulty can change the BOA.
- e.g. perceptual load (e.g. low = BA and high = NA) AND cognitive load ((e.g. high = BA and low = NA).
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THE FACTORS THAT EFFECT FACE RECOGNITION?:
- STIMULUS QUALITY (e.g. lighting, expression and blur etc.)
- EYE LEVEL EFFECTS AND INPUT (e.g. age and age-related macular degeneration).
- BRAIN LEVEL EFFECTS (e.g. prospagosia, "super-recognizers" and genes).
- 60% hertiable and a big % of this is not shared with object recognition genes and general IQ.
- THE ENVIRONMENT AND EXPERIENCE (e.g. other-race effects).
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STIMULUS VARIABILITY?:
- will use two side-by-side photos but in real life faces can be viewed from different views, lighting (+expressions and hair-styles etc).
- They also use high-quality images e.g. in an 8-person line-up (degraded images) participants correctly identified 30% of the people.
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THE EYE-LEVEL EFFECTS?:
- THE MOST COMMON PROBLEM IS UNCORRECTED REFRACTIVE ERROR (esp. in old people).
- eg myopia (nearsightedness, hyperopia (farsightedness), presbyopia (age related) and astigmatism.
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PROSOPAGNOSIA?:
- ACQUIRED (e.g. lose the ability to recognize faces. Result of a head-injury/stroke)
- CONGENITAL (e.g. recognition deficits with no other vision/brain problems).
- SUBTYPES e.g. face-specific/not, heritable and different components are effected.
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FACES ARE HOLISTICALLY PROCESSED WHEREAS OTHER OBJECTS ARE NOT.
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SUPER-RECOGNIZERS?:
1-2%. RECOGNIZE PEOPLE AFTER MANY YEARS AND OUT OF CONTEXT e.g. are used to help police match suspects from CCTV.
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"OTHER-GROUP" OR "OTHER-RACE" EFFECTS?:
- IT'S HARDER TO RECOGNIZE FACES THAT AREN'T SIMILAR TO OURS.
- GROUPS WITH LESS EXPERIENCE MIGHT SHOW BIGGER EFFECTS (but there's no direct correlation between ORE and experience).
- age the experience is acquired is important (e.g. early childhood). 9MTH-old's are favouring faces.
- asymmetries (e.g. white people show the effect but asian/black don't. Could be to do with other factors like power and SES).
- THESE CATEGORIES AREN'Y ALWAYS SALIENT (eg. the university effects vanished when race effects were also included).
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HOW CAN WE IMPROVE FACE RECOGNITION?:
- AVERAGE LOW QUALITY IMAGES (e.g. it removes problems with lighting and blur)
- HELPING PEOPLE WHO HAVE EYE PROBLEMS AND PROSOPAGNOSIA.
- TRAINING AND AWARENESS (e.g. passport-officers who have been trained are no better than students with no training).
- e.g. prosopagnosia child was trained to recognize family member's features.
- Had ^fixations to internal features for both familiar and unfamiliar faces after this.
- individuation training can <ORE and implicit bias.
- Even experimenters just telling the participants to individuate can help.
- USING CROWD ANALYSIS AND SWARM INTELLIGENCE.
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VALENTINE (1991)-FACE-SPACE?:
- FACES ARE ENCODED ON A NO. OF DIMENSIONS AS POINTS AND VECTORS THAT ARE RELATIVE TO A PROTOTYPE/NORM FACE.
- was originally used to explain race-effects. +faces that are more unusual are hard to recognize because they're further from the centre.
- is there one norm or heaps? They might be temporarily formed based on the task.
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BRUCE AND YOUNG (1986)?:
HAS VARIABLE AND LESS VARIABLE ASPECTS OF FACE RECOGNITION?
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VISUAL ATTENTION?:
- THE MECHANISM THAT LETS US SELECTIVELY PROCESS VISUAL INFORMATION IN OUR ENVIRONMENT.
- THERE'S DIFFERENT TYPES (e.g. spatial, object-based and feature-based).
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THE POSNER CUEING PARADIGM?:
- CAN MANIPULATE WHERE THEIR ATTENTION IS ALLOCATED.
- A VISUAL CUE DIRECTS THEIR ATTENTION TO A CERTAIN LOCATION.
- HAVE TO PRESS A KEY AS SOON AS THE TARGET IS SEEN. (e.g. a shape) OR TO DISCRIMINATE A TARGET (e.g. E vs. F).
- THE TARGET WILL EITHER APPEAR AT THE CUED LOCATION. (e.g. the valid trial) OR THE NON-CUED LOCATION (e.g. the invalid trial).
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QUANTIFYING THESE ATTENTIONAL EFFECTS?:
- RT'S ARE FASTER FOR THE VALID TRIALS.
- THIS IS EVIDENCE THAT THE ATTENTIONAL SPOTLIGHT HAS BEEN SHIFTED TO A CUED LOCATION.
- The AS is the region over which attentional resources are allocated.
- CAN QUANTIFY THIS WITH A CUEING SCORE ~ (e.g. the difference in RT between valid and invalid trials).
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HOW TO SET UP A CUEING PARADIGM FOR EXOGENOUS CUEING?:
- THE CUE NEEDS TO BE A SALIENT STIMULUS (e.g. the red frame).
- PERIPHERAL.
- IT NEEDS TO BE PREDICTIVE OF THE TARGET'S LOCATION. (50% valid & 50% are invalid).
- HAS A SHORT CUE-TARGET INTERVAL (e.g. 100MS).
- GET INHIBITION OF RETURN AT LONG CUE-TARGET INTERVALS (e.g. 300MS).
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THE INHIBITION OF RETURN (E.G. THE IOR)?:
- HAPPEN WITH EXOGENOUS CUES AT LONG CUE-TARGET INTERVALS (eg 300MS).
- VALID TRIAL > INVALID TRIAL RT.
- Attention is shifted to the cued location.
- Because the time is too long we disengage from the cued location and then attend to the non-cued location instead.
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HOW TO SET UP A CUEING PARADIGM FOR ENDOGENOUS CUEING?:
- THE CUE IS A CENTRAL AND SYMBOLIC CUE (e.g. an arrow).
- THE CUE PREDICTS THE TARGET'S LOCATION (e.g. 75% valid and 35% invalid).
- A LONGER CUE-TARGET INTERVAL IS NEEDED SO THEY CAN INTERPRET THE CUE (e.g. 300MS).
- Jonides (1981) argued that central cues always elicit endogenous attention.
- BUT CENTRAL CUES CAN ALSO ELICIT INVOLUNTARY ATTENTION. (E.G. GAZE).
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GAZE?:
- THE FACE EITHER LOOKS TO THE LEFT OR THE RIGHT.
- THE TARGET IS A SNOWMAN. Participants have to detect him as fast as they can.
- TOLD THAT THE GAZE DOES NOT PREDICT THE SNOWMAN'S LOCATION.
- THERE WERE STILL CUEING EFFECTS (even though the cue was non-predictive.).
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IS "GAZE" SPECIAL?:
- GAZE INFORMATION IS BIOLOGICALLY RELEVANT.
- (e.g. alert, gauges other people's intentions and goals and used in conversations).
- BUT NON-PREDICTIVE CUES ALSO HAD THIS EFFECT. THEY ARE MANUFACTURED STIMULI THAT WE ARE EXPOSED TO A LOT.
- USING THEM IN ENDOGENOUS CUEING MIGHT BE PROBLEMATIC.
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HOW CAN WE ELICIT PURE ENDOGENOUS ORIENTATING?:
- CAN'T USE ARROWS.
- CAN USE NUMBERS OR COLOURS THAT ARE ASSOCIATED WITH CERTAIN SPATIAL LOCATIONS (e.g. 1 = right, 2 = top etc.).
- TRAINING IS NEEDED TO THEY CAN LEARN THIS RELATIONSHIP.
- Good because colours and numbers are not intrinsically linked to spatial locations (like e.g. arrows and gazes are).
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SPATIAL RESOLUTION?:
- THE ABILITY TO SEE FINE DETAIL.
- IS ENHANCED BY BOTH EXOGENOUS AND ENDOGENOUS ATTENTION.
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YESHURUN AND CARRASCO (1999)?:***SLIDE 35.
- TESTED ATTENTION AND SPATIAL RESOLUTION WITH DIFFERENT TASKS (e.g. which side of the square has a gap?; was the line continuous or broken? and; was the upper line displaced to the L/R of the bottom line?).
- CUED (e.g. a green horizontal line) = ABOVE THE TARGET LOCATION. NEUTRAL = IN THE MIDDLE.
- TRANSIENT ATTENTION BECAUSE THE CUE WAS ALWAYS VALID.
- PERFORMANCE WAS GOOD IN THE CUED CONDITION (at big eccentricities). Thus, endogenous cueing also effects our performance on spatial resolution tasks.
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TEMPORAL RESOLUTION?:
- THE ABILITY TO PERCEIVE FINE TEMPORAL DETAIL (E.G. A FLICKER).
- IS IMPAIRED BY EXO. ATTENTION AND ENHANCED BY ENDOGENOUS ATTENTION.
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YESHURAN AND LEVY (2003)?:
- TESTED ATTENTION AND TEMPORAL RESOLUTION.
- Participants had to determine whether two discs were presented with a gap in the middle or whether they were presented continuously.
- HAD A CUED CONDITION (e.g. was a horizontal bar) AND A NEUTRAL CONDITION
- THEIR PERCEPTUAL SENSITIVITY WAS LOWER IN THE CUED CONDITION.
- ATTENTION CAN IMPAIR OUR PERCEPTUAL PERFORMANCE.
- Why does exogenous attention enhance SR and impair TR? Can be explained with P&M cells. MIGHT ENHANCE P-CELLS.
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HEIN, ROLKE AND ULRICH (2006)?:
- EXAMINED HOW ENDOGENOUS ATTENTION EFFECTED TEMPORAL RESOLUTION.
- USED A VALID AND INVALID ARROW CUE.
- Participant's had to decide which dot had appeared first (e.g. the L/R one).
- IT ENHANCED ATTENTION.
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THE MODULATE VISUAL PATHWAYS (MVP) EXPERIMENT?:
- WE HAVE MORE M-CELL INPUT AND LESS P-CELL INPUT FOR VISUAL PERCEPTION NEAR THE HANDS.
- experiment = have to hold their hands on the monitor while doing the task.
- HAS A TEMPORAL-GAP DETECTION (e.g. a quick disappearence.) AND A SPATIAL-GAP TASK (e.g. a gap in the circle).
- WERE WORSE AT THE SPATIAL CONDITION WITH THEIR HANDS NEAR (+overall.) AND BETTER AT THE TEMPORAL CONDITION WITH THEIR HANDS NEAR.
- DID WORSE WITH THEIR HANDS NEAR AT HSF'S (They did a lot better at LSF'S).
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WHY DOES THIS HAPPEN?:
- Each hand has an attentional spotlight.
- When they're both up the spotlights merge into one big spotlight. A LS enchances TA and impairs SA AND A SS enhances SA and impairs the TA.
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THE OSM?:***SLIDE25.
- TEMPORALLY-TRAILING MASK IMPAIRS THE PERCEPTION OF A TARGET.
- e.g. has a simultaneous mask-offset (target is visible with the mask.) and delayed mask-offset (the target is presented first).
- MASKING MAGNITUDE = IS THE DIFFERENCE BETWEEN THE SIMULTANEOUS AND DELAYED MASK-OFFSET CONDITIONS.
- E.G. FOUR CIRCLES WITH GAPS AND THEN FOUR DOTS AROUND THE TARGET.
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THE OBJECT-UPDATING ACCOUNT FOR WHY OSM HAPPENS?:
- THE TARGET'S OBJECT FILE IS CREATED.
- IT THEN IT GETS UPDATED TO REFLECT THE FOUR-DOT MASK.
- OSM HAPPENS BECAUSE THE BRAIN THINKS THAT THE TWO OBJECTS (the target and the mask) ARE ONE (e.g. the mask).
- This prevents the target from being consciously perceived.
- IF THIS IS TRUE THEN =
- The same physical information should be processed differently. (which depends on whether it is perceived as a continuous object or not).
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EVIDENCE***RE-WATCH?:
- 1. The same physical information should be processed differently. (Which depends on whether it is perceived as a continuous object or not).
- 2. The manipulations that cause the brain to treat them as the same object would lead more masking (and vice versa).
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1. LLERAS AND MOORE (2003)?:
- HAD LOTS OF C'S AND PARTICIPANTS HAD TO FIND THE GAP.
- HAS SHORT ISI (short and move as one).
- HAS LONG ISI (long and did not move together = a different object).
- FOUND THE MASKING MAGNITUDE.
- MASKING ONLY HAPPENED IN THE DELAYED OFFSET SHORT ISI CONDITION. THE MASK WAS SEEN AS A CONTINUING OBJECT WHICH = OBJECT UPDATING
- (Long ISI condition = it was seen as a new object that appeared after the target).
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2. LLERAS AND MOORE (2005)?:
- HAD RED C AND RED MASK, GREEN C AND GREEN MASK, GREEN MASK AND RED C AND GREEN C AND RED MASK.
- Same colour would make the brain think that they belonged to the same object (& vice versa). THIS IS WHAT THEY FOUND.
- THERE WAS MORE MASKING IN THE SAME COLOUR CONDITION AND LESS WHEN THEY LOOKED LIKE DISTINCT OBJECT.
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ATTENTION AND THE OSM?:
- USED SET-SIZE TO OPERATIONALIZE THE EXTENT TO WHICH THEIR ATTENTION WAS FOCUSED ON THE TARGET.
- USED 1-16.
- Believed that we wouldn't get masking if their attention was completely focused vs. distributed.
- HAD WORSE % CORRECT WITH BIGGER SET-SIZES.
- THERE WAS A CEILING EFFECT WHICH MIGHT HAVE CREATED THE INTERACTION.
- Another experiment (that used 4-16) found a smaller interaction.
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DO DIRECT ATTENTIONAL MANIPULATIONS EFFECT THE OSM MAGNITUDE?:
- E.G. 1. ATTENTIONAL CUEING.
- 2. MANIPULATING THE SIZE OF THE ATTENDED REGION (breadth re-scaling).
- MANIPULATED CUES.
- DID NOT FIND EVIDENCE THAT ATTENTION (when mediated by cues.) EFFECTED THE OSM MAGNITUDE.
- Did effect performance though which means that the attentional manipulation was working.
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NEUROPSYCHOLOGICAL CASES?:
- WHEN AN INDIVIDUAL OR A GROUP WITH BRAIN DAMAGE ARE STUDIED.
- HELPS US TO UNDERSTAND WHAT COGNITIVE PROCESSES ARE LINK WITH WHAT NEURAL STRUCTURES.
- There's a focus on diagnosis and rehabilitation where it's possible.
- CAN ASK QUESTIONS LIKE E.G. 1. The degree of it's functional specialization?
- 2. Is process "A" mediated by area "B?"
- 3. Are processes "A" and "B" distinct or in the same region?
- e.g. some patients have face perception deficits but not object perception deficits. Does this mean that face and object recognition are distinct processes?
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THE MIXED EVIDENCE FOR OBJECTS AND FACES?:
- SOME HAVE FACE BUT NOT OBJECT DEFICITS.
- e.g. two patients with prosopagnosia could recognize objects but one couldn't.
- CHILD PATIENT L.G HAD IMPAIRMENT ON BOTH.
- ADULT PATIENT N.S COULDN'T INTEGRATE FACES AND OBJECTS INTO A WHOLE.
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SINGLE VS. DOUBLE DISSOCIATION?:
- SINGLE = process "A" is impaired when area "A" is damaged and "B" works.
- DOUBLE = process "A" is impaired when area "A" is damaged and "B" works, AND process "B" is impaired when area "B" is damaged and process "A" works.
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TMS?:
- USE MAGNETIC FIELDS (via a metal coil) TO STIMULATE THE CELLS IN A CERTAIN REGION.
- IT CAUSES A TEMPORARY IMPAIRMENT IN THAT REGION.
- CAN ALSO BE REPETITIVE (E.G. RTMS).
- eg. TMS effected semantic processing in the anterior cortex and that TMS effected phonological processing in the posterior cortex.
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SYNAESTHESIA?:
- THE PERCEPTUAL PHENOMENON IN WHICH ONE SENSATION TRIGGERS ANOTHER SENSATION (e.g. they "taste" shape or "hear" colours).
- THE MOST COMMON IS COLOUR-GRAPHEME.
- MOST ADULT SYNAESTHETES ARE SURPRISED WHEN THEY LEARN THAT IT'S NOT A COMMON THING.
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THE DEVELOPMENT OF SYNAESTHESIA?:
- GENETICS AND DEVELOPMENTAL (e.g. incomplete synaptic pruning).
- THIS COULD BE WHY GRAPHEME-COLOUR IS SO COMMON.
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THE EXPERIMENT WITH SYNAESTHETES AND NORMAL PARTICIPANTS?:
THEY HAD TO RELATE A COLOUR TO A WORD (These were either happy or sad.). MOST OF THE COLOURS WERE EXACTLY THE SAME.
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HOW DO WE KNOW IF SYNAESTHESIA IS REAL?:
CONSISTENCY; BEHAVIOURAL EFFECTS (e.g. accuracy and RT) AND NEUROIMAGNG.
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WHAT ARE THE IMPLICATIONS OF BIG ATTENTIONAL BREADTHS?:
- BETTER AT RECOGNIZING FACES.
- ARE BETTER AT EXTRACTING GLOBAL INFORMATION.
- CAN MAKE US SUSCEPTIBLE TO PERIPHERAL AND TASK IRRELEVANT EMOTIONAL STIMULI.
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MATTINGLEY ET. AL (2001)?:
- 15 COLOUR-GRAPHEME SYNAESTHETES VS. NON-SYNAESTHETIC CONTROLS.
- WANTED TO TEST THEIR CONSISTENCY.
- They were given 150-items with letters, no.'s and words. They had to describe the experience. DID THE SAME EXPERIMENT 3 MONTHS LATER (C = 1M).
- THE SYNAESTHETES WERE WAY MORE CONSISTANT.
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THE STOOP TASK (THE BEHAVIOURAL EFFECTS)?;
- CONGRUENT = THE SAME COLOUR AND WORD ASSOCIATION & INCONGRUENT = NOT.
- RT WAS FASTER FOR THE CONGRUENT TRIALS AND SLOWER FOR THE INCONGRUENT TRIALS IN SYNAESTHETES. Controls were a horizontal line. (didn't matter).
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NEUROIMAGING?:
- THE COLOUR AREA RESPONDS IN "COLOURED" SYNAESTHETES.
- MIGHT BE DISTINCT FROM COLOUR IMAGERY.
- THERE ARE STRUCTURAL DIFFERENCES IN THE BRAIN'S OF SYNAESTHETES AND NON-SYNAESTHETES.
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WHAT IS THE COGNITIVE PROFILE OF THE SYNAESTHETE?:
- THEY HAVE ENHANCED SENSORY PROCESSING.
- THEY HAVE BETTER MEMORY.
- THEY ARE MORE LIKELY TO HAVE ARTISTIC PURSUITS AND BE MORE CREATIVE.
- MORE "OTE" AND FANTASIZING. LOWER ON AGREEABLENESS.
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MACRAE AND LEWIS (2002)?:
- TESTED WHETHER A BIG ATTENTIONAL BREADTH IS GOOD FOR FACE DETECTION
- WATCHED A VIDEO OF A ROBBERY.
- 3 CONDITIONS
- e.g. a global navon task, a local navon task and an unrelated task).
- THEY THEN SAW 8 FACES AND HAD TO DETECT WHICH ONE WAS THE ROBBER.
- GN = 83%, CONTROL = 60% AND LN = 30%. (sig.)
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CHONG AND TREISMAN (2005).
- WANTED TO SEE WHETHER SEARCH STYLE HAD AN EFFECT.
- DID A SERIAL SEARCH (e.g. which one doesn't have a gap. Harder)
- OR A PARALLEL SEARCH (e.g. which one has the gap).
- THEN DID A MEAN DISCRIMINATION TASK (e.g. what was the average size) OR A MEMBER IDENTIFICATION TASK (e.g. what size was here?).
- RT WAS SLOWER FOR ALL SERIAL (e.g. the focused) SEARCHES.
- The mean was considered to be "bigger" in the serial searches & the member was considered to be "bigger" in the parallel searches.
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NOTEBAERT ET. AL (2013)?:
TRAINED PARTICIPANTS TO ASSOCIATE CERTAIN COLOURS WITH AN ELECTRIC SHOCK
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ATTENTIONAL RESIZING?:
- ARE WE ABLE TO SET A BREADTH OF SPATIAL ATTENTION AND RESCALE IT IN A RAPID AND EFFICIENT FASHION. (e.g. driving).
- Are we equally good at expanding vs. contracting our attention?
- CAN BE MANIPULATED VIA TASK DEMANDS AND CHANGING STATES. (emotions).
- ITS WIDELY BELIEVED THAT WE PREFER A BROAD BREADTH OF ATTENTION. Does this mean we are better at expanding than contracting our attention?
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IS THERE A GLOBAL PRECEDENCE EFFECT IN ATTENTIONAL RESIZING?:
- USED THE NAVON TASK.
- HAS A FIXATION CROSS, STIMULUS PRESENTATION AND A RT.
- 3 CONDITIONS (neutral (50/50), global (80/20) & local (80/20)). The second and third conditions were randomized.
- GPRT = LRT IN THE NEUTRAL BLOCK - GRT IN THE NEURTRAL BLOCK. ^+NO.'S = BETTER ON GLOBAL TRIALS.
- CONTRACTION COST = LRT IN THE GLOBAL BLOCK - GRT IN THE GLOBAL BLOCK. ^+NO. = SLOWER FROM BROAD TO NARROW.
- EXPANSION COST = GRT IN THE LOCAL BLOCK - LRT IN THE LOCAL BLOCK. ^NO. = SLOWER GOING FROM NARROW TO BROAD.
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DATA?:
- There was a GPE in the neutral conditions. There was no asymmetry in the EVS.C conditions.
- The participants had just adapted to the task.
- WOULD BE GOOD TO TEST IF ASYMMETRY CHANGES WITH MOTIVATION OR OUR INDIVIDUAL DIFFERENCES.
- EVEN THE REAL-WORLD TASKS (E.G. DRIVING).
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CONSTRUCTS VS. OPERATIONALIZATIONS?:
- CONSTRUCT = A THEORETICAL CONCEPT.
- (e.g. the basis of research questions).
- OPERATIONALIZATIONS == THE METHODS THAT ARE USED TO MANIPULATE AND MEASURE THESE CONSTRUCTS
- (e.g. These are the parameters of the experiment).
- Always look at the gaps between these when critiquing an experiment.
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HOW IS ATTENTIONAL BREADTH OPERATIONALIZED IN THE LITERATURE?:
- NAVON; FLANKER AND THE SPATIAL DISTRIBUTION OF THE IOR.
- But are they all testing the same thing?
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TESTING ALL THREE?:
- NAVON. Measured using the GPS (e.g. RT to local targets - RT's to global targets)
- FLANKER. Varied the distance between the middle and distracted targets.
- RT'S to local target = RT to global target. AND;
- HUTTERMAN BREADTH-OF-ATTENTION TEST.
- Had flashes. (e.g. How many grey squares were on the L/R?.). Varied the distance between the two configurations. Measured accuracy.
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DATA?:
- HAD TEST-RETEST RELIABILITY.
- THE GLOBAL PRECEDENCE EFFECT WAS FOUND IN THE NAVON; RT/ACC. < WITH ^DISTANCE IN THE OTHER TWO.
- HUTTERMAN TEST WAS AN OUTLIER.
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