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- author "martyr01"
- tags ""
- description ""
- fileName "Psych Final"
- freezingBlueDBID -1.0
- Perception
- Detection of something "out there" in the environment.
- "I see the cat"
- Not necessarily consciously aware
- (re: iconic memory; you could say, "my mind briefly encoded the info, but I didn't even know it"
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Sensation
- Awareness/feeling that includes inner states.
- "I'm in pain"
- Conscious awareness
- You would not say, " I was in terrible pain, but I didn't even know it."
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"5 Senses" to "6 Perceptual systems"
- -Visual system (seeing)
- -Auditory system (hearing)
- -Gustatory system (taste)
- -Olfactory system (smell)
- -Tactile system (touch)
- -Kinesthetic system (body position/movement)
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How do psychologists study perception?
- -Psychological level: performance and especially errors
- -Biology of the perceptual systems
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Bottom-up processing
Analysis that begins with the sensory receptors and works up to the brains integration or sensory information.
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Top-down processing
Information guided by higher-level mental processes, as when we construct perceptions drawing on our experience and expectations.
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subliminal
Below ones absolute threshold for conscious awareness.
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Priming
- The activation, often unconsciously, of certain associations, thus predisposing ones perception, memory, or response.
- -Images and ratings of people
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Subliminal Messages
- -Thirst and advertising
- -Self help tapes
- ...don't really work
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Sensory Adaptation
- -Our eyes are always moving, nerve cells always firing.
- -After constant exposure to a stimuli a nerve cell fires less frequency.
- -Hearing, touch, smell, adapt easily.
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But what about vision?
- Objects don't disappear if you stare at them...
- -Contact lens projector study
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Contact lens projector study
(a) A projector mounted on a contact lens makes the projected image move with the eye. (b) initially the person sees the stabilized image, but soon she sees fragments fading and reappearing.
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Selective Attention
- The focusing of conscious awareness on a particular stimulus, as in the cocktail party effect.
- -Cocktail party effect- attend to one voice among many
- -Change blindness construction worker study
- -Our brain needs to distinguish between figure and ground
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Inattentional blindness
- Failing to see visible objects when attention is directed elsewhere.
- -Gorilla in our midst: When attending to one task (counting basketball passes by one of the three-person teams) about half the viewers display inattentional blindness by failing to notice a clearly visible gorilla passing through.
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Inattentional blindness
- Change blindness
- While a man provides direction to a construction worker, two experimenters rudely pass between them carrying a door. DUring this interruption, the original construction worker switches places with a different person wearing different colored clothing. Most people, focused on their direction giving, do not notice the switch.
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Phi phenomenon
There is no smooth motion across the retina, yet people perceive motion.
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Motion after effect
After watching moving stimulus, stationary stimulus appear to move.
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What's the point...
- -perception of motion not a direct function of motion on retina
- -implies that there are neural sensors dedicated to motion (that are highly activated by the spiral)
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vection
- visually induced perception of motion
- (e.g., watching a moving train though the window of a stationary train)
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General Conclusion
- We sometimes perceive objects moving when...
- -two objects appear in different places, w/no movement (phi)
- -objects doesn't move at all (motion after effect)
- We sometimes perceive motion when object fixed on retina...
- -turn head in parallel with object
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Effects of bodily state on perception
- -ask participants to estimate the angle of a hill
- -get estimates before and after participants run for an hour
-hypothesis: if tired, hill will seem steeper (an automatic recalculation, with survival benefits)
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