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DesLee26
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Sensation vs. Perception
sensation: processing of environmental info to brain from senses; triggers chemical responses from neurons--> action potential
perception: process of selecting, organizing, and interpreting sensory information
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Psychophysics
relationship between outside world and your experience in that world
absolute threshold: minimal about of stimulus needed to detect stimulus
difference threshold: minimal difference needed to notice a change in stimulus
sensory adaptation: repeated/ constant stimulus decreases the number of sensory messages; can be dangerous
Gate control theory of pain: little gate that allows or inhibits pain from entering the brain
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Two mechanisms control the gate
input from other skin senses may take over pathways that pain impulses would have used
the brain can close the gate by descending signals into the spinal cord
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Two theories of color vision
trichomatic theory of color vision and opponent-process theory
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Trichromatic Theory of Color Vision
- three different sized cones; combo of light allows color to be seen
- long-wavelength cones (blue)
- medium (green)
- short (yellow/red)
does not explain afterimage (seeing an object after looking away from it)
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Opponent-process theory
three pairs of cones: red-green/ blue-yellow/ black-white
one activated/ the other inhibited
when you look away, the inhibited becomes activated, and the activated becomes inhibited
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Conduction deafness
middle ear bones fuse and can't vibrate properly
treatment: breaking bones, replacing with plastic ones, using hearing aids
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Nerve deafness
damage to the hair cells (Organ of Corti) of the auditory nerve usually after intense vibrations from loud sounds
hearing aids don't help
once damaged, its for good
today, cochlear implants are being done
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Which two senses go together?
smell (olfaction) and taste (gustation)
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smell+ taste= __
Anosmia
flavor
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