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15 terms

Sensation and preceptio

STUDY
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Thee key themes of sensation
1. Transduction (translation of stimulus
energy into an electrical code/neural
impulse). Each sense system has receptor
cells (e.g., rods and cones in the eye)
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2. Adaptation: senses are especially sensitive
to changes over time
3. Top-down and Bottom-up processing
How do your expectations and culture affect your
perceptions? Examples of top-down processing
Trichromatic Theory
3 kinds of cones sensitve to diff wavelenghts
Rods
low light, black and white, and periphery
Cones
Brighter light, color vision, centralized
color blindness
malfunction of cones
opponent process theory
receptor cells are linked in pairs, working in opposition in each other
afterimages
some images seem to be oppisite
bipolar cells
recive info directly from ods and cones and send to ganglion cells
ganglion cells
collect and sumerize visual info which is moved out of the back of the eye through bundels of ganglion axons called optic nerve
simultanous contrast
objects look lighter against a dark background then against a light one
monocular depth cues
texture gradient distant objects seem denser
linear prespective
parallel lines appear to converge in the distance
realtive size
objects smaller
context effects
when our expectations influence what we precive
gate control theroy
spinal cord contains a nerological gate that blocks pain signals or allow to pass to the brain