Chapter 4 - Sensation and Perception

The process of focusing on one sensory channel and

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– the process of focusing on one sensory channel and ignoring others o Filter theory of attention and the dichotic listening task o Cocktail party effect – big party, talking to friends, attending to all the conversations going on around you Synesthesia – sensory information processed in wrong cortical areas o Information interpreted as more than one sense o For example, people start to interpret it as not only a visual stimulus, but also an audio stimulus Subliminal stimuli – stimuli just below level of conscious awareness Seeing / The Eye Sight is the most heavily studied sense—perhaps because it plays such a fundamental role in most people’s everyday lives Light – measured in wavelengths o Brightness – intensity o Saturation – purity (how much red, how much blue, etc.) o Hue – color Iris – muscle that gives eye its color Pupil – hole through which light enters; low light vs. bright light Cornea – clear membrane that covers the eye surface; refracts light to focus it on the retina Lens – focuses light on retina; changes curvature ( accommodation ) to refract light on the back of the eye
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Shape of the eye affects how much the lens must bend light to focus it Retina – back of eye where light is focused o Three layers – rods and cones, bipolar cells, ganglian cells Cones located in fovea; responsible for day vision (color) Rods in periphery; night vision (black and white) o Blind spot – absence of rods and cones
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  • Summer '07
  • Leader
  • Psychology, Lateral geniculate nucleus, secondary visual cortex

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