PSYCH 101 Lecture 9: Sensation and Vision

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17 Jan 2019
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PSYCH 101 Lecture 9 Sensation and Vision
Sensation
Sensation: the process by which the senses detect sensory stimuli
and transmit them to the brain
Perception: the process by which sensory information is actively
organized and interpreted by the brain
How do sensory systems work?
Transduction: the conversion of one energy from to another
Example: sensory stimulus --> neural impulse
Receptor cells: specialized cells that respond to a specific
physical stimulus, and are responsible for transduction
Sensory adaptation: the diminished sensitivity to prolonged
stimulation; adaptation of one stimulus can affect the perception of
another; allows us to shift our attention to what is important
Example: when one walks into the kitchen they smell a strong
aroma of food --> time --> one no longer smells the food
Sensory deprivation: the absence of normal external stimulation for
extended periods of time; expectations play a role in how one deals
with sensory deprivation
Example: solitary confinement in prison
Vision
Visual pathway: light --> cornea --> lens --> retina --> photoreceptors
(rods/cones) --> bipolar cells --> ganglion cells --> optic nerve --> blind
spots (no photoreceptors) --> thalamus (responsible for processing
visual information and sending it on --> visual cortex (occipital lobe)
Differences between rods and cones
Rods
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Shape: cylindrical
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Prevalence: 90-95% of photoreceptors
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Location: toward periphery
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Perception of detail: weak
§
Sensitivity to color: no (only black and white)
§
Response to dim light: strong
PSYCH 101 Lecture 9
Thursday, January 17, 2019
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