PSYC 1101 Lecture Notes - Lecture 3: Retina, Hair Cell, Middle Ear
20 Oct 2017
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Document Summary
Sensation: the feeling itself and activated by environmental stimuli. Perception: awareness of feeling; organizing and interpreting sensory input. Receptors: activated by particular stimuli in environment and are attached to neurons. Transduction: conversion of one form of energy to another. Absolute threshold: minimum stimulation needed to detect a particular stimulus. Difference threshold: minimum difference a person can detect between any two stimuli. Sensory adaptation/habituation: diminished sensitivity as a consequence of constant stimulation. Bottom up processing: sensory analysis that begins at the entry level. Information flowing from the sensory receptors to the brain. Top down processing: information processing guided by high level mental processes. Construct perceptions by filtering information through our experience and expectations. Many receptors in the fovea and retina. Ganglion axons forming the optic nerve -> thalamus -> synapse with neurons -> visual cortex. Nerve cells in the brain respond to specific visual features of the environment. Iris: controls size of pupil; dilate and constrict in response to light intensity.
