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Critical periods in human visual system

QuestionAnswer
What is Strabismus? Crossed eyes - lack of muscle coordination so that two eyes do not line up correctly. Many times in congenital.
How are eye movements controlled? There are six pairs of extraocular muscles which control all eye movements.
Describe what happens when a person has a gaze malalignment? Two eyes cannot focus on the same point in visual field simultaneously. Often congenital, may be constant or intermittent.
What are some treatments for gaze malalignments? Vision therapy, prism glasses, patching of one eye, muscle surgery.
What are the four different gaze malalignments? Esotropia, exotropia, hypertropia, hypotropia
In the Competition Hypothesis, what is monocular deprivation? Loss of active competition to control cortical cells, retraction of axon terminals from closed eye, no pruning from open eye.
In the Competition Hypothesis, what is binocular deprivation? Neither eye has an advantage over the other, and spontaneous firing even in dark must be sufficient to help define and maintain columns.
Describe the process of binocular vision and what can happen if this is interrupted. Dependent on spatial and temporal overlap of input from both eyes. If interrupted, some will suppress input from 1 eye to avoid double vision, leading to amblyopia.
What is double vision? The simultaneous perception of two images, usually overlapping, of a single scene or object.
What is amblyopia? Blindness in one eye
What are the key components of all sensory systems? Stimulus energy in environment -> sensory -> receptor cells -> pathway that carries info to brain -> thalamic relay -> primary cortical region
Created by: cassidylm34
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