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PSYB65H3 (519)


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Zachariah Campbell

Sensory and Motor Systems and parkinsons visual system half of each retina is wired differently from the other half the outside portion continue on to occipital cortex of same side of body the inside portion of each retina cross and go to contralateral occipital cortex before optic chiasm called optic nerve, after called optic tract anything in right visual field hits left side of retina draw diagram on exam to figure it out on exam everything in right visual field ultimately ends up in left visual cortex keep in mind both the anatomy and the level of processing in retina, primary and associational the closer u get to associational cortex, the more complex the function will be in retina, neurons respond to a spot of light falling on a receptive field by area 17, primary cortex: respond to lines oriented in a certain direction then associational responds to is very complex shapes like faces and hands damage patients visual field is represented in diagram NOT THE RETINA, what they can see blackness represents blindness we test the eyes ONE AT A TIME squiggly line in #1 is what normal vision can see in visual field damage to optic nerve is equivalent to damage to retina cuz u have damaged the output #2 damage to right optic nerve: monocular blindness #3 optic chiasm damaged: it is the nasal part of each retina that crosses, the nasal portion of retina sees the periphery, therefore u become blind to periphery in each visual field (remember black portion shows blindness) #4 easy #5 damage to right optic tract: left visual field gone cuz lands on right cortex #7 has centre part of vision called macular sparing, something to do with crossing over of fibres complete damage to occipital cortex, virtual compete blindness in opposite visual field partial=partial even in complete blindness, there is some sparing of vision, in central portion of visual field scotoma- very small dot of blindness caused by small cortical damage, usually not noticed cuz brain makes up for it we all have a natural occurring scotoma once in associational cortex loss of visual patterns, hands, etc particularly if damage is on right hand side damage on left would be more recognition associated with speech, reading, writing visual agnosias also sometimes referred to as perceptual disorders primary symptom person can see object but not recognise it, name it or use it properly usually involved damage to left occipital 2 very specific: prosopagnosia: an inability to recognise faces, also sometimes complex stimuli g
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