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Lecture 5

PSYB65- Lecture 5.docx

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University of Toronto Scarborough
Ted Petit

PSYB65 Lecture 5Sensory systemsRetinas are divided anatomically right down the middle a visual field is what a person can see visual fields are split into two halffields of left and right consists of nasal portion of retina is the half that is closest to ones nose and the other portion of the retina that is to the outside of the head are referred to as the temporal portion the nerves are divided exactly at the middle of the eye the two separate nerves leaving your eyes are referred to as the optic nervesthe point at which they come together is referred to as the optic chiasm they separate apart again and head towards the brain which is referred to as the optic tract the nasal portion of the retina crosses while the temporal potions stay on the same side when heading back to the left and right cortex something in your right visual field crosses over to the left cortex and everything in your left visual field goes to your right cortex macular sparing refers to the little bit in the center that you can see when the damage is near the cortexThe more central the neuron associational vs primary the more advanced the area of the brain the more complex is the image that excites it the more complex images excite it for example in the retina a neuron respond to a spot of light falling on its receptive field by the time you get to area 17lines of light oriented in a specific directionwhen you get to associational cortex these neurons integrate information from other neurons and it responds to complex images like a face handComplete damage to the right occipital cortex major stroke you will get complete blindness in the left visual field except for the tiny lit
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