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Ted Petit (310)
Lecture 5


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Ted Petit

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Human Brain and Behaviour Lecture 5 petitmal epilepsy - minor type of epilepsy - no true behavioral convulsions - characterized by rolling up of eyes (most common), twitch - loss of awareness - only last 5-20 seconds - 50-75% of the time, occurs by itself - can occur in grandmal - EEG 3 cycle per second activity sensory motor functions and dysfunctions visual system - anatomy of the retina is split down the middle - temporal portion of your retina near the outside of the head, nasal portion near the nose - retina is really part of your central nervous system - optic nerve - nerve that leaves the retina - the temporal nerves come together, cross then part - where the nerves touch - optic chiasm - the part of your retina from the temporal portion as it continues back, comes to the op- tic chiasm and does not cross - nasal portion of each retina, when they go toward the optic chiasm, cross and continue over to the opposite side of the brain - everything on the right visual field, will hit the nasal portion of the right eye and the temporal portion of the left eye (draw the diagram from 18:00 in lecture) - everything you see in your right visual field goes to your left cortex What happens when severing optic nerve 1. Normal - full visual field 2. Monocular blindness - severing of one optic nerve closest to eye 3. Bitemporal hemianopsia - severing the nerves that cross (optic chiasm) (nasal por- tion) - blindness outer half of visual field in each eye 4. Right nasal hemianopsia - tumor on temporal part of the right eye - blindness in vi- sion in the nasal portion of the right eye Human Brain and Behaviour Lecture 5 5. homonymous hemianopsia - severing of the right optic tract - blindness in the left of the eye (nasal portion of the right eye, temporal portion of the left eye) 6. Quadrantanopsia - severing the temporal nerves on the right eye - blindness in top left quadrant of the visual field 7. Macular sparing - all the way to the cortex and there is damage (right side) - blind- ness in left half of vision except for the center (sparing) - at the peripheral portion (retina) capable of detecting a spot of light falling on a single receptive field - area 17 of cortex (primary receptive area for vision) able to detect bars of light oriented in a particular orientation
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