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Ted Petit (310)


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University of Toronto Scarborough
Ted Petit

Lecture 5, October 18.2010 Chapters 5 and 6 Sensory and motor systems:  Motor system: resides in the frontal cortex  Anatomy of the visual system and how its organized: everything begins in the retina which part of the CNS(it’s a part of the brain) o The retina grows out of the brain, it grows away from the brain and it a part of it o Retina: divided right down the middle, the part that is closest to the nose is the nasal portion. Slice the retina in half, the half that is closest to the nose is the RETINAL portion and the other half, that is closer to the side of the head is the TEMPORAL portion o Optic tract: leads to the brain o Nerve: to the pathway to the finger, the nerves that go to the brain aren’t called nerves anymore, they’re called a TRACT even though they are the same fibres o The whole visual system is a part of the CNS o The parts leaving the eye is the OPTIC NERVE, the nerves coming out of the eyes have a cross over and continue back to the brain the cross over point is called the OPTIC CHIASM, and as it moves back towards the brain it’s called the OPTIC TRACT o The temporal part (outside half) of the retina continues to the back of the brain, it comes to the optic chiasm and keeps going back staying on the same side of the rain meaning it does not cross. The nasal part of the retina (inside half) cross sides as they go to the optic chiasm: the left goes to the right and the right goes to the left o If you wiggle the fingers on your right hand o Something in your right visual field will hit nasal side of your right eye and hit the temporal portion of the left eye (ques on this on the midterm – draw diagram) o Something in your left visual field will hit the nasal portion of your left eye and hit the temporal portion of your right eye (ques on this on the midterm – draw diagram) o Something in the right visual field gets crossed to the left cortex of the brain (LOOK AT DRAWING) @20:10 o Everything in the left visual field goes to the right side of the brain PSYB65, LEC5. 1 o What you see when you look out, if your eyes are focused on him is the VISUAL FIELD  Everything to the right of him is the right visual half-field  Everything to the left of him is the left visual half-field  Visual field= what the person sees, and then what goes into the brain is different o Slide : the right hand side is the map of the visual field NOT what is dead in the retina  1: is normal  2: monocular blindness (its named after what you can see in the visual field, not what part of the eye that is dead) o 3: if you cut through the optic chiasm: the left eye can’t see the left visual field (the nasal part of the left eye is dead o If the sides on the right side were of the retina, then they will be the total opposite o If you get complete damage to the occipital cortexmassive stroke in the posterior cerebral artery  and it kills the whole occipital cortex and it leads to almost complete blindness o If you get incomplete damage/massive stroke on right side of occipital cortex you get incomplete blindness in the opposite visual field (left visual field) o Number 7:not perfect vision, MACULAR sparing: you’ll still be able to see, but you see a little spot PSYB65, LEC5. 2 o The retina is the first entry point a spot of light that hits the receptive part in the retina o Area 17: they take the info from the neurons in the retina and perceive the sensory information. Neurons respo
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