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Lecture 3 - 10.01.11

Lecture 3 - 10.01.11 - 10th January 2010 Psych 120B Lecture...

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10 th January 2010 Psych 120B – Lecture 3 Visual System: Anatomy and Physiology Introduction o Functional detail of visual pathways The eye The retina o Receptors o How does a receptor work Field of view and Visual Field o Fovea, periphery o Eccentricity and visual functions o Blind spot and filling in Dark adaptation Acuity-sensitivity trade-off Lecture notes for slides 2-4 Superior colliculus is responsible for orienting behaviour: movement of eyes, head, body. Light All electromagnetic radiation range: 10 -12 and 10 4 Visible light: 400-700 nm (1nm= 10 -9 ) Chance of seeing a frequency band selected at random is: 300/10 16 or about .00000000000003 Why do we see this particular tiny band of light? o It is the most intensely emitted by the sun. The Visual Pathway Optic nerves cross over at the optic chiasm. The receptors are in the retina and the neural pathways start at the optic nerve, where they leave the eye. The lateral geniculate nucleus is the relay station because it does not change information in any way The superior colliculus is the separate orienting system The visual cortex is the main system which detects patterns, objects, structure It used to be speculated that this was one whole system but it seems that there are two: One system: WHAT? o What am I looking at? Other system: WHERE? o Where things are in relation to each other, the spatial layout. Left world -> right half retina -> right brain Right world -> left half retina -> left brain What does it take to see? Important steps between World and Mind: o Light enters the eye and is absorbed by photopigment in receptors (“bleaching” of photoreceptors) o Chemical change brought about by light absorption triggers electrical signal in photoreceptor
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o Subsequent signals for vision are all electrical (neural) But….why does this carry information?
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Lecture 3 - 10.01.11 - 10th January 2010 Psych 120B Lecture...

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