106L10_notes - • • • • 1 Introduction to...

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Unformatted text preview: • • • • 1 Introduction to Neuroscience Lecture 10: Visual System I. Retinal Processing Reading Assignment: Bear et al., Ch. 9 CBNS 106 2 Introduction • Overview of the Visual System – Visual information is projected the following pathway: • Retina • Optic nerve • Optic chiasm • Optic tract • Lateral geniculate nucleus (LGN) • Visual radiations • Primary visual cortex • Higher visual cortex – The visual world is represented throughout the visual pathway in a map that basically is “upside down and backwards” • • • • 2 CBNS 106 3 Introduction • Significance of vision – Relationship between human eye & camera – Retina • Photoreceptors: Converts light energy into neural activity • Detects differences in intensity of light – Lateral geniculate nucleus (LGN) • First synaptic relay in the primary visual pathway • Visual information ascends to cortex interpreted and remembered CBNS 106 4 Properties of Light • Light – Light and electromagnetic radiation – Electromagnetic radiation • Wavelength, frequency, amplitude Hot colors: Orange, red; Cool colors: blue, violet • • • • 3 CBNS 106 5 Properties of Light • Optics – Study of light rays and their interactions • Reflection – Bouncing of light rays off a surface • Absorption – Transfer of light energy to a particle or surface • Refraction – Bending of light rays from one medium to another CBNS 106 6 The Structure of the Eye • Gross Anatomy of the Eye – Pupil: Opening where light enters the eye – Sclera: White of the eye – Iris: Gives color to eyes – Cornea: Glassy transparent external surface of the eye – Optic nerve: Bundle of axons from the retina • •...
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This note was uploaded on 04/15/2008 for the course CBNS 106 taught by Professor Korzus during the Winter '08 term at UC Riverside.

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106L10_notes - • • • • 1 Introduction to...

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