NROC64H3 Chapter Notes - Chapter 9: Retina Horizontal Cell, Transducin, Lightdark
17 Mar 2012
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Vision: detect things , sensitivity to light allows us to see things. Retina: contains photoreceptors to convert light energy neural activity, rest of eye forms crisp images. Made to detect differences n intensity of light falling on different parts of it. 1st relay in pathway that serves visual perception occurs in cell group of dorsal thalamus called the lateral geniculate nucleus lgn. Lgn visual info ascends to cerebral cortex for interpretation and remembering. Light is electromagnetic radiation that is visible to our eyes. Electromagnetic radiation has wavelength (distance b/w successive peaks/troughs), frequency (number of waves per second), amplitude. Radiation w/ high frequency (short wavelengths as hihest energy content. Reflection: bouncing of light rays off surface. Absorption: transfer of light energy to particle or surface. Refraction: imagies formed on eye this way, bending of light rays that can occur when they travel form 1 transparent medium to another (i. e. ray of light passing through air or water)
