NEUROSCI 101 Lecture Notes - Lecture 12: David H. Hubel, Lightdark, Parallel Computing
25 Feb 2016
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Illusion: stare at black dot in center of fading field, and the peripheral fading field begins to disappear. Probably rods involved: foveal vision maintains the black center (cones, periphery disappears: rods are here. Need to move eyes around to see entire environment. Receptors: light induces less graded potentials (less ipsps) Light cornea central area (pupil) lens (focuses light image) retina (rods/cones) Retina: contains rods/cones, receives focused light: blind spot: no rods/cones where the optic nerve attaches. Brain utilizes context to fill in blind spot so we do not perceive it. Optic nerve: connects to retina, made of many neurons, no rods/cones where it exits through retina. Rods and cones face away from the light. On the outermost periphery of the retina. Connect toward the front to the bipolar cells. Connect toward the front to the ganglion cells. Ganglion cell axons make up the optic nerve.
