Nervous System - Sensory

Olfaction the stimulus location here is unrelated to

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Unformatted text preview: Rods can again be bleached Can again see clearly via cones Convergence of photoreceptors Convergence: photoreceptors bipolar cells; bipolar cells ganglion cells More than one photoreceptor to bipolar neuron More than one bipolar cell to ganglion cell Rods converge more lower visual acuity, greater sensitivity One foveal cone one bipolar cell greater acuity, lower sensitivity Neural Pathways for Vision Parallel pathways transfer different types of visual information: color, shape, movement Coding is distinct all the way to the visual cortex Visual cortex integrates everything Ganglioinic cells Optic nerve Optic chiasm Optic tract LGB synapses Optic radiations Visual cortex synapses Right visual field to left cortex, and vice versa Binocular visual field 2 perspectives of visual field One from each eye Depth perception Brain can construct 3- D image Localization in Hearing and Olfaction The stimulus’ location here is unrelated to coding by the receptive fields; determine location by differential quality and intensity of smell, or pitch and loudness of sound, as timing of arrival of stimulus differs Hearing and Equilibrium: Anatomy of the Ear Auditory and equilibrium Most important part of middle ear: the three bones, stapes/incus/malleus The oval window vibrates, and the round window adapts in order to maintain pressure equilibrium The Eustachian tube: middle ear to pharynx Sound Amplification in the Middle Ear Sound waves strike tympanic membrane Movement of ossicles (lever system), first level amplification Movement of oval window, second level amplification The oval window is smaller than the tympanic membrane Sound Signal Transduction Conversion of sound energy to Aps occurs in the cochlea of the inner ear...
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