L33 Psych 100B Lecture Notes - Lecture 12: Trichromacy, Occipital Lobe, Visual Cortex
27 Sep 2017
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The eye: cornea: where light enters the eye, pupil: opening through which light passes, pupilometry - study of the size of the pupil in response to stimuli. Roles of the eye: gather light energy, adequate stimulus: type of energy for which a receptor is most responsive, transduce (transform) it into neural firing, send the messages to the brain. Properties of light: wavelength: distance from the peak of one wave to the next, different wavelengths = different colors, amplitude: the amount of energy in the light wave, different amplitudes = different brightness, transduction: photoreceptors in the retina. Location in retina periphery center (near fovea) high low high. Visual transduction: photochemicals in rods and cones respond to light, action potential! Ion channels open: electrochemical signal passes to optic nerve, travels to occipital lobe (brief stop in thalamus, processed in visual cortex. Interposition: objects blocking view = closer closer together.
