PSYCH101 Lecture Notes - Lecture 3: Retina, Bulimia Nervosa, Visual Cortex

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PSYCH101 Full Course Notes
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PSYCH101 Full Course Notes
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Frequency in sound: refers to wavelength, measured in hertz (hz), number of cycles a sound wave travels per second. Pitch: perceptual experience of sound wave frequencies. Pinna: outer region of ear that helps channel sound waves and allows you to determine source/location of a sound. Auditory canal: extends from pinna to eardrum. Middle ear consists of 3 tiny moveable bones called ossicles (hammer, anvil, stirrup) Ossicles attach to cochlea: fluid-filled membrane coiled in snail like shape/contains structures that convert sound into neural impulses. Sound localization: process of identifying where sound comes from, handled by midbrain structure called inferior colliculus. High frequency sounds stimulate hair cells closest to ossicles. Lower frequency sounds stimulate hair cells toward end of cochlea. Place theory of hearing: how we perceive pitch is based on location along basilar membrane that sound stimulates. Frequency theory: perception of pitch is related to frequency at which basilar membrane vibrates. Haptics: active, exploratory aspect of touch sensation and perception.

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