PSYC 1100 Lecture Notes - Lecture 19: Basilar Membrane, Auditory Cortex, Two-Streams Hypothesis

• School: UConn
• Department: Psychological Sciences
• Course: PSYC 1100
• Professor: Harvey Swadlow

Document Summary

By the amplitude of vibration in the basilar membrane. This determines how hard the hair cells are pulled. Von helmholtz: place theory, based on resonance- different parts of basilar membrane vibrate at different frequencies. Von bekesy: validated the place theory, but said its not based on resonance (only works for 50 hertz and higher, under 50 hertz the whole membrane vibrates together) Auditory nerves carry information from hair cells into brain stem. Multisynaptic pathway leads to dorsal thalamus and to auditory cortex. Auditory cortex has topographic map of stimulus frequency and intensity. Perception-- extraction of meaning from sensory input (not spots, lines, edges, or wavelengths) What is it? (recognizing objects): ventral stream of visual cortex. Where is it? (recognizing location of objects): dorsal stream of visual cortex. Keeping the world constant with changing sensations. Structuralists say yes: used introspection to analyze perceptions into basic sensations.