PSYC 108 Lecture Notes - Lecture 14: Speech Perception, Phenome, Receptive Aphasia
Document Summary
Sound = vibration through air: 20-20,000hz is our range, we see it as a function of pressure vs. time, frequency and amplitude. Located in superior temporal lobe: tonotopically arranged, then secondary auditory cortex, called belt/para-belt regions, these higher level cortical regions are around the primary cortex. Inter-aural differences (difference of sound reaching each ear: we use, difference in time to each ear, difference in intensity to each ear, vertical plane, distortion of head/pinna. Left hemisphere damage = damage to left hemisphere and can"t hear words, but all other sounds: categorical perception, we perceive speech in categories. "da" is one phenome and "ta" is another. There is no in-between even though they can be mapped continuously. Loops: ventral loop, used for semantic processing. "what: dorsal loop, connects parietal to frontal lobes using the arcuate fasciculus, phonological loop, ordering of auditory information, we repeat auditory information to ourselves here, motor theory of speech perception.
