11-15-11 Sound and the Auditory System Continued

11-15-11 Sound and the Auditory System Continued - peak in...

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PSY402 Sensation and Perception November 15, 2011 Sound and the Auditory System Continued Pathway from the cochlea to the cortex Auditory nerve fibers synapse in a series of subcortical structures o Cochlear nucleus o Superior olivary nucleus (in the brain) o Inferior colliculus (in the midbrain) o Medial geniculate nucleus (in the thalamus) o Auditory receiving area (A1 in the temporal lobe) Auditory areas in the cortex: o Neural signals: Core Belt Parabelt o Simple sounds cause activation in the core area o Belt and parabelt areas are activated in response to more complex stimuli made up of many frequencies o Representation of frequency in A1 o Link perception and physiological response in A1 o Primary auditory cortex has preferential response to frequency and to location of
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Unformatted text preview: peak in cochlea o Representation of pitch and complex sounds o Neurons outside A1 code pitch What and Where streams for hearing What , or ventral stream, o Responsible for identifying sounds Where , or dorsal stream, o Responsible for locating sounds Evidence from neural recordings, brain damage, and brain scanning Cochlear implants (bionic ear) Electrodes are inserted into the cochlea to electrically stimulate auditory nerve fibers o Microphone (1), sound processor (2), transmitter (3), receiver (4), electrode (5) o Implants stimulate the cochlea at different places on the tonotopic map according to specific frequencies in the stimulus...
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11-15-11 Sound and the Auditory System Continued - peak in...

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