Current functional models of the primary auditory cortex [25,27] suggest that the information extracted from the acoustic signal by the brainstem and thalamic processing stages is represented at the cortical level as clusters of spectral and harmonic patterns across a range of time scales, often referred to as spectrotemporal receptive fields (STRFs).
The involvement of multiple cortical areas is consistent with Musiek and Pinheiro's hypothesis that good performance on this task requires not only the effective processing of frequency at the level of the cochlea and the brainstem but also the faithful transmission of this information to the primary auditory cortex for coding as a series of discrete auditory objects with unique frequency content .
Primary auditory cortex of cats: feature detection or something else?
In 1989, Knight et al showed that unilateral prefrontal lesions increase the amplitude of middle-latency auditory evoked potentials, suggesting that the prefrontal cortex exerts an early inhibitory modulation of input to the primary auditory cortex
A more recent analysis of 142 children, which includes children studied by Eckert and Lombardino (Leonard, in preparation), identified additional anatomical risk factors for comprehension -- the size of Heschl's first gyrus, the site of primary auditory cortex
, and reduced leftward asymmetry of the planum.
The right-sided unilateral tinnitus was likely caused by an acute hemorrhage of a small cavernous angioma that was located adjacent to the contralateral primary auditory cortex
The primary auditory cortex is a known site of neuronal plasticity, meaning that it undergoes structural and functional changes in response to sensory input from the environment.
We have shown that motherhood is associated with a rapid and robust appearance of olfactory-auditory integration in the primary auditory cortex co-occurring with stimulus specific plasticity to pup distress calls," concludes Dr.
Activation levels during passive stimulation were measured within two regions of the brain: the primary auditory cortex
(A1) and superior temporal gyrus (STG), a region associated with sentence comprehension.
They also found that the shape of an area known as the left transverse gyrus, which includes the left primary auditory cortex
, differed in phoneticians compared to the lay public, but that its shape and size did not correlate with the amount of training a phonetician had undergone.