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Auditory mapping in the cortex - Coggle Diagram
Auditory mapping in the cortex
methods for mapping
non invasive
EEG / MEG
fMRI
invasive
single cell recording
histochemical methods - staining and stuff
basic concept:
auditory core - primary (like) fields
primary auditory (AI)
high freq caudally - low freq rostrally
densely interconnected
strong histochemical resemblance
rostral field (R)
reverse tonotopic organisation
dense interconnections
rostro-temporal field (RT)
responsive to pure tones
tonotopic organization reverse to R
koniocortex (AI and R) - "powder" like
parallel processing? - same information (from same thalamic neuron) relayed to all three areas in parallel
function not identical but overlap - functions of auditory cortex are preserved after a lesion to any one area
surrounding belt - fields at second level of processing
rostromedial area (RM)
major connections with R
projections to parabelt cortex
narrow, densely interconnected with adjacent core areas, architectonic features between primary cortex and lateral
homotypical cortex (?)
CL
lateral field (L)
middle lateral (ML)
anterior lateral (AL)
CM
tuned more broadly than AI
following lesions of AI led to reduced response in CM - second level cortical processing
neurons tuned to pure tones tuned to high freq
parabelt areas
Formisano - functional mapping of auditory cortex using fMRI
silent event-related paradigm
Petkov - fMRI of macaque auditory areas
preference for band-passed noise over pure tones in auditory belt
consistent with hierarchical processing
11 core and belt areas