Tone-versus FM--induced patterns of excitation and suppression in the 14-C-2-deoxyglucose labeled auditory "cortex" of the guinea fowl.

Abstract:

:The primary auditory "cortex" field L, of the Guinea fowl is a three layer tonotopically organized structure. Isofrequency planes as shown with the 2-deoxyglucose (2DG) method cut across these layers and with their second dimension extend in rostro-caudal direction. The input layer L2 exhibits "spontaneous" labeling due to high spontaneous activity of input terminals and units throughout the hearing range. The labeling is stronger locally along a rostro-caudal isofrequency contour of L2 after tone or narrow band FM stimulation. With tone stimuli the layers L1 and L3 are labeled within an isofrequency plane except for the rostral half of the field whereas frequency modulated tones do label these two layers throughout the corresponding isofrequency plane. FM stimuli in addition lead to a reduction of spontaneous labeling in frequency planes adjacent to those which are covered by the stimuli. Since these effects correlate with known inhibitory effects of such stimuli it is argued that the 2 DG method can identify the suppression of activity of neurons in suitable structures.

journal_name

Exp Brain Res

authors

Scheich H,Bonke BA

doi

10.1007/BF00238839

subject

Has Abstract

pub_date

1981-01-01 00:00:00

pages

445-9

issue

4

eissn

0014-4819

issn

1432-1106

journal_volume

44

pub_type

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