Adaptation in the Dorsal Belt and Core Regions of the Auditory Cortex in the Awake Rat.
Neuroscience
; 455: 79-88, 2021 02 10.
Article
en En
| MEDLINE
| ID: mdl-33285236
ABSTRACT
The rat auditory cortex is divided anatomically into several areas, but little is known about the functional differences in information processing among these areas. Three tonotopically organized core fields, namely, the primary (A1), anterior (AAF), and ventral (VAF) auditory fields, as well as one non-tonotopically organized belt field, the dorsal belt (DB), were identified based on their response properties. Compared to neurons in A1, AAF and VAF, units in the DB exhibited little or no response to pure tones but strong responses to white noise. The few DB neurons responded to pure tones with thresholds greater than 60â¯dB SPL, which was significantly higher than the thresholds of neurons in the core regions. In response to white noise, units in DB showed significantly longer latency and lower peak response, as well as longer response duration, than those in the core regions. Responses to repeated white noise were also examined. In contrast to neurons in A1, AAF and VAF, DB neurons could not follow repeated stimulation at a 300â¯ms inter-stimulus interval (ISI) and showed a significant steeper ISI tuning curve slope when the ISI was increased from 300â¯ms to 4.8â¯s. These results indicate that the DB processes auditory information on broader spectral and longer temporal scales than the core regions, reflecting a distinct role in the hierarchical cortical pathway.
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1
Bases de datos:
MEDLINE
Asunto principal:
Corteza Auditiva
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Vías Auditivas
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Estimulación Acústica
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Mapeo Encefálico
Idioma:
En
Revista:
Neuroscience
Año:
2021
Tipo del documento:
Article