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Titolo:
FREQUENCY RESOLUTION AND SPECTRAL INTEGRATION (CRITICAL BAND ANALYSIS) IN SINGLE UNITS OF THE CAT PRIMARY AUDITORY-CORTEX
Autore:
EHRET G; SCHREINER CE;
Indirizzi:
UNIV ULM,ABT VERGLEICHENDE NEUROBIOL D-89069 ULM GERMANY UNIV CALIF SAN FRANCISCO,COLEMAN LAB,KECK CTR INTEGRAT NEUROSCI SAN FRANCISCO CA 94143
Titolo Testata:
Journal of comparative physiology. A, Sensory, neural, and behavioral physiology
fascicolo: 6, volume: 181, anno: 1997,
pagine: 635 - 650
SICI:
0340-7594(1997)181:6<635:FRASI(>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTIPLE-NEURON RECORDINGS; RESPONSE-SPECIFIC BANDS; CRITICAL BANDWIDTH; CONTINUOUS NOISE; CRITICAL RATIOS; MASKING; REPRESENTATION; TOPOGRAPHY; FILTER; NERVE;
Keywords:
AUDITORY CORTEX; BRAIN MAPPING; CRITICAL BANDWIDTH; FREQUENCY RESOLUTION; NOISE MASKING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
66
Recensione:
Indirizzi per estratti:
Citazione:
G. Ehret e C.E. Schreiner, "FREQUENCY RESOLUTION AND SPECTRAL INTEGRATION (CRITICAL BAND ANALYSIS) IN SINGLE UNITS OF THE CAT PRIMARY AUDITORY-CORTEX", Journal of comparative physiology. A, Sensory, neural, and behavioral physiology, 181(6), 1997, pp. 635-650

Abstract

Frequency resolution and spectral filtering in the cat primary auditory cortex (AI) were mapped by extracellular recordings of tone responses in white noise of various bandwidths. Single-tone excitatory tuningcurves, critical bandwidths, and critical ratios were determined as afunction of neuronal characteristic frequency and tone level. Single-tone excitatory tuning curves are inadequate measures of frequency resolution and spectral filtering in the AI, because their shapes (in most neurons) deviated substantially from the shapes of ''tuning curves for complex sound analysis'', the cut-yes determined by the band limitsof the critical bandwidths. Perceptual characteristics of spectral filtering (intensity independence and frequency dependence) were found in average critical bandwidths of neurons from the central and ventral AI. The highest frequency resolution (smallest critical bandwidths) reached by neurons in the central and ventral AI equaled the psychophysical frequency resolution. The dorsal AI is special, since most neuronsthere had response properties incompatible with psychophysical features of frequency resolution. Perceptual characteristics of critical ratios were not found in the average neuronal responses in any area of the AI. It seems that spectral integration in the way proposed to be thebasis for the perception of tones in noise is not present at the level of the AI.

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Documento generato il 04/12/20 alle ore 19:59:10