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1. The posterior field (field P) of the cat's auditory cortex contains a higher proportion of neurons whose response/level functions for characteristic frequency (CF) tones are nonmonotonic than does the primary field (AI). The general purpose of the present study is to assess whether the response/level functions of field P neurons are generated by the same(More)
In seven barbiturate-anesthetized ferrets, we explored the acoustically sensitive cortex with conventional microelectrode mapping techniques. A tonotopically organized field was found whose orientation was such that high tonal frequencies were represented dorsally, and low frequencies ventrally. Within this field, neurons typically had short (12-20 ms)(More)
The tonotopicity of the cat's primary auditory cortex (AI) is thought to provide the framework for frequency-specific processing in that field. This study was designed to assess this postulate by examining the spatial distribution of neurons within AI that are activated by a single tonal frequency delivered to the contralateral ear. Distributions obtained(More)
OBJECTIVE Word recognition performance in continuous and interrupted broadband noise was examined in young normal-hearing (YNH), older normal-hearing (ONH), and presbyacusic (older hearing-impaired [OHI]) listeners. DESIGN Participants (N = 36) were presented with identical Northwestern University Auditory Test No. 6 stimuli at 30 dB sensation level re(More)
In the primary auditory cortex of cats anaesthetized with nitrous oxide, single neurones were examined with respect to their responses to tone bursts and linear modulations of the frequency of an on-going continuous tone. Using FM ramps of 2.0 kHz excursion and varying centre frequency, each of 39 neurones was examined for its preference for the direction(More)
In the cortex of barbiturate-anesthetized cats, area AI was identified by its tonotopic organization, and single neurons in that field were examined with regard to the shapes of their spike count-versus-intensity functions, the organization of their frequency-intensity response areas, and their responses to wide-spectrum noise, using calibrated sealed(More)
Microelectrode recording studies were made of the crown of the ectosylvian auditory cortex of barbiturate-anesthetized ferrets, using calibrated, sealed acoustic stimulus delivery systems. We confirmed our previous finding using free-field stimuli that this region of the ferret's cerebral cortex contains a tonotopically organized field in which neurons are(More)
In 15 cats, cortical area AI was defined by its frequency organization, and cells within that field were tested for sensitivity to interaural intensity differences (IIDs) using sealed stimulus delivery systems. Of 39 cells tested quantitatively, 26 were sensitive to IIDs. In 70% of cases, sensitivity to IIDs reflected suppressive binaural interactions, and(More)
This report presents preliminary evidence on the effect of continuous tonal maskers on the responses of single primary auditory cortical neurons in anesthetized cats to tonal signals across their effective frequency ranges 10 dB above characteristic frequency threshold. Tonal maskers had three kinds of effects. In many cells, the masker produced a(More)