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• W2079597968 startingPage "5904" @default.
• W2079597968 abstract "Amplitude modulations are fundamental features of natural signals, including human speech and nonhuman primate vocalizations. Because natural signals frequently occur in the context of other competing signals, we used a forward-masking paradigm to investigate how the modulation context of a prior signal affects cortical responses to subsequent modulated sounds. Psychophysical modulation masking, in which the presentation of a modulated masker signal elevates the threshold for detecting the modulation of a subsequent stimulus, has been interpreted as evidence of a central modulation filterbank and modeled accordingly. Whether cortical modulation tuning is compatible with such models remains unknown. By recording responses to pairs of sinusoidally amplitude modulated (SAM) tones in the auditory cortex of awake squirrel monkeys, we show that the prior presentation of the SAM masker elicited persistent and tuned suppression of the firing rate to subsequent SAM signals. Population averages of these effects are compatible with adaptation in broadly tuned modulation channels. In contrast, modulation context had little effect on the synchrony of the cortical representation of the second SAM stimuli and the tuning of such effects did not match that observed for firing rate. Our results suggest that, although the temporal representation of modulated signals is more robust to changes in stimulus context than representations based on average firing rate, this representation is not fully exploited and psychophysical modulation masking more closely mirrors physiological rate suppression and that rate tuning for a given stimulus feature in a given neuron's signal pathway appears sufficient to engender context-sensitive cortical adaptation." @default.
• W2079597968 created "2016-06-24" @default.
• W2079597968 creator A5005491724 @default.
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• W2079597968 date "2015-04-15" @default.
• W2079597968 modified "2023-09-26" @default.
• W2079597968 title "Modulation-Frequency-Specific Adaptation in Awake Auditory Cortex" @default.
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• W2079597968 doi "https://doi.org/10.1523/jneurosci.4833-14.2015" @default.
• W2079597968 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4397592" @default.
• W2079597968 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25878263" @default.
• W2079597968 hasPublicationYear "2015" @default.
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