Forward suppression in the auditory cortex is frequency-specific.
Bottom Line: The temporal order and frequency proximity of sounds influence both their perception and neuronal responses.These effects are larger when the two sounds are spectrally similar.These data are consistent with the idea that cortical neurons receive convergent inputs with a wide range of tuning properties that can adapt independently.
Affiliation: MRC Institute of Hearing Research, University Park, Nottingham NG7 2RD, UK.Show MeSH
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Mentions: Figure 6 shows how the locus of suppression depends upon ISI for the population of units (for those conditions when tuning was well estimated, as in Figs 3 and 4). Across the population there was no significant relationship between ISI and the distance from either the SCF to the CF or the SBF to the BF (linear mixed model, P > 0.05). The relationship between the probe tone frequency and both the SCF (Fig. 6A; the black line shows the gradient of the regression line calculated in the same way as shown in Fig. 3A, for all ISIs) and the SBF (grey line) remained relatively constant as the ISI was increased. The tightness of these correlations was also relatively constant across time (the dashed lines in Fig. 6A show correlation coefficients for the regression line as shown in Fig. 3A, for all ISIs). This can also be observed in the distributions of the PFI measure, which are shown as box plots in Fig. 6B and C for the SCF and SBF, respectively.
Affiliation: MRC Institute of Hearing Research, University Park, Nottingham NG7 2RD, UK.