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
Related in: MedlinePlus
Mentions: Four more examples are displayed in Fig. 2. The example shown in Fig. 2A demonstrates that the suppression was not always strongly influenced by the probe tone frequency. For both probe tones, the SCF and SBF are closer to the CF than to the probe tone frequency. There are, however, differences between the SRFs for the two probe tone frequencies. The 1.7-kHz (below CF) probe tone is less strongly suppressed by above CF tones than when the probe is at 3.4 kHz (above CF). In the example shown in Fig. 2B, there is only a subtle expansion of the tuning curve towards the probe frequency for a probe frequency below CF (Fig. 2B; 3-kHz probe), compared with when the probe tone frequency is closer to unit CF; whereas, when the probe is above CF (14 kHz) there is a clear shift in the SRF.
Affiliation: MRC Institute of Hearing Research, University Park, Nottingham NG7 2RD, UK.