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11:30 - 12:00 5 February 2014

External Seminar: Sensitivity in the human auditory cortex to localization cues in the amplitude envelope

Location

Gatsby Centre | Alexandra House (link Map)
17-19 Queen square | London | WC1N 3AR | United Kingdom

Open to: Academic

Speaker information

Nelli Salminen

The dominant cue in human sound source localization is the interaural time difference (ITD) extracted from the fine-structure of low-frequency sounds. However, ITD can also be detected in higher sound frequencies provided that the sounds are amplitude modulated at a suitable rate. We performed an MEG experiment to find out whether neurons in the human auditory cortex are sensitive to ITD in the amplitude envelope. Using an adaptation paradigm, we found selectivity to ITD in amplitude envelope within a range of delays useful for sound source localization. There was also a general preference for sounds that were out of phase in the two ears over those that were in phase. The ITD sensitivity occurred for amplitude modulation rates that have previously been identified as those in which human listeners can detect envelope-ITD. Some aspects of the neural sensitivity measured in MEG also correlated with ITD detection thresholds.


Contact

Bjorn Christianson
g.christianson@ucl.ac.uk