Peri‐threshold encoding of stimulus frequency and intensity in the M100 latency
作者:
Steven Stufflebeam,
David Poeppel,
Howard Rowley,
Timothy L. Roberts,
期刊:
NeuroReport
(OVID Available online 1998)
卷期:
Volume 9,
issue 1
页码: 91-94
ISSN:0959-4965
年代: 1998
出版商: OVID
关键词: Auditory cortex;Functional imaging;Magnetoencephalography (MEG);Temporal coding;Tonotopy
数据来源: OVID
摘要:
RECENT work has suggested that, in addition to spatial tonotopy, pitch and timbre information may be encoded in the temporal activity of the auditory cortex. Specifically, the post-stimulus latency of the maximal cortical evoked neuromagnetic field (M100 or N1m) is a function of stimulus frequency. We investigated the additional effect of varying the stimulus intensity on the M100 response. A 37-channel biomagnetometer recorded neuromagnetic fields over the temporal lobe of healthy volunteers in response to monaurally presented tones. The frequency dependence of the M100 latency remained remarkably invariant even at low stimulus intensity. Thus, for peri-threshold stimuli, frequency information appears encoded in the temporal form of the evoked response.
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