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Re: N1 enhancement for Cue-Probe Pairs

Dear Katrin,

are you interested in the N1 component of the peripheral compound action potential, or in the N100 component of the EEG/MEG?

In either case, I reviewed studies examining the effects of a forward masker on physiological responses to a target tone in my doctoral dissertation concerned with loudness enhancement and intensity resolution under non-simultaneous masking (http://nbn-resolving.de/urn:nbn:de:kobv:83-opus-10616) . You will find the discussion of these studies on pp. 56ff (Chapter 4.2.2).

There is no evidence for enhancement at early processing stages (CAP, auditory brainstem response). For the N100 (EEG) or N100m (MEG), several authors reported an enhancement of the response to the second tone in a pair of two tones at ISIs smaller than 300 ms. However, in all of these studies, the first tone (masker/cue tone) and the second tone (target/probe) were presented at the same intensity. Therefore, this physiological enhancement is not reflecting loudness enhancement [Oberfeld, J. Acoust. Soc. Am. 121, 2137–2148 (2007)]), which occurs only for maskers/cues higher in level than the target.

Kind regards,

Daniel

Date:    Thu, 6 Dec 2007 17:14:29 -0000
From:    Katrin Krumbholz <katrin@xxxxxxxxxxxxx>
Subject: N1 enhancement for Cue-Probe Pairs

Dear All,
I am looking for references on the enhancement that has been observed in
some studies of the N1 response to a Probe tone following a Cue tone in a
C-T paradigm. I remember reading about it in a review article, but I cannot
remember which one it was or what the original data was. I seem to remember
that enhancement (as opposed to suppression) occurs for small Cue-Probe
intervals (300-500 ms). Can anybody point me to the appropriate references?
Many thanks in advance!
Best wishes, Katrin



--
Dr. Daniel Oberfeld-Twistel
Johannes Gutenberg - Universitaet Mainz
Department of Psychology
Experimental Psychology

Staudingerweg 9
55128 Mainz
Germany

Phone ++49 (0) 6131 39 22423
Fax   ++49 (0) 6131 39 22480
http://www.staff.uni-mainz.de/oberfeld/