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J Neurosci Methods. 2015 Jul 15;249:50-8. doi: 10.1016/j.jneumeth.2015.04.003. Epub 2015 Apr 8.

A setup for simultaneous measurement of electrophysiological and psychometric temporal encoding in the auditory system.

Author information

1
University of Würzburg, Clinic for Otolaryngology, Comprehensive Hearing Center, 97080 Würzburg, Germany. Electronic address: Bahmer_A@ukw.de.
2
University of Frankfurt Main, Clinic for Otolaryngology, Audiological Acoustics, 60590 Frankfurt, Germany. Electronic address: uwe.baumann@kgu.de.

Abstract

BACKGROUND:

Simultaneous assessment of psychometric tasks and electrophysiological recordings is challenging because each requires specific technical and physiological preconditions. Electrophysiological recordings require a comparatively long test time duration to gain sufficient signal-to-noise ratios, whereas test duration of psychometric measurements should be limited to prevent challenges to the attention of the subject. In order to investigate immediate correlation between both measurements a method is described, which combines electrophysiological and psychometrical measurements in a single test procedure. The test may be applied to subjects with deficits in temporal resolution (e.g. auditory neuropathy spectrum disorder, ANSD).

NEW METHOD:

Auditory steady state responses (ASSR) and a pitch discrimination task were combined in a single procedure. The setup employed two short-time ASSR sub-stimuli with different fixed modulation frequencies but same carrier frequencies (signal 1 and 2). Simultaneously to the recording of ASSR, the test subject had to determine the signal interval which generated the perception of higher pitch.

RESULTS:

The developed setup was successfully tested by means of an artificial EEG signal and in one human subject. ASSR signal as well as pitch discrimination performance.

COMPARISON WITH EXISTING METHODS:

To our knowledge the presented method has not yet been described elsewhere.

CONCLUSIONS:

The feasibility of a setup to simultaneously perform a pitch discrimination task and electrophysiological measurements was demonstrated for the first time. The method provides the facility to apply sinusoidal amplitude modulated stimuli (SAM) with jittered modulation period lengths.

KEYWORDS:

ASSR; Electrophysiology; Jitter; Psychophysic; SAM; Temporal coding

PMID:
25863139
DOI:
10.1016/j.jneumeth.2015.04.003
[Indexed for MEDLINE]

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