Distraction task rather than focal attention modulates gamma activity associated with auditory steady-state responses (ASSRs)
I Griskova-Bulanova, O Ruksenas, K Dapsys… - Clinical …, 2011 - Elsevier
I Griskova-Bulanova, O Ruksenas, K Dapsys, V Maciulis, SMH Arnfred
Clinical Neurophysiology, 2011•ElsevierOBJECTIVE: To explore the modulation of auditory steady-state response (ASSR) by
experimental tasks, differing in attentional focus and arousal level. METHODS: 20Hz and
40Hz click trains were used to elicit ASSRs. Experiment 1 consisted of two runs of closed
eyes and two runs of open eyes. Experiment 2 consisted of six tasks: counting 20Hz and
40Hz stimuli, sitting with closed and open eyes, reading an article, and performing a search
task. Phase locking factor, evoked amplitude and total intensity were decomposed by non …
experimental tasks, differing in attentional focus and arousal level. METHODS: 20Hz and
40Hz click trains were used to elicit ASSRs. Experiment 1 consisted of two runs of closed
eyes and two runs of open eyes. Experiment 2 consisted of six tasks: counting 20Hz and
40Hz stimuli, sitting with closed and open eyes, reading an article, and performing a search
task. Phase locking factor, evoked amplitude and total intensity were decomposed by non …
OBJECTIVE
To explore the modulation of auditory steady-state response (ASSR) by experimental tasks, differing in attentional focus and arousal level.
METHODS
20Hz and 40Hz click trains were used to elicit ASSRs. Experiment 1 consisted of two runs of closed eyes and two runs of open eyes. Experiment 2 consisted of six tasks: counting 20Hz and 40Hz stimuli, sitting with closed and open eyes, reading an article, and performing a search task. Phase locking factor, evoked amplitude and total intensity were decomposed by non-negative multi-way factorization.
RESULTS
The total intensity of 40Hz ASSR was enhanced during closed eyes condition in comparison to the open eyes condition. The evoked amplitude and phase locking factor of 40Hz ASSR were attenuated during distraction, while there were no differences between attention to stimulation and no task. 20Hz ASSR and 20Hz ASSR-related 40Hz activity were not modulated by the tasks.
CONCLUSIONS
The phase-locked measures of 40Hz ASSR are attenuated when attention to the stimulation is low, i.e. the subject is effortfully focused on the competitive “distraction” task performance. Lower arousal level increases the total intensity of 40Hz ASSRs.
SIGNIFICANCE
Improvements of the practical use of ASSRs are suggested: a careful monitoring for arousal fluctuations during ASSR recordings should be performed; when ASSRs are applied to investigate the ability to generate high frequency cortical activity a “distraction” task is not favorable.
Elsevier
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