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2012 | 72 | 1 |

Tytuł artykułu

P50 potential-associated gamma band activity: Modulation by distraction

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
We aimed to evaluate the effect of changing attentional demands towards stimulation in healthy subjects on P50 potential- related high-frequency beta and gamma oscillatory responses, P50 and N100 peak amplitudes and their gating measures. There are no data showing effect of attention on P50 potential-related beta and gamma oscillatory responses and previous results of attention effects on P50 and N100 amplitudes and gating measures are inconclusive. Nevertheless the variation in the level of attention may be a source of variance in the recordings as well as it may provide additional information about the pathology under study. Nine healthy volunteers participated in the study. A standard paired stimuli auditory P50 potential paradigm was applied. Four stimulation conditions were selected: focused attention (stimuli pair counting), unfocused attention (sitting with open eyes), easy distraction (reading a magazine article), and difficult distraction (searching for Landolt rings with appropriate gap orientation). Time-frequency responses to both S1 and S2 were evaluated in slow beta (13-16 Hz, 45-175 ms window); fast beta (20-30 Hz, 45-105 ms window) and gamma (32-46 Hz, 45-65 ms window) ranges. P50 and N100 peak amplitudes in response to both S1 and S2 and their ratio were evaluated. The phase-locked P50 potential-associated gamma activity was attenuated during distraction tasks as compared to focused attention and an unfocused attention condition. The amplitudes and gating measures of P50 and N100 waves and beta activity were not sensitive to the competing distraction task performance. The use of a distraction task is not favorable when phase-locked gamma range activity is a key interest in auditory potential studies.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

72

Numer

1

Opis fizyczny

p.102-109,fig.,ref.

Twórcy

  • Department of Electrophysiological Treatment and Investigation Methods, Vilnius Republican Psychiatric Hospital, Vilnius, Lithuania
  • Department of Psychology, Mykolas Romeris University, Vilnius, Lithuania
autor
  • Department of Biochemistry-Biophysics, Vilnius University, Vilnius, Lithuania
autor
  • Department of Electrophysiological Treatment and Investigation Methods, Vilnius Republican Psychiatric Hospital, Vilnius, Lithuania
  • Department of Biochemistry-Biophysics, Vilnius University, Vilnius, Lithuania
autor
  • Department of Electrophysiological Treatment and Investigation Methods, Vilnius Republican Psychiatric Hospital, Vilnius, Lithuania
  • Psychiatric Center Ballerup, University Hospital of Copenhagen, Copenhagen, Denmark

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