Impulsivity, anxiety, and individual differences in evoked and induced brain oscillations.

Full Abstract

There is much evidence to confirm the view that slow waves of delta and theta ranges are linked to activation whereas alpha oscillations are somehow related to inhibition processes. In the domain of individual differences, impulsive behavior is frequently associated with increased spectral power of slow oscillations whereas Behavioral Inhibition (BI) may be associated with higher reactivity within alpha band. Here it is hypothesized that Impulsivity would predispose to higher responding in low frequencies whereas BI would predispose to higher responding within alpha band. In a sample of 51 subjects, evoked and induced responses to auditory stimuli were studied in two experimental sessions:
1) in a simple discrimination task and 2) in a stop-signal task in which subjects had to be ready to withdraw the prepared motor response. Impulsive subjects showed higher baseline delta, theta and alpha power and higher magnitude of induced responses in low frequencies. They also showed lower phase-locking in low frequencies to auditory stimuli and higher phase-locking to the overt behavioral response onset. High BI scorers showed higher baseline alpha power and higher desynchronization in this frequency band in response to stimuli. The reported findings appear to support the idea that low frequency oscillations are associated with behavioral approach and alpha with behavioral inhibition tendencies but these associations are only valid for induced responses to stimuli.

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Author information

Author/s: Knyazev, Gennady G (GG); Levin, Evgenij A (EA); Savostyanov, Alexander N (AN);

Affiliation: State Research Institute of Physiology, Siberian Branch of the Russian Academy of Medical Sciences, Novosibirsk, Russia. G.G.Knyazev(-atsign-)iph.ma.nsc.ru

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: International journal of psychophysiology : official journal of the International Organization of Psychophysiology (Int J Psychophysiol), published in Netherlands. (Language: eng)

Reference: 2008-Jun; vol 68 (issue 3) : pp 242-54

Dates: Created 2008/04/28; Completed 2008/08/13;

PMID: 18396343, status: MEDLINE (last retrieval date: 11/6/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Acoustic Stimulation - methods
Adolescent
Adult
Anxiety - physiopathology
Brain - physiology
Brain Mapping
Electroencephalography
Female
Humans

Humans
Impulsive Behavior - physiopathology
Individuality
Inhibition (Psychology)
Male
Psychometrics
Reaction Time - physiology
Spectrum Analysis
Time Factors

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