Early gamma response of sleep is sensory/perceptual in origin.

Full Abstract

The goal of the study was to investigate the gamma response of the brain and its functional correlates in rapid eye movements (REM) sleep and the three stages of non-REM sleep. Data on overnight sleep were acquired from 16 healthy, young adult, volunteer males. Neuroelectric activity was recorded from seven recording sites (Fz, Cz, Pz, F3, F4, P3, P4) in response to auditory stimuli (2000 Hz deviant and 1000 Hz standard stimuli: 65 dB, 10 ms r/f time, 50 ms duration) under passive oddball paradigm. Data were analyzed with the Fourier transform and digital filtering and also the recently developed technique of time-frequency component analysis (TFCA). TFCA displayed the gamma response under all stages of sleep. Statistical analysis did not reveal a significant effect of stimulus type, recording site or sleep stage on the three parameters of TFCA, which included maximum value of the time-frequency representation of the extracted gamma component, maximum magnitude of the time-domain representation of the component and the energy of this component. The gamma period included N1 and the early theta response, both of which are related to sensory-perceptual processing in the literature. According to these findings, the gamma response is possibly related, as in wakefulness, to early stimulus processing that also includes sensory/perceptual operations.

Author information

Author/s: Karakas, Sirel (S); Arikan, Orhan (O); Cakmak, Emine D (ED); Bekçi, Belma (B); Dogutepe, Elvin (E); Tüfekçi, Ilhan (I);

Affiliation: Hacettepe University, Specialty Area of Experimental Psychology, Cognitive Psychophysiology Research Unit, 06532 Beytepe, Ankara, Turkey. skarakas(-atsign-)hacettepe.edu.tr

Journal and publication information

Publication Type: Comparative Study; Journal Article

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

Reference: 2006-Oct; vol 62 (issue 1) : pp 152-67

Dates: Created 2006/09/05; Completed 2006/11/01; Revised 2006/11/15;

PMID: 16712994, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

External Links for this article
(including full text providers, if available):

Click Electronic Full-text Provider Links to see options for finding the electronic full text links to this article. Note there may be a subscription or fee required for access to the full text. See our FAQ for information on finding FREE full text articles.

This article may also be located in paper journal collections available in many libraries. Use the Journal and Publication Information above to find the full article.