Theta Rhythm

Publication Title: 
Psychological Medicine

BACKGROUND: Mindfulness meditation (MM) practices constitute an important group of meditative practices that have received growing attention. The aim of the present paper was to systematically review current evidence on the neurobiological changes and clinical benefits related to MM practice in psychiatric disorders, in physical illnesses and in healthy subjects. METHOD: A literature search was undertaken using Medline, ISI Web of Knowledge, the Cochrane collaboration database and references of retrieved articles.

Author(s): 
Chiesa, A.
Serretti, A.
Publication Title: 
Social Neuroscience

In the dictator game, a proposer can share a certain amount of money between himself or herself and a receiver, who has no opportunity of influencing the offer. Rational choice theory predicts that dictators keep all money for themselves. But people often are offering money to receivers, despite their opportunity to maximize their own profit and therefore showing altruistic behavior. In this study, we investigated the influence of the altruism of the dictator, the anonymity of the decision and the income of the receiver on the offer made by a dictator.

Author(s): 
Rodrigues, Johannes
Ulrich, Natalie
Hewig, Johannes
Publication Title: 
Folia Psychiatrica Et Neurologica Japonica

A controlled, quantitative investigation of the electroencephalogram (EEG) and transcendental meditation (TM) revealed that EEG changes during TM were rarely as pronounced or consistent as previous reports suggest. There was considerable variation between subjects, some displaying no EEG changes at all during TM compared with an equal period of non-meditation. Any changes that did occur in a particular individual were not necessarily repeated in a subsequent session.

Author(s): 
Teb?cis, A. K.
Publication Title: 
The International Journal of Clinical and Experimental Hypnosis
Author(s): 
London, P.
Publication Title: 
Behavioural Brain Research

Hippocampal electrical activity has been studied in 12 unanaesthetized, unrestrained rabbits during hypnosis and spontaneous activity in the experimental cage, before and among hypnosis trials. Quantitative analyses showed that rhythmic slow activity (RSA) occurred during exploratory movements (mean frequency 7.2 Hz) and also during spontaneous immobility, but a lower percentage and frequency (6.5 Hz).

Author(s): 
Fontani, G.
Grazzi, F.
Lombardi, G.
Carli, G.
Publication Title: 
Behavioural Brain Research

This study is an attempt to detect the most important modifications of physiological parameters occurring during pressure immobility in rabbits and to compare them with those recorded during animal hypnosis. Like the latter, pressure immobility is characterized by the development of high voltage slow waves in the EEG, reduction in frequency and amount of rhythmic slow activity in the hippocampus (RSA) and depression of spinal polysynaptic reflexes. Systolic and diastolic blood pressures are not modified. Duration of two types of immobility is positively correlated within individuals.

Author(s): 
Carli, G.
Farabollini, F.
Fontani, G.
Grazzi, F.
Publication Title: 
Perceptual and Motor Skills

22 men and women, students in psychology, were given the Eysenck Personality Questionnaire, also percent theta, alpha and beta EEG spectral powers were evaluated during an hypnotic induction induced according to Barber's method. The EEG performance was compared with two baseline eyes-open, eyes-closed conditions and with a neutral control situation of listening to a weather report. No relation was found between Extraversion-Introversion scores and scores on the Barber Suggestibility Scale.

Author(s): 
De Pascalis, V.
Imperiali, M. G.
Publication Title: 
International Journal of Psychophysiology: Official Journal of the International Organization of Psychophysiology

EEG was recorded monopolarly at frontal (F3, F4), central (C3, C4) and occipital (O1, O2) derivations during A-B-A conditions of waking rest, hypnosis (rest, arm immobilization, mosquito hallucination, hypnotic dream), and waking rest. Stringently screened on several measures of hypnotic susceptibility, 12 very low hypnotizable and 12 very highly hypnotizable, right-handed undergraduate, subjects participated in one session. Evaluations were Fast-Fourier spectral analysis, EEG coherence between selected derivations and maximum spectral power within EEG bands.

Author(s): 
Sabourin, M. E.
Cutcomb, S. D.
Crawford, H. J.
Pribram, K.
Publication Title: 
Journal of Abnormal Psychology

Electroencephalograph (EEG) measures described high- and low-hypnotizable participants in terms of 3 conditions: an initial baseline period; baselines preceding and following a standard hypnotic induction; and during the induction. The following results were obtained. 1. High and low-hypnotic susceptible participants displayed a differential pattern of EEG activity during the baseline period, characterized by greater theta power in the more frontal areas of the cortex for the high-susceptible participants. 2.

Author(s): 
Graffin, N. F.
Ray, W. J.
Lundy, R.
Publication Title: 
International Journal of Psychophysiology: Official Journal of the International Organization of Psychophysiology

EEG correlates of self-generated happy and sad emotions during counterbalanced conditions of waking and hypnosis were investigated in 16 low ("lows') and 15 highly ("highs') hypnotizable men, as assessed by the Harvard Group Scale of Hypnotic Susceptibility and the Stanford Hypnotic Susceptibility Scale, Form C. Using log mean spectral magnitude, 11 frequency bands (3.5-42 Hz) were evaluated at frontal (F3, F4), central (C3, C4), and parietal (P3, P4) regions.

Author(s): 
Crawford, H. J.
Clarke, S. W.
Kitner-Triolo, M.

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