John gruzelier | Goldsmiths, University of London (original) (raw)

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Papers by John gruzelier

The British Journal of Psychiatry, 1983

Http Dx Doi Org 10 1080 00207140108410061, Jan 31, 2008

Journal of Abnormal Psychology, Sep 1, 1993

Brightness discriminations in a divided-field paradigm were examined with a signal-detection proc... more Brightness discriminations in a divided-field paradigm were examined with a signal-detection procedure in three sessions, the second with hypnosis. Practiced, hypnotically susceptible Ss were subdivided into high- (n = 6) and medium- (n = 5) susceptible groups on the basis of a susceptibility scale monitored throughout the hypnosis session. High-susceptible Ss showed increases in d' in the left visual field (right hemisphere) with hypnosis, whereas medium-susceptible Ss showed bilateral enhancements. Beta remained invariant in both groups across three sessions but was higher in the left visual field. The results provide evidence of altered brain function with hypnosis and an association of focal right hemispheric changes with high susceptibility and, through the invariance of beta, fail to support the attribution of perceptual changes to attitudinal, nonstate factors.

International Journal of Psychophysiology, May 31, 2003

Psychological Bulletin, 2005

International Journal of Psychophysiology Official Journal of the International Organization of Psychophysiology, 2014

Biological Psychiatry, 1985

Previous research has established the stability of the contralateral dominance effect of the audi... more Previous research has established the stability of the contralateral dominance effect of the auditory temporal N120 peak amplitude. The purpose of this experiment was to examine event-related potential (ERP) asymmetries in schizophrenia, with particular reference to this contralateral dominance phenomenon. Ten unmedicated schizophrenic patients and ten controls heard a series of monaural tones, with no task requirements, while EEG was recorded from Cz, Pz, T3, and T4 referred to linked earlobes. Patients were characterized by smaller N120 amplitudes than controls, an effect that was slightly more pronounced at temporal sites. Patients failed to show the normal N120 contralateral dominance effect. Hemisphere asymmetry ratios revealed that 50% of the patients showed ipsilateral dominance in the auditory pathways. Furthermore, the hemisphere asymmetries (whether ipsilaterally or contralaterally dominant) seen in patients were significantly greater than for controls. These data offer a new level of explanation for schizophrenic performance abnormalities in dichotic listening paradigms and an explanation for for the apparent dichotomy in patient performance between exaggerated right ear advantage (REA) and left ear advantage (LEA).

Contemporary Hypnosis, Feb 22, 2006

... of habituation in the schizophrenia spectrum has concerned electrophysiological approaches in... more ... of habituation in the schizophrenia spectrum has concerned electrophysiological approaches involving ... 86 sented, irregular patterns of orientating and habituation are the most common ... P200 com-ponents, suggestive of a generalized thalamocortical activation imbalance rather ...

Biological Psychiatry, Sep 15, 2001

Int J Psychophysiol, 1994

... 86 Williams, Croft, Ferdinand and Gruzelier An examination of participants' SERP dat... more ... 86 Williams, Croft, Ferdinand and Gruzelier An examination of participants' SERP data showed that there were no significant changes in ... decrease in late ERP components during hypnotic analgesia (Arendt-Nielsen et al., 1990; Danziger et al., 1998; Zacharie & Bjerring, 1994). ...