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Gamma band dysfunction in patients with schizophrenia during a Sternberg Task: A wavelet analysis

Published online by Cambridge University Press:  23 March 2020

D.D. Marasco ,
G. Di Lorenzo ,
A. Petito ,
M. Altamura ,
G. Francavilla ,
L. Inverso  and
A. Bellomo
D.D. Marasco*
Affiliation:
Laboratory of Neurophysiology, Department of Clinical and Experimental Medicine, Section of Psychiatry, University of Foggia, Foggia, Italy
G. Di Lorenzo
Affiliation:
Laboratory of Psychophysiology, Department of Systems Medicine, University of Rome “Tor Vergata”, Rome, Italy
A. Petito
Affiliation:
Laboratory of Neurophysiology, Department of Clinical and Experimental Medicine, Section of Psychiatry, University of Foggia, Foggia, Italy
M. Altamura
Affiliation:
Laboratory of Neurophysiology, Department of Clinical and Experimental Medicine, Section of Psychiatry, University of Foggia, Foggia, Italy
G. Francavilla
Affiliation:
Laboratory of Neurophysiology, Department of Clinical and Experimental Medicine, Section of Psychiatry, University of Foggia, Foggia, Italy
L. Inverso
Affiliation:
Laboratory of Neurophysiology, Department of Clinical and Experimental Medicine, Section of Psychiatry, University of Foggia, Foggia, Italy
A. Bellomo
Affiliation:
Laboratory of Neurophysiology, Department of Clinical and Experimental Medicine, Section of Psychiatry, University of Foggia, Foggia, Italy
*
*Corresponding author.

Abstract

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Background

Increasing body of evidence suggest that patients with schizophrenia (SCZ) present dysfunction of the gamma band oscillations (GBO) during cognitive tasks. The current study aimed to explore the GBO activity in SCZ during a Sternberg task.

Materials and methods

Twenty-eight chronic stabilized SCZ and 18 healthy controls (HC), were recruited. Ongoing EEG was recorded during the execution of the Sternberg task. Continuous EEG data were band-pass filtered (1–100 Hz) and corrected for eye blink and muscle artefacts by ICA. For each subject, the event-related-spectral-perturbation (ERSP) and the inter-trial-coherence (ITC) were computed at the Pz channel only for those stimulus-locked segments containing correct responses. GBO wavelet analysis was performed with two different increasing cycle ranges (3 to 5.8 and 12 to 22.6; frequency range: 30–90 Hz), to obtain the best information about temporal and frequency dynamics. Student's t test (with multiple comparisons FDR correction) was used to compare the groups.

Results

During the manteinance phase (4000 to 4600 ms after the stimulus onset), SCZ presented a significant increase, respect to HC, in low GBO activity (range: 30-50 Hz;). In the other phases of the Sternberg task (encoding, probe presentation and response periods), no significant difference in GBO was observed between SCZ and HC.

Conclusions

These findings are in line with the evidence that GBO dysfunction in SCZ is present during selective phases of the working memory task. Future studies have to clarify the role of GBO dysfunction on the cognitive performance and the clinical utility of selective GBO modulation during cognitive rehabilitation.

Disclosure of interest

The authors have not supplied their declaration of competing interest.

Type
EW348
Information
European Psychiatry , Volume 33 , Issue S1: Abstracts of the 24th European Congress of Psychiatry , March 2016 , pp. S198
Copyright
Copyright © European Psychiatric Association 2016
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