University Of Tasmania

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Is 'gamma' (40 Hz) synchronous activity disturbed in patients with traumatic brain injury?

journal contribution
posted on 2023-05-17, 07:22 authored by Slewa-Younan, S, Green, AM, Baguley, IJ, Kim FelminghamKim Felmingham, Haig, AR, Gordon, E
OBJECTIVES: The objective of this work is to determine whether Gamma (40 Hz) synchronous activity has disturbed patients with severe traumatic brain injury (TBI). Methods: Using a conventional auditory oddball paradigm, the extent of Gamma synchrony across multiple scalp sites in specific frequency bands as a function of time was examined in 15 patients with severe TBI and 15 age- and sex-matched controls. Averaged Gamma synchrony was analyzed using within and between group multiple analyses of variance with region (left versus right hemisphere, anterior versus posterior region) as the within factor. Results: Compared to controls, subjects with TBI displayed significantly delayed early Gamma latency (from 2150 to 150 ms) (F(1,28) ¼ 10.28, P , 0:003) across all sites in addition to other specific regional disturbances. For late Gamma synchrony, subjects with TBI displayed delayed Gamma latency at the left hemisphere (from 200 to 450 ms) (F(1,28) ¼ 8.71, P , 0:006) and posterior region (F(1,28) ¼ 9.18, P , 0:006) in comparison to controls. Conclusions: Impaired integration of spatially distributed brain activity (‘40 Hz’ electroencephalogram rhythms) may be an important marker of deficits of cortical network binding postulated to be abnormal in people who have survived TBI.


Publication title

Clinical Neurophysiology










School of Psychological Sciences


Elsevier Sci Ireland Ltd

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Customer Relations Manager, Bay 15, Shannon Industrial Estate Co, Clare, Ireland

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Socio-economic Objectives

Clinical health not elsewhere classified