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Increased short-interval intracortical inhibition in un-medicated patients with schizophrenia.

BACKGROUND: Schizophrenia is associated with changes in inhibitory and facilitatory brain networks which can be assessed by motor cortex excitability.

OBJECTIVE: Here, we investigate differences between large cross-sectional samples of un-medicated and medicated patients with schizophrenia and healthy controls in single- and double-pulse transcranial magnetic stimulation parameters.

METHODS: We measured right abductor digiti minimi muscle activity in 71 un-medicated, 43 medicated patients and 131 healthy controls. To exclude sample bias analyses were repeated with groups comparable for age and gender (un-medicated: n = 43; medicated: n = 38; controls: n = 49).

RESULTS: Un-medicated patients showed increased short-interval intracortical inhibition (SICI) in contrast to medicated patients and healthy controls. No group differences were found for resting and active motor threshold, cortical silent period and intracortical facilitation.

CONCLUSION: Increases in SICI are in contrast to literature and highlight the necessity for large-scaled multi-centric studies with high methodological standards.

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