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Increased temporal and frontal slow-wave delta (1–4 Hz) and theta (4–7
Hz) activities are the most consistent resting-state neural abnormalities
reported in schizophrenia. The frontal lobe is associated with negative
symptoms and cognitive abilities such as attention, with negative
symptoms and impaired attention associated with poor functional
To establish whether frontal dysfunction, as indexed by slowing, would be
associated with functional impairments.
Eyes-closed magnetoencephalography data were collected in 41 participants
with schizophrenia and 37 healthy controls, and frequency-domain source
imaging localised delta and theta activity.
Elevated delta and theta activity in right frontal and right
temporoparietal regions was observed in the schizophrenia
v. control group. In schizophrenia, right-frontal
delta activity was uniquely associated with negative but not positive
symptoms. In the full sample, increased right-frontal delta activity
predicted poorer attention and functional capacity.
Our findings suggest that treatment-associated decreases in slow-wave
activity could be accompanied by improved functional outcome and thus
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