Pii: S1388-2457(99)00011-5

نویسندگان

R. Quian Quiroga

M. SchuÈrmann

چکیده

Objectives: By using the Wavelet Transform, a time frequency representation with nearly optimal resolution, we studied responses to stimulation in the `alpha' range (10 Hz). Methods: Visual evoked responses of 10 healthy subjects were studied with 3 different stimulus types (no-task VEP, non-target and target stimulus). Results: Upon all the stimulus types, event-related responses in the 10 Hz (`alpha') range were distributed in the whole scalp, best de®ned in the occipital locations, the responses on the anterior electrodes being less pronounced and delayed. In some subjects, these event-related responses were prolonged upon target stimulation in posterior locations. Conclusions: These results point towards a distributed origin of event-related alpha oscillations with functional relation to sensory processing, and possibly to further processes. q 1999 Elsevier Science Ireland Ltd. All rights reserved.

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