Transmission of Brain Activity During Cognitive Task
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The transmission of brain activity during constant attention test was estimated by means of the short-time directed transfer function (SDTF). SDTF is an estimator based on a multivariate autoregressive model. It determines the propagation as a function of time and frequency. For nine healthy subjects the transmission of EEG activity was determined for target and non-target conditions corresponding to pressing of a switch in case of appearance of two identical images or withholding the reaction in case of different images. The involvement of prefrontal and frontal cortex manifested by the propagation from these structures was observed, especially in the early stages of the task. For the target condition there was a burst of propagation from C3 after pressing the switch, which can be interpreted as beta rebound upon completion of motor action. In case of non-target condition the propagation from F8 or Fz to C3 was observed, which can be connected with the active inhibition of motor cortex by right inferior frontal cortex or presupplementary motor area.
KeywordsTransmission of information in brain Propagation of EEG activity Short-time directed transfer function Granger causality Cognitive processes Continuous attention test Working memory Active inhibition
We would like to thank Dr. B. Burle for helpful discussions. This work was supported partly by the COST Action BM0601 “NeuroMath” and grant of Polish Ministry of Science and Higher Education (Decision No. 119/N-COST/2008/0).
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