Figure 3.

Alpha activity in non-engaged sensorimotor areas predicts performance in a somatosensory working memory task. (A) Sample patterns of electrical stimuli were presented to the right hand. After a 2-s retention period subjects had to answer whether the frequency of the probe stimulus was higher or lower. (B) The 8–13 Hz alpha activity in the retention interval was compared with respect to correct and incorrect responses. The right hemisphere alpha activity was stronger for successful performance. (C) Time–frequency representations of power showed that the task-dependent effect was constrained to the alpha band in the retention interval. (D) The sources of the task-dependent alpha activity were localized in right sensorimotor and parieto-occipital regions. Reproduced from Haegens et al. (2009).