Peak Alpha Frequency in Abstinent Cannabinoid Users in the Resting State and During Cognitive Task Performance

We compared the values of peak alpha frequency in abstinent cannabinoid users and in healthy controls. There were no differences in the resting state between these two groups. The cannabinoid group showed the increase of peak alpha frequency during the cognitive task performance in comparison with the background. However this increase was less expressed in the cannabinoid group than in the control group. In abstinent cannabinoid users the spectral peak frequency of alpha activity was decreased in the frontal electrodes during the cognitive task perfoiniance as compared to control subjects. Counting rate (operations per minute) was smaller in cannabinoid group than in the control group. The results suggest disorders of working memory and information processing in the experimental group.