It was recently shown that cognitive functions requiring more widespread brain integration relate to slower EEG activity, whereas cognitive performance supported by local brain integration is associated with faster EEG components (Von Stein & Sarnthein, 2000). Associations were studied between performance on WAIS and resting EEG spectral parameters in heroin abusers and normal young males. The most prominent associations between WAIS and EEG variables were consistently registered in polar and lateral frontal/temporal derivations. WAIS subtests predominantly loading on retrieval from long-term memory stores were significantly associated with delta bands mean frequencies. Subtests with strong working memory component related to theta2 mean frequency at temporal leads. Subtests requiring problem-solving operations correlated with alpha bands parameters, whereas psychomotor speed was associated with beta power. The data are in agreement with the hypothesis of Von Stein & Sarnthein (2000).