<p><strong>Introduction: </strong>Cognitive reserve (CR) is a neuroprotective factor that allows persons to mitigate the impact of negative conditions such as dementias. Neurophysiological techniques such as electroencephalography facilitate the observation of the functional dynamics of cognitive processes. <strong>Aim: </strong>To study the relationship between cognitive reserve and absolute power (AP) of the electroencephalogram (EEG) registered during the Wisconsin Card Sorting Test (WCST) of older adults without neuropathology. <strong>Methods: </strong>The EEG of 10 healthy elderly people was recorded during WCST solution, CR was measured and correlated with the AP of the EEG. <strong>Results: </strong>Cognitive reserve was negatively associated with the AP of the Delta and Theta bands. <strong>Conclusions:</strong> CR is negatively correlated with AP this implies that the participants with low CR have less efficient task related activation.</p>