Complex experimental model, including the series of the stimuli of the
different modality and significance was employed. It was shown, that
the contigent negative variation (CNV) reflects retention processes of
events of this activity sequence in the associative unity. Each CNV c
omponent should be considered and estimated in behavioral context. The
spatio-temporal structure of the CNV and evoked potentials' parameter
s are depend on the complexity of the activity, on the stimulus signif
icance, on the motor preparation presence and other factors.