On the basis of dynamic memory theory, alpha rhythm parameters of the
background electroencephalogram reflect the neurophysiological restric
tions of the memory span and rate of action. The quantitative relation
between the short-term memory span and the number of waves in the alp
ha rhythm spindle were found. Subjects, possessing the longer spindle
with the large number of waves have the advantage over the other one i
n the productivity of the short-term memory.