The purpose of this study was to demonstrate that the neural efficiency of the human brain as measured by parameters of sensory evoked potentials varies depending on the sensory input used within the same subject. The subjects were 213 children aged eight to 16 years, selected randomly. Computer analysis of EEG data was performed in order to discover parameters related to intelligence test scores. Results indicated: (1) the amplitude of the visual evoked potential at certain time points following the stimulus is significantly greater for high IQ subjects; and (2) it was shown that there is a tendency for high IQ subjects to have greater energy above 14 cycles in visual evoked responses when compared to low IQ subjects. There is little doubt that study of the electrical activity of the brain can be related to intellectual functioning and continued research seems justified. (Author/EK)