This report tells of the procedures and results of a psychophysical study of 28 3.8-year-old-boys from the Harlem Training Center. In spite of an experimental situation that was something of an ordeal, some meaningful data was generated. The main area investigated in this study was the evoked-response indices of temporal processing, that is, the recordable response of visual cortex to single flashes and pairs of flashes. The flash pairs were presented with varying inter-flash intervals. Stimuli consisted of pulses of light provided by a Grass PS-2 photostimulator. Dependent measures of subject responding were derived from monopolar recordings that were taken from the right occipital region centered between midline and ear. Computer memory was fed to a Mosley X-Y plotter, which provided permanent ink records of the data. Several findings are reported but the main conclusions concern relations between children and adults regarding the visual evoked response: (1) the time required between successive stimuli for the emergence of coherent cortical responses is longer in children than in adults and (2) backward masking or inter-stimulus interference is much more pronounced in children. (Author/MH)