Testing a theory of brain function by computer methods. IV. Comparing spatial and temporal order in the two cerebral...

Continuing with a plan for overall testing of the timing and sequencing of brain processes, further testing techniques are introduced for probing a normal adult's short-term central processes, especially those which are employed in reading a short digit span. The tests are administered by means of a personal computer and can provide information on the individual subject's characteristic sequencing and timing of particular central processes. In a subject whose first language is read from left to right, the presented tests reported in this paper can reveal an interesting asymmetry. A temporal display of digits in the right visual field is correctly perceived more readily than in the left. Conversely, a brief, spatial display of digits in the left visual field is correctly reported more often than in the right. It is suggested, therefore, that there are individuals whose left hemisphere is superior in handling a temporal sequence of digits while the right hemisphere is superior in handling a spatial display of digits.