[Hemispheric specialization in recognition of alphabetic material]. / Specializzazione emisferica nel riconoscimento di materiale alfabetico.

ABSTRACT

Choice reaction time with manual response (right and left hand) to alphabetic stimuli (capital letters A-E = positive stimulus, and R-F = negative stimulus) projected at 5 degrees in the nasal and in temporal hemisfield of the right eye (half of the subjects) and of the left eye (the remaining half) was studied in 12 normal subjects (6 males and 6 females). The RT mean values were the result of the mean of the median of each block of trial, repeated in 4 sessions. The percentage of errors was also considered. The mean RT was calculated for each of the possible 4 experimental conditions hand-hemifield, in the males and females separately, and in all the cases. The data obtained, submitted to the statistical analysis, show a significant superiority of the left hemisphere in the recognition of the alphabetic stimuli, both in males and females, despite the prevalence of the right hand.