SEMANTIC CATEGORY PRIMING IN THE LEFT CEREBRAL HEMISPHERE

The representation of semantic codes in the cerebral hemispheres and t he interhemispheric communication of these codes, was investigated in two priming experiments where prime and target words were independentl y projected to the left or right visual fields (LVF or RVF). Nonassoci ated category exemplars were employed as related pairs in a lexical de cision task and separated by a stimulus onset asynchrony of 250 msec i n Experiment 1 and 450 msec in Experiment 2. Both experiments obtained priming effects when primes and targets were both projected to the RV F, but not the LVF. Semantic category primes projected to the RVF also facilitated responses to LVF targets, but no LVF-RVF priming was obta ined. This suggests that semantic category information is relayed from left to right hemisphere, but not vice versa. The results are consist ent with the view that semantic categories are represented in the left hemisphere.