Abstract
We conducted 2 experiments to investigate an effect of repeated presentations of digit sequences that numbers from 1 to 9 were arranged at random. Subjects were asked to memorize 9 colums of numbers one by one, and then to recognize a test digit sequence comprise 3 colums. Some sequences were presented 4 times at every 6, 12, or 24 trials in each experimental session. The other sequences were not repeated. Results showed that hit rate significantly deteriorated at the third presentation with the lag of 24 trials in the condition of the duration 600ms(exp.1). In the duration of 200ms(exp.2) , however, the deficit of hit rate was not obtained. These results imply that the deficit of hit rate occurs in a specific elapsed time from a prior trial of a digit sequence to current trial of the sequence.
