Answer: Priming
Explanation: This is a case study of Priming. Priming is a phenomenon in psychology, which involves exposure or introduction to one stimulus influences how individuals respond to a subsequent stimulus.
However, there is no prior knowledge or intention about the subsequent stimulus. These stimuli are usually related in form of image or words.
Thus, priming had occur in the experiment conducted. There is facilitation or high speed of response to items priorly exposed to in the first task.