The following repository includes data from an experiment in which we examined the influence of delay on credit assignment changes . Specifically, we were interested to explore whether delay had a different influence on credit assignment when presented before the delivery of reward (i.e., inter-stimulus interval delay; henceforward ISI) or after (i.e., inter-trial interval delay; henceforward ITI). This was performed as part of Noa Shen's thesis in 2020-2022. **Participants**. 30 Undergraduate Tel Aviv University students (76% female; Mean age=23.2 (SD=1.88)) completed the study at the lab in return for course credit compensation or received payment of 40 NIS. All participants reported normal or corrected vision. All participants signed informed consent before participating in the study. **Procedure**. Participants performed a multiple-armed bandit task (Figure 1). Each block included four flowers from which two were selected randomly each trial by the computer. Each flower led to reward on a fixed probability (i.e., 0.35,0.45,0.55,0.65), and participants were asked to choose each trial the flower they thought was most likely to lead to reward. In half of the trials the delay appeared between choice-feedback and outcome (interstimulus interval - ISI condition) and in the other half of the trials the delay appeared between the outcome and the next trial (intertrial interval -ITI condition). Delay duration was also manipulated between trial and range from 0.5-8 seconds randomly from uniform distribution. **Data Treatment**. The first trial on each block, trials with implausibly quick reaction times (<200ms), exceptionally slow reaction times (>4000ms), or no-response trials were omitted (5.8% of all trials). There were no participants with more than 25% trials of fast/slow RT's. There were no participants with more than 10% staying key trials. Therefore, we did not exclude participants at all.