After a minute, the rat was allowed to run to the other side of the maze to find copies of Object B (B3) and Object R (R3; Trial 2; see Table 2C for remaining trials).
Overall, 32.7% of the trials had to be discarded: 3.5% due to artefacts, 13.9% because of incorrect responses in Task 1, and 15.3% due to errors in Task 2. The mean number of remaining trials for each condition ranged between 25 and 29.
Response errors in the up/down visual judgments were recorded as a percentage of remaining trials for each condition and discarded from reaction time (RT) calculations.
According to this scoring method, a participant is awarded six points for each shift that is successfully completed and an additional point for each remaining trial, provided all five shifts are made before reaching 120 trials.
Thus, a participant was awarded six points for each shift that had been successfully completed and an additional point for each remaining trial provided both shifts were made before reaching the maximum number of trials.
For the remaining trial we obtained an abridged version of the protocol from the clinical trials.gov website.
Furthermore, the investigators had no means of checking whether or not the dropouts, although chronic amphetamine users, in fact relapsed to substance use for the remaining trial period.
The ISI between the two pulses was modified based on subject response with a 1 up/1 down forced-choice protocol for the first 10 trials and responses for the remaining trials of the run were tracked with a 2 up/1 down forced-choice tracking protocol in which two correct subject responses resulted in a decrement in the ISI.
The ISI between the two pulses was modified based on subject response with a 1up/1down algorithm for the first 10 trials and responses for the remaining trials of the run were tracked with a 2up/1down algorithm in which two correct subject responses resulted in a decrement in the ISI.
Time-frequency analysis was applied for all remaining trials.
