Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com), Millisecond
Created: January 16, 2016
Last Modified: January 25, 2023 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
This script implements a Dynamically Adjusted Motion Prediction Task (DAMP) similarly to the one described in Ullsperger & Crampon (2003).
This batch script runs both scripts sequentially and hands of the ArrivalTimeDifference (ATD) threshold.
NOTE: Ullsperger & Crampon (2003) kept the error rates constant for each participant (~40% error rate) by (dynamically) adapting the task difficulty of the task to each participant's ability. "Task difficulty" was operationalized solely as the time difference of arrival of the two balls at the finish line. No further details of the adjustment procedure are provided by U & C other than "To keep the error rate high during the first trials of the experiments, individual difficulty levels were determined in a training session (100 trials and only informative feedback) that was performed during the anatomical scans (p. 4309)."
Script DynamicallyAdjustedMotionPrediction_Baseline.iqjs implements an interweaved stairway procedure to assess individual Arrival Times Difference Thresholds. Script DynamicallyAdjustedMotionPrediction.iqjs (current one) uses the established Arrival Times Difference Threshold to keep error rate constant. Arrival Time Difference Threshold in this script: (roughly) the threshold at which participants start to guess with a 50/50 probability which ball reaches the finish line first.
Ullsperger, M. & Crampon v., D.Y. (2003). Error Monitoring Using External Feedback: Specific Roles of the Habenular Complex, the Reward System, and the Cingulate Motor Area Revealed by Functional Magnetic Resonance Imaging. The Journal of Neuroscience,23(10),4308–4314.
25 minutes