Return to the Dynamically Adjusted Motion Prediction Task (DAMP) page

Script Author: Katja Borchert, Ph.D. ( for Millisecond Software, LLC
Date: 03-03-2016
last updated: 03-03-2016 by K.Borchert ( for Millisecond Software LLC

Script Copyright © 03-03-2016 Millisecond Software


This script implements a Dynamically Adjusted Motion Prediction Task (DAMP) similarly to the one described in:

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.

This script implements 100% informative feedback (Experiment1).

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.iqx implements an interweaved stairway procedure to assess individual
Arrival Times Difference Thresholds. Script DynamicallyAdjustedMotionPrediction.iqx (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.

This batch script runs both scripts sequentially and hands of the ArrivalTimeDifference (ATD) threshold.
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