This script was generously provided by Mario Wenzel, Thomas Kubiak and Tamlin Conner to be shared via Millisecond
Software's Script Library. Thank you!
Last Modified: January 15, 2023 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
This script implements a Multi Source Interference Task (cMSIT). The MSIT was originally designed by Bush et al (1998) as a behavioral fMRI task to assess the functional integrity of the acc subdivision in selected neuropsychiatric disorders. According to Bush et al the MSIT combines multiple dimensions of cognitive interference such as flanker, and Stroop interference.
The implemented procedure in this script with white stimuli and a random order of stimuli is similar to the procedure described in Wenzel et al (2013).
Wenzel, M., Kubiak, T., & Conner, T. S. (2013). Positive affect and self-control: Attention to self-control demands mediates the influence of positive affect on consecutive self-control. Cognition and Emotion. https://dx.doi.org/10.1080/02699931.2013.851069
Original MSIT: Bush, G., Shin, L.M., Holmes, J., Rosen, B.R., & Vogt, B.A. (2003). The Multi-Source Interference Task: Validation study with fMRI in individual subjects. Molecular Psychiatry, 8, 60–70.
2 minutes
Participants are presented stimuli consisting of 3 digits (1, 2, 3s) (or 1 digit and 2 X's = controls). One of the digits is different from the flanking digits and differs in size. Participants are asked to press a response button (1, 2, 3) as fast as possible to report which digit was different.
- This script runs 39 trials (3 control, 12 uni-source, 24 multi-source) in a random order.
- response buttons: 1, 2, 3 on keyboard and/or numeric pad
Trial Sequence:
- fixation cross for 500ms
- stimulus presented for 2000ms
- accuracy feedback 500ms after response or stimulus timeout
all stimuli are provided by Mario Wenzel, Thomas Kubiak and Tamlin Conner
control (target always printed larger): 3 (1 fontsize x 1 identities of flanking letters x 3 target digits x 1 possible positions of target digit)
uni-source (target position and response key position are congruent): 12 (2 fontsizes x 2 identities of flanking numbers x 3 target digits x 1 possible positions of target digit)
multi-source (target position and response key position are incongruent): 24 (2 fontsizes x 2 identities of flanking numbers x 3 target digits x 2 possible positions of target digit)
instructions are provided by Mario Wenzel, Thomas Kubiak and Tamlin Conner
and can be edited under EDITABLE CODE -> Editable Instructions
File Name: msit_digit_random_summary*.iqdat
| Name | Description |
|---|---|
| inquisit.version | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| computer.touch | 0 = device has no touchscreen capabilities; 1 = device has touchscreen capabilities |
| computer.hasKeyboard | 0 = no external keyboard detected; 1 = external keyboard detected |
| startDate | Date the session was run |
| startTime | Time the session was run |
| subjectId | Participant ID |
| groupId | Group number |
| sessionId | Session number |
| elapsedTime | Session duration in ms |
| completed | 0 = Test was not completed 1 = Test was completed |
| propCorrect | Proportion correct overall |
| meanRT | Mean latency (in ms) of all correct responses |
| std | Standard deviation of all correct latencies |
| medianRT | Median latency (in ms) of all correct responses |
File Name: msit_digit_random_raw*.iqdat
| Name | Description |
|---|---|
| build | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| computer.touch | 0 = device has no touchscreen capabilities; 1 = device has touchscreen capabilities |
| computer.hasKeyboard | 0 = no external keyboard detected; 1 = external keyboard detected |
| date | Date the session was run |
| time | Time the session was run |
| subject | Participant ID |
| group | Group number |
| session | Session number |
| blockcode | The name the current block (built-in Inquisit variable) |
| blocknum | The number of the current block (built-in Inquisit variable) |
| trialcode | The name of the currently recorded trial (built-in Inquisit variable) |
| trialnum | The number of the currently recorded trial (built-in Inquisit variable) trialnum is a built-in Inquisit variable; it counts all trials run even those that do not store data to the data file. |
| interferenceSource | Uni = interfering digits but target digit's position and response key are congruent multi = interfering digits AND target digit's position and response key are incongruent control = no interfering digits, no interfering position and response key incongruency |
| corrResp | The correct response key |
| stimulusItem.1-stimulusItem.2 | The presented stimuli in order of trial presentation |
| response | The participant's response (scancode of response key) 2,79 => 1 3, 80 => 2 4, 81 => 3 |
| responseText | Stores the actual label of the response key pressed ("1", "2", "3") |
| correct | The correctness of the response (1 = correct; 0 = otherwise) |
| latency | The response latency (measured from onset of stimulus, in ms) |
The procedure can be adjusted by setting the following parameters.
| Name | Description | Default |
|---|---|---|
| stimPresentationDurationMS | 2000: the duration (in ms) that the stims are presented (= response timeout) |