Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com), Millisecond
Created: January 25, 2015
Last Modified: January 01, 2023 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
This script implements the Mismatched Negativity Oddball Paradigm as published in
Bramon,E., Croft, R.J, McDonald, C., Virdi, G.K., Gruzelier, J.G., Torsten Baldeweg, T., Sham, P.C., Frangou, S. & Murray, R.M. (2004). Mismatch negativity in schizophrenia: a family study. Schizophrenia Research, 67, 1– 10.
7 minutes
Participants sit in comfortable chairs while the script plays a series of tones (mix of Standard and Oddballs) to them over headphones. Participants are instructed to keep their eyes open and to disregard the sounds. Different portsignals are sent for Standard and Oddball sounds.
- script runs 3 blocks block.MNO of 400 trials each
- each block.MN0 randomly selects the order of 340 standard (85%) and 60 oddball sounds (15%)
- standard sounds play for 25ms and oddball sounds play for 50ms
- an interstimulus interval (isi) of 300ms (editable parameter) is added to each sound
- port signals that coincide with the onset of stimuli are sent along with type of tone
Tones created in Audacity by Millisecond
standard: 1000hz, 25ms duration, 5-ms rise/fall time
oddball: 1000hz, 50ms duration, 5-ms rise/fall time
(both should be played at 80db)
can changed under section Editable Code -> Editable Instructions
File Name: mismatchednegativityoddball_summary*.iqdat
| Name | Description |
|---|---|
| inquisit.version | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| 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 |
File Name: mismatchednegativityoddball_raw*.iqdat
| Name | Description |
|---|---|
| build | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| date | Date the session was run |
| time | Time the session was run |
| subject | Participant ID |
| group | Group number |
| session | Session number |
| blockCode | Name of the current block |
| blockNum | Number of the current block |
| trialCode | Name of the current trial |
| trialNum | Number of the current trial |
| stimType | 1 = standard; 2 = oddball |
| stimulusitem1/stimulusitem.2 | The presented stimuli in order of trial presentation |
| elapsedTime | Session duration in ms |
The procedure can be adjusted by setting the following parameters.
| Name | Description | Default |
|---|---|---|
| isi | Interstimulus interval (isi) in ms (isi: time between offset of one stimulus and onset of another) | 300ms |
| standardDuration | Duration of the standard tone in ms | 25 |
| oddballDuration | Duration of the oddball tone in ms if these durations are changed, the corresponding soundfiles also need to change | 50 |