Return to the Auditory Oddball Task page

last updated:  11-18-2015 by K.Borchert for Millisecond Software LLC
Copyright ©  11-18-2015 Millisecond Software


This script implements the Auditory Oddball Task as described in Williams, Simms, Clark, and Paul (2005). 

Williams, L.M., Simms, E., Clark, C.R., & Paul, R. H. (2005). The test-retest reliability of a 
standardized neurocognitive and neurophysiological test battery: "neuromarker". 
International Journal of Neuroscience, 115, 1605-30.

The script uses baseline tones of 500hz and oddball tones of 1000hz. 
TTL Marker signals indicating stimulus onset, type of stimulus, and response times are sent to the 
parallel port for purposes of synchronizing with EEG/ERP measures. 

Participants listen to a random sequence of 2 different beeps. They are asked to press
the Spacebar whenever they hear the high tone (go trial) and refrain from doing anything
if they hear the low tone (nogo trial).

The default data stored in the data files are:

(1) Raw data file: 'AuditoryOddballTask_raw*.iqdat' (a separate file for each participant)

build:							Inquisit build
computer.platform:				the platform the script was run on
date, time, subject, group:		date and time script was run with the current subject/groupnumber 
blockcode, blocknum:			the name and number of the current block
trialcode, trialnum: 			the name and number of the currently recorded trial
									(Note: not all trials that are run might record data; by default data is collected unless /recorddata = false is set for a particular trial/block) 
stimulusitem:					the presented stimuli in order of trial presentation
response:						the participant's response
correct:						the correctness of the response (1 = correct; 0 = incorrect)
latency: 						the response latency (in ms)
/lasttrial:						the name of the trial
/skipcount:						counts the number of skipped oddball trials

(2) Summary data file: 'AuditoryOddballTask_summary*.iqdat' (a separate file for each participant)

script.startdate:				date script was run
script.starttime:				time script was started
script.subjectid:				subject id number
script.groupid:					group id number
script.elapsedtime:				time it took to run script (in ms)
computer.platform:				the platform the script was run on
/completed:						0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run)

1 Testblock of 200 trials: 24 oddball signals (go trials), 176 baseline (nogo trials)
-> order is randomized (constraint: no consecutive oddball trials)
-> trials last 1000ms

oddball signal: 1000Hz sound
baseline signal: 500Hz sound
sound files can be edited under section Editable Stimuli

can be edited under section Editable Instructions

check below for (relatively) easily editable parameters, stimuli, instructions etc. 
Keep in mind that you can use this script as a template and therefore always "mess" with the entire code to further customize your experiment.

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