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								Paced Auditory Serial Addition Test (PASAT)
									*Computerized version with Norms*
SCRIPT INFO

Script Author: Jeffrey Q. Ouyang for Millisecond Software, LLC
last updated: 09-04-2018 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Script Copyright © 09-04-2018 Millisecond Software


BACKGROUND INFO

											*Purpose*
A script that implements a computerized version of Gronwall's (1977) the Paced Auditory Serial Addition Test (PASAT).

Gronwall, D. (1977). Paced auditory serial-addition task: a measure of recovery from concussion. 
Perceptual and Motor Skills, 44, 367–373.

Norms based on:
Sabine A. Wingenfeld, Daniel J. Holdwick Jr., Joanne L. Davis & Brenda B. Hunter (1999). 
Normative Data on Computerized Paced Auditory Serial Addition Task Performance.
The Clinical Neuropsychologist, 13:3, 268-273, 
DOI: 10.1076/clin.13.3.268.1736


Cautionary Note on Norms in this script:
The Inquisit script calculates percentiles based on the norms published by Wingenfeld et al (1999) who ran
a fairly similar set up to the default Inquisit script. However, whereas the Inquisit script collects the 
response in the form of a selected number from a provided circle of numbers, Wingenfeld et al (1999) 
collect verbal responses that are later scored for accuracy. 

It is possible, for example, that by reporting the sums verbally, suppression failures (aka suppressing
the previous sum when adding the new digit to the previous digit) are more likely
than with the set up used in this script. This might be the case as the verbal sum might
interfer to a greater degree with the verbal digits than the non-verbal response of simply selecting the sum from a 
provided circle of digits. However, Wingenfeld report that errors typically were simple addition errors 
rather than suppression failures even with verbal responses.

On the other hand, having to find the correct response button might take more time
than simply saying the response out loud.



											  *Task*
Participants hear a sequence of single digit numbers (1-9) presented at a constant speed 
and are asked to mentally sum the last 2 digits (NOT a running total). 
Participants then select the current sum from a circle of numbers 1-18 (= nonverbal response)


DATA FILE INFORMATION: 
The default data stored in the data files are:

(1) Raw data file: 'PASAT_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
/currentLevel:					the currently tested level
trialcode, trialnum: 			the name and number of the currently recorded trial
									(Note: not all trials that are run might record data) 
/currentdigit:					the currently presented digit
/currentSum:					the current correct sum
response:						the participant's response
correct:						the correctness of the response (1 = correct; 0 = incorrect)
/NR:							1 = no response was made within response window; 0 = otherwise
/error:							1 = addition error; 0 = otherwise
/suppressionFailure:			1 = response is consistent with using previous sum (not digit) to generate new sum; 0 = otherwise
/consecutiveCorrect:			counts the number of consecutive correct responses (resets back to 0 after 3 correct responses in a row)
latency: 						the response latency (in ms)

(2) Summary data file: 'PASAT_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; 1 = script was completed (all conditions run)

Note: percentiles are calculated based on Wingenfeld et al (1999), table3 (p. 272) 

/countCorrect_level1:				counts the number of correct responses for level1
/zscore_correct_level1: 			z-score of number of correct responses based on Wingenfeld et al (1999)
/p_correct_level1:					percentile of z-score of number of correct responses based on Wingenfeld et al (1999)

/countNR_level1:					counts the number of no responses for level1
/zscore_NR_level1: 					z-score of number of no responses based on Wingenfeld et al (1999)
/p_NR_level1:						percentile of z-score of no responses based on Wingenfeld et al (1999)

/countErrors_level1:				counts the number of addition errors for level1 (could include random selections)
/zscore_errors_level1: 				z-score of number of number of addition errors based on Wingenfeld et al (1999)
/p_errors_level1:					percentile of z-score of number of addition errors based on Wingenfeld et al (1999)

/countSF_level1:					counts the number of suppression failures for level 1
/zscore_SF_level1: 					z-score of number of suppression failures based on Wingenfeld et al (1999)
/p_SF_level1:						percentile of z-score of suppression failures based on Wingenfeld et al (1999)
										suppression failure = using the previous sum instead of previous digit

/countcorrStrings_level1:			counts the number of times three consecutive correct responses were given on level 1
/zscore_corrStrings_level1: 		z-score of number of correct strings (3 correct in a row) based on Wingenfeld et al (1999)
/p_corrStrings_level1:				percentile of z-score of correct strings (3 correct in a row) based on Wingenfeld et al (1999)
(same for level2-level4)



EXPERIMENTAL SET-UP
	
(I)	Practice:
* 11 practice trials (+ start trial)
* provides feedback
* default SOA: 4000ms
	
(II) Test:	
* 4 possible speed levels (level1-level4); number of levels to run can be set under section Editable Values 
(by default, all 4 levels are run)
	level 1: default SOA 2400ms
	level 2: default SOA 2000ms
	level 3: default SOA 1600ms
	level 4: default SOA 1200ms

* by default, each level presents 60 trials (not counting the first digit presentation);
number can be set under section Editable Values
* to be added digit is selected randomly without replacement (reset after all digits 1-9 have been used) for each trial

Trial Sequence:
verbal digit presentation (SOA: depends on level): select sum of last 2 digits from a circle of numbers 1-18

DURATION
~10 min for default set-up

INSTRUCTIONS
can be edited under section Editable Instructions

EDITABLE CODE:
check below for (relatively) easily editable values, 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.

The values you can change are:

levelCount:					number of test levels (blocks) to run. Can be 1, 2, 3 or 4
practiceTrials:				number of practice trials to run
level1Trials:				number of trials to run in level 1 (not counting the first)
level2Trials:				number of trials to run in level 2
level3Trials:				number of trials to run in level 3
level4Trials:				number of trials to run in level 4
SOAPractice: 				Stimulus Onset Asynchrony (SOA) in practice trials (= trialduration)
SOALevel1: 					Stimulus Onset Asynchrony (SOA) in level1 trials (= trialduration)
SOALevel2: 					Stimulus Onset Asynchrony (SOA) in level2 trials (= trialduration)
SOALevel3: 					Stimulus Onset Asynchrony (SOA) in level3 trials (= trialduration)
SOALevel4: 					Stimulus Onset Asynchrony (SOA) in level4 trials (= trialduration)

circleproportion:			proportion of canvas height used for the circle radius of response buttons (default: 0.4)


/debugmode:					1 = the correct answer is displayed on the screen
							0 = the correct answer is not displayed on the screen (default)
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