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									LETTER FLUENCY
SCRIPT INFO

Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 1-29-2015
last updated:  02-11-2016 by K.Borchert for Millisecond Software LLC

Copyright ©  02-11-2016 Millisecond Software


BACKGROUND INFO

											*Purpose*
This script runs a simple Letter Fluency Test with phonetic categories (letters A, F, S) similar to 
the Controlled Oral Word Association Test (COWAT).
This test collects written input.

											  *Task*
Participants are asked to type as many words as they can that begin with letters A, F, S (tested in blocked-design).
They have  2 min for each letter (default). 


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

(1) Raw data file: 'LetterFluency_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) 
stimulusitem:					the presented stimuli in order of trial presentation
response:						the participant's response
latency: 						the response latency (in ms)

/targetletter:					stores the currently run targetletter
/response:						stores the string response for a given targetletter
/response_nospaces:				stores the string response for a given targetletter minus spaces
/estimate_wordcount:			estimates word count by comparing the length of the response with and without spaces

(2) Summary data file: 'LetterFluency_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)
/estimatetotal:					sum of the estimated wordcounts for the 3 letters
/targetletter1:					stores the first targetletter (default: "A") ('first' does not refer to order in which letters were run in)
/targetletter2:					stores the second targetletter (default: "F")
/targetletter3:					stores the third targetletter (default: "S")
/estimate_wordcount1-
/estimate_wordcount3:			estimates word count by comparing the length of the response with and without spaces for a given target letter


EXPERIMENTAL SET-UP
3 blocks: one block per targetletter
each block has a timelimit of 2min (editable parameter)

Word Count-Estimate: Algorithm
Inquisit attempts to estimate the number of words for each letter by
- replacing all spaces up to 5 with a single space
- replacing all line breaks with a single space
- comparing the response string that contains only single spaces with a response strings that contains no
spaces at all 
=> the estimated word count is the differences in string length plus 1
(e.g. "slug snail snake" vs. "slugsnailsnake" => 2 spaces + 1 = 3 words)

Note: the algorithm only provides a rough estimate of the word count (and it does NOT
check whether the words are correct)

STIMULI
This script test letters A, F, S because of their frequency in English
Different letters can be substituted under EDITABLE CODE -> Editable Values

INSTRUCTIONS
provide by Millisecond Software - instructions can be edited under
EDITABLE CODE -> Editable Instructions


EDITABLE CODE:
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.

The parameters you can change are:

/targetletter1:				stores the first targetletter (default: "A")
/targetletter2:				stores the second targetletter (default: "F")
/targetletter3:				stores the third targetletter (default: "S")

/timelimit:					stores the number of ms that participants have to come up with the words (default: 120000ms => 2min)
/warningduration:			stores the duration in ms of the warning signal to prepare participants to get ready for next round (default: 1000ms)


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