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									Lexical Decision Task
SCRIPT INFO

last updated: 01-14-2016 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC
Copyright © 01-14-2016 Millisecond Software


BACKGROUND INFO

											*Purpose*
    This script implements a version of the lexical decision task described in 
    Lepore & Brown (2002), The Role of Awareness: Divergent Automatic Stereotype 
    Activation and Implicit Judgment Correction, Social Cognition, 20 (4), pp 321-351.
	
	The script uses placeholders for actual stimuli.

	
											  *Task*
Participants are asked to categorize words into words and nonwords by pressing the E-key (non words)
or I-key (words) as fast as possible when a word/nonword stimulus appears on screen.


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

(1) Raw data file: 'LexicalDecisionTask_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) 
response:						the participant's response
correct:						the correctness of the response (1 = correct; 0 = incorrect)
latency: 						the response latency (in ms); latency measured from onset of stimulus
stimulusitem:					the presented stimuli in order of trial presentation

(2) Summary data file: 'LexicalDecisionTask_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)
/PropCorrect:					overall proportion correct across all testtrials
/MeanRT:						overall mean latency of correct responses across all correct testtrials
/STD:							overall standard deviation of correct latencies
/MedianRT:						overall median latency of correct responses across all correct testtrials

/PropCorrect_CatW:				proportion correct of responses to category words
/MeanRT_CatW:					mean latency of correct responses to category words
/STD_CatW:						standard deviation of correct responses to category words
/MedianRT_CatW:					median latency of correct responses to category words

/PropCorrect_NeutralW:			proportion correct of responses to Neutral words
/MeanRT_NeutralW:				mean latency of correct responses to Neutral words
/STD_NeutralW:					standard deviation of correct responses to Neutral words
/MedianRT_NeutralW:				median latency of correct responses to Neutral words

/PropCorrect_NonW:				proportion correct of responses to Non words
/MeanRT_NonW:					mean latency of correct responses to Non words
/STD_NonW:						standard deviation of correct responses to Non words
/MedianRT_NonW:					median latency of correct responses to Non words


EXPERIMENTAL SET-UP
3 types of words (category words, neutral words, nonwords) tested within participants in a mixed design

1 Practice Block: 6 trials (3 neutral words, 3 nonwords; order randomly selected)
1 Test Block: 52 trials (13 category words, 13 neutral words, 26 non words; order randomly selected)

Trial Sequence:
* (for 700ms) -> stimulus (250ms) -> blank screen until response (latency measured from onset of stimulus)

STIMULI
are spaceholders - actual stimuli can be easily inserted under section Editable Stimuli

INSTRUCTIONS
can be edited under section 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.

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