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							*SUBLIMINAL PRIMING - Draine & Greenwald (1998)*
							*Batch Script*
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 06-24-2013
last updated: 02-06-2020 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Script Copyright © 02-06-2020 Millisecond Software

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BACKGROUND INFO 	
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This script implements a batch script to run a Subliminal Priming Procedure with adaptive response window.

In general, priming procedures are simple response-timed binary categorization tasks of items from two target
categories  (e.g. positive vs. negative adjectives). Priming Procedures are based on the assumption that 
people respond faster if the target category was already 'mentally activated' by briefly presenting items 
(called 'primes') that are closely connected in one's mind. For example, a person should be faster to quickly 
categorize the target word 'good' as 'positive' after the brief presentation of the prime word 'ice-cream' than
after the brief presentation of the prime word 'famine'. Priming Procedure can thus be used to study 
implicit attitudes. Faster reaction times to targets after primes from a specific category are interpreted 
as indicative of an existing  relationship/association between  the categories in the person's mind.

If the primes are presented with a temporal duration that can be consciously processed, the primes are
called 'supraliminal'. If the duration of the primes is so short that they are outside one's conscious 
awareness the primes are called 'subliminal'. This script uses subliminal primes.

The implemented primining procedure in this script constraints response latencies to fall within a 
narrow response window. The default set-up uses response windows that are adaptive to people's speed
performance.

The implemented procedure is based on:

Draine, S.C, & Greenwald, A.G. (1998). Replicable Unconscious Semantic Priming. Journal of Experimental Psychology: 
General, 127, 286-303.
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TASK DESCRIPTION	
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Participants are asked to do 2 tasks.

Task 1 (Indirect Measure, evaluation classification): Participants are asked to categorize target words (names) 
into negative/positive (male/female) categories. Targets are preceded by masked primes of 
3 different prime durations. Participants are asked to respond within
an adaptable response window. Primes can be either congruent or incongruent with the target category.
(this procedure is run by script subliminalpriming_draine_im.iqx)

Task 2 (Direct Measure): Participants are asked to categorize masked primes (words/names OR letter strings of Xs and Gs)
that appear for 3 different prime durations into words (names) or letter strings. 
Primes are followed by distractor words but participants are asked to ignore the distractors.
(this procedure is run by script subliminalpriming_draine_dm.iqx)

Notes:
(1) in this script -> odd groupnumbers run pleasant/unpleasant words; even groupnumbers run male/female names
(2) default response keys are "A" and "L"
A(left): unpleasant/male/XG string
L(right): pleasant/female/word/name

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DURATION 
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IM: Practice Sessions ~8 minutes
IM: Test 6 blocks at ~2 minutes => ~12 minutes
DM: Practice Session ~5 minutes
DM: Test 6 blocks at ~2 minutes => ~12 minutes

Total: ~37 minutes

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DATA FILE INFORMATION 
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separate data files are generated for the Indirect Measure and the Direct Measure Task

See 'subliminalpriming_draine_im.iqx' and 'subliminalpriming_draine_dm.iqx'
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EXPERIMENTAL SET-UP 
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See 'subliminalpriming_draine_im.iqx' and 'subliminalpriming_draine_dm.iqx'

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STIMULI
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See 'subliminalpriming_draine_im.iqx' and 'subliminalpriming_draine_dm.iqx'

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INSTRUCTIONS 
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See 'subliminalpriming_draine_im.iqx' and 'subliminalpriming_draine_dm.iqx'