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								PART-WHOLE FACE RECOGNITION TASK
SCRIPT INFO

Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 11-19-2014
last updated: 01-25-2016 by K.Borchert (katjab@millisecond.com) for Millisecond Software LLC

Copyright © 01-25-2016 Millisecond Software


BACKGROUND INFO

											*Purpose*
This script runs the Part-Whole Face Recognition Task (Experiment 1) described by:

Tanaka, J.W. & Farah, M.J. (1993). Parts and wholes in face recognition.
The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology, 46, 225-245.

											  *Task*
Participants are asked to memorize intact and scrambled faces of 6 men and learn to associate them
with their corresponding names. In a learning phase, participants view a random order of the 
faces with verbal recordings of the corresponding names with each face being presented for 5s 
(5 repetitions for each face). In a test phase, participants work through 2 forced-choice 
recognition tests. In one test, they are presented with the whole faces and have to choose
between the correct face and a foil (differs in one feature). In another test, they are presented
with features (eyes, nose, mouth) and have to choose between the correct feature and a foil.


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

(1) Raw data file: 'PartWholeRecognition_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 
/conditionorder:				1 = intact -> scrambled; 2: scrambled -> intact
/stimgrouporder:				1 = group1 stimuli-> group2 stimuli; 2 = group2 stimuli-> group1 stimuli
/part:							1 = part 1; 2 = part 2 (same task is run once with intact faces and once with scrambled faces)
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)
/condition:						stores the currently run condition (intact vs. scrambled)
/currentgroup:					stores the currently used stimuli group
/targetposition:				1 = left;  2 = right (position of the correct face/feature)
/itemnumber:					stores the currently used itemnumber
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)

(2) Summary data file: 'PartWholeRecognition_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)
/propcorr_Iwhole:				proportion correct I(ntact) whole (faces) recognition trials
/propcorr_Ipart:				proportion correct I(ntact) part (feature) recognition trials
/propcorr_Swhole:				proportion correct S(scrambled) whole (faces) recognition trials
/propcorr_Spart:				proportion correct S(scrambled) part (feature) recognition trials

EXPERIMENTAL SET-UP

4 experimental groups: assignment by groupnumber (see section EXPERIMENT for more info)
(1) 2 conditions (intact faces vs. scrambled faces): tested within in a blocked format; order of conditions counterbalanced
(2) 2 groups of stimuli (group1 vs. group2): used for intact and scrambled conditions (tested within in a blocked format); order of groups counterbalanced

2 Parts: intact vs. scrambled
each part runs a 
(1) Learning Phase: 5 blocks of 6 faces, random order of faces within each block, 
faces are presented for 5s (default) together with a recording of the assigned name (as well as the written name)
(30 trials total)
!NOTE: if the learning trials should be self-paced, go to section TRIALS -> learningphase and follow instructions
(2) Test Phase (Forced-Choice Recognition Test): 2 blocks -> Whole (whole faces) vs. Parts (individual features); 
order of blocks is randomly determined for each participant and each part (12 trials total)
a) Whole: target faces (presented during learning) are contrasted with foil faces (foil faces are changed in either eyes (2), nose (2) or mouth (2))
position of targets to left vs. right side of screen is randomly determined (half will be right) - 6 trials
b) Part: target features (2 eyes, 2 noses, 2 mouths) are contrasted with foil features; foil features are the same as used for the corresponding foil faces
position of targets to left vs. right side of screen is randomly determined (half will be right) - 6 trials


STIMULI
2 groups of stimuli each with 6 male faces (12 faces total).
Stimuli are not original to Tanaka & Farah (1993). Stimuli are provided by Millisecond Software and can 
be replaced under section Editable Stimuli
Detailed information regarding stimulus generation is provided.

Sound files were recorded in Audacity by a female native speaker of American English. Files can
be replaced under section Editable Stimuli -> item.names_soundfiles

INSTRUCTIONS
Instructions are not original to Tanaka & Farah (1993). Instructions are provided by Millisecond Software
in the form of html pages. The files can be replaced under section Editable Instructions.
Word changes can be made directly within the files.

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:

/picturepresentationduration:			stores for how long the faces are presented in ms (default: 5000ms)
										-> the duration of the trials will at least be as long as duration of name soundfiles

Picture Dimensions:
/size_learningpics:						sets the size of the learning pictures (default: 80%)
/size_testfaces:						sets the size of the test faces (default: 80%)
/size_testfeatures:						sets the size of the test features (default: 80%)

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