___________________________________________________________________________________________________________________ PART-WHOLE FACE RECOGNITION TASK ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 11-19-2014 last updated: 02-25-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-25-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script runs a Part-Whole Face Recognition Task. The implemented procedure is based on: 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. (Experiment 1) ___________________________________________________________________________________________________________________ TASK OVERVIEW ___________________________________________________________________________________________________________________ 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. ___________________________________________________________________________________________________________________ TASK DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 8 minutes to complete ___________________________________________________________________________________________________________________ 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: The specific Inquisit version used (the 'build') that was run computer.platform: the platform the script was run on (win/mac/ios/android) date, time: date and time script was run subject, group: with the current subject/groupnumber session: with the current session id blockcode, blocknum: the name and number of the current block (built-in Inquisit variable) trialcode, trialnum: the name and number of the currently recorded trial (built-in Inquisit variable) Note: trialnum is a built-in Inquisit variable; it counts all trials run; even those that do not store data to the data file such as feedback trials. Thus, trialnum may not reflect the number of main trials run per block. 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) condition: stores the currently run condition (intact vs. scrambled) currentgroup: stores the currently used stimuli group targetposition: (position of the correct face/feature) 1 = left; 2 = right itemnumber: stores the currently used itemnumber stimulusitem.1-3: 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); measured from: onset of face image (2) Summary data file: 'partwholerecognition_summary*.iqdat' (a separate file for each participant) inquisit.version: Inquisit version run computer.platform: the platform the script was run on (win/mac/ios/android) startDate: date script was run startTime: time script was started subjectid: assigned subject id number groupid: assigned group id number sessionid: assigned session id number elapsedTime: time it took to run script (in ms); measured from onset to offset of script 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. Note: spoken names are produced by Inquisit's voice over feature. By default, a generic female voice is used. ___________________________________________________________________________________________________________________ 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. To edit html-files: open the respective documents in simple Text Editors such as TextEdit (Mac) or Notepad (Windows). ___________________________________________________________________________________________________________________ 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%)