___________________________________________________________________________________________________________________ IOWA GAMBLING TASK (IGT) (in German) ___________________________________________________________________________________________________________________ last updated: 02-23-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-23-2022 Millisecond Software German translation by K. Borchert for Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This sample script implements the Iowa Gambling Task (IGT). The IGT task assesses risk learning by utilizing rewards and punishment in an uncertain simulated real-life decision making context The implemented procedure is based on: Bechara A., Damasio A. R., Damasio H., Anderson S. W. (1994). Insensitivity to future consequences following damage to human prefrontal cortex. Cognition, 50, 7-15 . ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participant are presented 4 decks of cards and are asked to select a card from one of the 4 decks with their mouse. By turning over the cards, participants can win money but also lose money. The four different decks can be categorized as advantageous (overall more wins than losses) or disadvantageous (overall more losses than wins). ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 5 minutes to complete __________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'iowagamblingtask_german_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 deckOrderGroup: the experimental deck group (1-4) the subject was randomly assigned to (refers to order of the advantageous (deck3, deck4) and disadvantegeous (deck 1, deck2) decks on the screen) group1: deck1(D), deck2(D), deck3(A), deck4(A) group2: deck3(A), deck1(D), deck4(A), deck2(D) group3: deck4(A), deck3(A), deck2(D), deck1(D) group4: deck2(D), deck4(A), deck1(D), deck3(A) 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 cardsselected: counts the number of card selections (across all blocks) card1itemnumber- card2itemnumber: store the itemnumber of the card face that needs to be presented on screen for each of the 4 decks response: the participant's response (e.g. which deck was chosen; the response "deck1" refers to the actual disadvantegous deck1 and not the position of the deck on the screen) responseCategory: "advantageous" vs. "disadvantageous" latency: the response latency (in ms) gain: stores the trial's gain depending on choice loss: stores the trial's loss depending on choice currenttotal: stores the current amount of coins won (2) Summary data file: 'iowagamblingtask_german_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) deckOrderGroup: the experimental deck group (1-4) the subject was randomly assigned to (refers to order of the advantageous (deck3, deck4) and disadvantegeous (deck 1, deck2) decks on the screen) group1: deck1(D), deck2(D), deck3(A), deck4(A) group2: deck3(A), deck1(D), deck4(A), deck2(D) group3: deck4(A), deck3(A), deck2(D), deck1(D) group4: deck2(D), deck4(A), deck1(D), deck3(A) count_deck1select- count_deck4select: count all the actual deck1-deck4 choices across all blocks prop_deck1select- prop_deck4selectt: proportion of specific deck selections Note: deck1 always refers to deck1 and not specific deck location countAdvantage_total: counts the total number of advantageous selections (deck 3 & deck 4) countDisAdvantage_total: counts the total number of disadvantageous selections (deck 1 & deck 2) NET: difference btw. total number of advantageous and disadvantageous selections (positive NET -> overall more advantageous selections) per blocks of 20 trials: countAdvantage1: counts the number of advantageous selections (deck 3 & deck 4) during trials 1-20 countDisAdvantage1: counts the number of disadvantageous selections (deck 1 & deck 2) during trials 1-20 NET1: difference btw. number of advantageous and disadvantageous selections during trials 1-20 countAdvantage2: counts the number of advantageous selections (deck 3 & deck 4) during trials 21-40 countDisAdvantage2: counts the number of disadvantageous selections (deck 1 & deck 2) during trials 21-40 NET2: difference btw. number of advantageous and disadvantageous selections during trials 21-40 countAdvantage3: counts the number of advantageous selections (deck 3 & deck 4) during trials 41-60 countDisAdvantage3: counts the number of disadvantageous selections (deck 1 & deck 2) during trials 41-60 NET3: difference btw. number of advantageous and disadvantageous selections during trials 41-60 countAdvantage4: counts the number of advantageous selections (deck 3 & deck 4) during trials 61-80 countDisAdvantage4: counts the number of disadvantageous selections (deck 1 & deck 2) during trials 61-80 NET4: difference btw. number of advantageous and disadvantageous selections during trials 61-80 countAdvantage5: counts the number of advantageous selections (deck 3 & deck 4) during trials 81-100 countDisAdvantage5: counts the number of disadvantageous selections (deck 1 & deck 2) during trials 81-100 NET5: difference btw. number of advantageous and disadvantageous selections during trials 81-100 ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ * The game is set up to play 1 block of 100 trials * The four decks are assigned a (permanent) screen location by groupnumber (4 different groups). regardless of actual screen presentation: deck1/deck2 = disadvantageous deck3/deck4 = advantageous * By default, in this script the win/loss probabilities assigned are aligned with the model of "once played, cards are NOT returned to the deck" (therefore turning probabilities into actual frequencies over the course of 10 selections of each deck; see more info under section EXPRESSIONS) * the script collects performance data in blocks of 20 trials ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ provided by Millisecond Software - can be edited under section Editable Stimuli ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ provided by Millisecond Software - 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. The parameters you can change are: / startamount: the amount of money owned at the start of the game; startamount (default) = 2000 /showcardinfo: shows information about number of cards played/how many more to come