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							Columbia Card Task (CCT) -- "Cold" Version


Script Author: David Nitz ( for Millisecond Software, LLC.
last updated:  01-30-2016 by K. Borchert ( for Millisecond Software, LLC

Copyright ©  01-30-2016 Millisecond Software


This script implements the 'Columbia Card Task' (CCT) as described in:

	Figner, B., Mackinlay, R.J., Wilkening, F., & Weber, E.U. (2009). Affective and deliberative
	processes in risky choice: Age differences in risk taking in the Columbia Card Task. 
	Journal of Experimental Psychology: Learning, Memory, and Cognition, 35, 709–730.

Participants are presented with 32 cards, all face down. Some of these cards are 'gain cards'
(=make money when turned over), some of them are loss cards (= lose money when turned over).
Participant are asked to indicate how many cards they want to turn over for any given trial based on
- number of hidden loss cards
- amount of money they can make from each gain card
- amount of money that they will lose if a loss card is encountered.

In the 'cold' version of the Columbia Card Task, participants do NOT get to see the result
of their choices (no feedback).

The default data stored in the data files are:

(1) Raw data file: 'CCT_Cold_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)
latency: 						the response latency (in ms)
response:						the participant's response

gameround:						The current round number
trialtype:						The type of trial, where '1' designates an experimental trial and '0' indicates a filler trial
losscards:						The number of loss cards in a given round
gainamount:						The gain amount per gain card in a given round
lossamount:						The loss amount in a given round
ncards:							The number of cards turned over by the subject in a given round
nsafecards:						The number of cards safe to turn over in a given round
score:							Points won / lost in a given round
totalscore:						Points won / lost across the whole task

(2) Summary data file: 'CCT_Cold_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; 1 = script was completed (all conditions run)
totalscore:									Points won / lost across the whole task


The CCT relies on a full factorial within-subject design. Three game parameters / factors 
are varied between trials: 	

(a) Number of hidden loss cards (1, 2, or 3 loss cards)
(b) Gain amount per gain card (10, 20, or 30 points)
(c) Loss amount (250, 500, or 750 points)

There are a total of 3 x 3 x 3 = 27 unique combinations. These are encoded in the list elements in section EDITABLE LISTS.

Each of the 3 x 3 x 3 = 27 combinations of factor levels is presented twice, resulting in 54 
experimental trials. The presentation of experimental trials is divided into two blocks of 27 
trials, i.e. all 27 unique trials are run once in random order and then a second time in a 
different random order. 
Note that the experimental trials rely on rigged feedback, i.e. the hidden loss card(s) will 
always be the last possible card(s) that may be turned over by the participant. For example, 
in a trial with 2 loss cards, only the 31st card turned over by the subject will be a loss card
independent of which cards the subject actually decides to pick.

To maintain the impression that respondents are playing a real game of chance, 9 additional 
trials are randomly interspersed among the 54 rigged experimental trials. All of this is 
handled by list 'trialtype' (see section EDITABLE LISTS), where the value '0' designates a filler trial 
(9 times) and the value '1' designates an experimental trial (54 times). Consequently, there will be a total of
63 game rounds (trials) to play. Note that filler trials should be excluded from data analysis.

provided by Millisecond Software

see section Editable Instructions

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.

check section Editable Lists for:
(a) Number of hidden loss cards (1, 2, or 3 loss cards)
(b) Gain amount per gain card (10, 20, or 30 points)
(c) Loss amount (250, 500, or 750 points)

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