___________________________________________________________________________________________________________________ *STIMULUS RESPONSE COMPATIBILITY TASK (SRCT)* ___________________________________________________________________________________________________________________ Script Author: original Inquisit script written by Barkby et al (2012) last updated: 02-28-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a Stimulus Response Compatibility Task (SRCT); a reaction time task used to measure the speed of automatic approach/avoidance tendencies towards particular item categories. The implemented procedure is described in: Barkby, H., Dickson, J.M., Roper, L., & Field, M. (2012). To Approach or Avoid Alcohol? Automatic and Self- Reported Motivational Tendencies in Alcohol Dependence. Alcoholism: Clinical and Experimental Research, 36, 361-368. Millisecond Software LLC thanks Dr. Matt Field for generously providing the original scripts as well as the original stimuli! ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participants are presented with either an alcohol-related picture or a control picture. Depending on instructions, they are asked to press the arrow keys of the numeric key pad (default, can be changed under EDITABLE VALUES) so as to move a manikin, that is either presented above (top) or below (bottom) the picture, towards (or away) from the alcohol related pictures and away (towards) the control pictures. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 15 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'srct_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. (parameter) responsekey_up: default scancode for the up-key (key "Y") (parameter) responsekey_down: default scancode for the down-key (key "B") (parameter) responsekey_left: default scancode for the left-key (key "F") (parameter) responsekey_right: default scancode for the right-key (key "J") expcondition: 6 experimental conditions; subject assignment by groupnumber Experiment runs 3 main blocks (block.main_approach_alc, block.main_avoid_alc, block.main_left_alc/block.main_right_alc). The order of the 3 main blocks is counterbalanced across participants. Furthermore, half the participants in each counterbalanced condition run block.main_right_alc, the other half run block.main_left_alc => 6 conditions stimulus: contains the name of the picture image corrResponse: stores the correct scancode response code response: the participant's response (scancode of response button) 21 = Y 48 = B 33 = F 36 = J correct: the correctness of the response (1 = correct; 0 = incorrect) latency: the response latency (in ms) (2) Summary data file: 'srct_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) expcondition: 6 experimental conditions; subject assignment by groupnumber Experiment runs 3 main blocks (block.main_approach_alc, block.main_avoid_alc, block.main_left_alc/block.main_right_alc). The order of the 3 main blocks is counterbalanced across participants. Furthermore, half the participants in each counterbalanced condition run block.main_right_alc, the other half run block.main_left_alc => 6 conditions propcorr_total: overall proportion correct (test trials only) meanRT_total: overall mean latency (in ms) of correct test trials propcorr_AlcApproach: proportion correct Alcohol Approach test trials meanRT_AlcApproach: mean latency (in ms) of correct Alcohol Approach test trials propcorr_AlcAvoid: proportion correct Alcohol Avoid test trials meanRT_AlcAvoid: mean latency (in ms) of correct Alcohol Avoid test trials propcorr_CtrlApproach: proportion correct Control Approach test trials meanRT_CtrlApproach: mean latency (in ms) of correct Control Approach test trials propcorr_CtrlAvoid: proportion correct Control Avoid test trials meanRT_CtrlAvoid: mean latency (in ms) of correct Control Avoid test trials propcorr_AlcLeft: proportion correct Alcohol Left test trials meanRT_AlcLeft: mean latency (in ms) of correct Alcohol Left test trials propcorr_AlcRight: proportion correct Alcohol Right test trials meanRT_AlcRight: mean latency (in ms) of correct Alcohol Right test trials propcorr_CtrlLeft: proportion correct Control Left test trials meanRT_CtrlLeft: mean latency (in ms) of correct Control Left test trials propcorr_CtrlRight: proportion correct Control Right test trials meanRT_CtrlRight: mean latency (in ms) of correct Control Right test trials ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ Experiment runs 3 main blocks (block.main_approach_alc, block.main_avoid_alc, block.main_left_alc/block.main_right_alc). The order of the 3 main blocks is counterbalanced across participants. Furthermore, half the participants in each counterbalanced condition run block.main_right_alc, the other half run block.main_left_alc. => 6 experimental conditions, assignment by groupnumber (default, can be changed under EXPERIMENT) Blocks: 1. block.main_approach_alc: move the manikin towards alcohol related pictures and away from control pictures (in half the trials manikin is on top, in the other half the manikin is on the bottom) 2. block.main_avoid_alc: move the manikin away from alcohol related pictures and towards control pictures (in half the trials manikin is on top, in the other half the manikin is on the bottom) 3a. block.main_left_alc: move the manikin to the left for alcholo related pictures and to the right for control pictures (in half the trials manikin is on top, in the other half the manikin is on the bottom) 3b. block.main_right_alc: move the manikin to the right for alcholo related pictures and to the left for control pictures (in half the trials manikin is on top, in the other half the manikin is on the bottom) Each main block has 8 practice trials and 2 x 28 experimental trials (= 2 subblocks). For each subblock of each main block (e.g. block.main_approach_alc) the type of trial is randomly sampled from the four corresponding trials (e.g. trial.alcapproach_manikintop, trial.alcapproach_manikinbottom, trial.ctrlavoid_manikinbottom, trial.ctrlavoid_manikintop) without replacement => 14 alcohol images and 14 control images are shown, 7 of each with the manikin on top and 7 with the manikin on the bottom. Over the course of the 2 x 28 trials (= 2 subblocks), each picture appears twice (once in the first subblock, once in the second subblock), once with the manikin on top and once with the manikin on the bottom. Trials: * A blank screen is shown for 1000ms, followed by the alcholol-related or control picture with a manikin on top or on the bottom * a correct response is followed by showing a video of the manikin moving in the correct direction (duration: 1000ms) * an incorrect response is followed by a red "X" in the middle of the screen (duration: 1000ms) ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ Instructions are the originals. To edit go to section Editable Instructions. ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ 14 alcohol related and 14 control pictures. !!! NOTE: The stimuli are culturally specific and may not work for a study outside the intended culture. To use your own images go to Editable Stimuli-> item.alcoholpics and item.controlpics and substitute your own. ___________________________________________________________________________________________________________________ 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: /responsekey_up = "Y" default label for the up key (used in instructions) /responsekey_down = "B" default label for the down key (used in instructions) /responsekey_left = "F" default label for the left key (used in instructions) /responsekey_right = "J" default label for the right key (used in instructions)