___________________________________________________________________________________________________________________ *Leeds Food Preference Questionnaire (LFPQ)* ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 10-08-2021 last updated: 01-02-2023 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 01-02-2023 Millisecond Software Millisecond Software thanks Dr. Graham Finlayson for his collaboration on this script! ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements the Leeds Food Preference Questionnaire (LFPQ), a computer-based procedure to measure explicit and implicit food preferences. The original e-prime script is available at: https://licensing.leeds.ac.uk/product/leeds-food-preference-questionnaire-lfpq Reference Finlayson, G., King, N., & Blundell, J. (2008), The role of implicit wanting in relation to explicit liking and wanting for food: implications for appetite control, Appetite, 50(1), 120-127 ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participants are presented with an array of pictures of sweet and savory food items high and low in fat. They work on 2 different tasks: - explicit (FPQ): participants liking and wanting states are assessed as VAS ratings (scale: 0-100) - implicit (FCQ): participants preferences are assessed via a forced-choice task with choices and choiceRTs The two tasks are run in random order. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 10 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'lfpq_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. taskPresentationOrder: the order in which (FPQ_L, FPQ_W) and FCQ tasks are run phase: ApVAS_pre, instructions, practice, test, ApVAS_post procedure: 'fpq practice', 'fcq practice', from e-prime script: 'fpqL01', 'fpqW01', 'fcq001' condition: FPQ: the condition of the image presented (hfsa, hfsw, lfsa, lfsw) FCQ: the conditions of the image pairs presented (Example: lfswlfsa) hfsa => high fat savory; lfsa => low fat savory; hfsw => high fat sweet; lfsw => low fat sweet order: each image has a particular index number, order refers to this index number FPQ_image: the particular image shown in the current FPQ condition FCQ_image_left: the particular left image shown in the current FCQ condition FCQ_image_right: the particular right image shown in the current FCQ condition response (built-in variable): FPQ: simply shows 'customslider' (= participant pressed somewhere on the slider) FCQ: stores the scancode of the pressed response key => 32 = D (left); 36 = J (right) taskResponse: FPQ: stores the VAS value (0-100) selected FCQ: stores the selected image condition latency (built-in variable): the response latency (in ms); measured from onset of images (2) Summary data file: 'lfpq_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) taskPresentationOrder: the order in which (FPQ_L, FPQ_W) and FCQ tasks were run //ApVAS ratings: Hungry_ApVAS_pre: pre-rating (0-100) for ApVAS 'HungryNow' Full_ApVAS_pre: pre-rating (0-100) for ApVAS 'FullNow' Urge_ApVAS_pre: pre-rating (0-100) for ApVAS 'UrgeNow' Hungry_ApVAS_post: post-rating (0-100) for ApVAS 'HungryNow' Full_ApVAS_post: post-rating (0-100) for ApVAS 'FullNow' Urge_ApVAS_post: post-rating (0-100) for ApVAS 'UrgeNow' //FPQ (explicit): FPQ_L_meanRating_HFSA: mean FPQ Liking rating (0-100) for HFSA (high fat savory items) FPQ_L_meanRating_HFSW: mean FPQ Liking rating (0-100) for HFSW (high fat sweet items) FPQ_L_meanRating_LFSA: mean FPQ Liking rating (0-100) for LHFSA (low fat savory items) FPQ_L_meanRating_LFSW: mean FPQ Liking rating (0-100) for LFSW (low fat sweet items) FPQ_W_meanRating_HFSA: mean FPQ Wanting rating (0-100) for HFSA (high fat savory items) FPQ_W_meanRating_HFSW: mean FPQ Wanting rating (0-100) for HFSW (high fat sweet items) FPQ_W_meanRating_LFSA: mean FPQ Wanting rating (0-100) for LHFSA (low fat savory items) FPQ_W_meanRating_LFSW: mean FPQ Wanting rating (0-100) for LFSW (low fat sweet items) //FCQ (implicit): FCQ_countHFSA: number of times HFSA (high fat savory items) were chosen during the FCQ task FCQ_propHFSA: proportion of times HFSA items were chosen if they were presented FCQ_meanChoiceRT_HFSA: mean choice reaction time to choose HFSA items (same for HFSW, LFSA, LFSW items) * separate data files: to change to one data file for all participants (on Inquisit Lab only), go to section "DATA" and follow further instructions ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ Modules: 1. Start: 1 slide 2. ApVASProc_pre: 3 VAS questions (sequential selection) - hungry now - urge now - full now 3. Main Menu: includes optional instruction block, optional practice session and the test session - gives the option to run an instruction block - gives the option to run the practice session as stand-alone session (order of tasks to practice can be selected; practice blocks can be skipped) - practice blocks run 4 practice trials per each task (QPF, QCF) - test session: (mandatory) - test randomizes the order of the FPQ and FCQ tasks - FPQ: separated into two blocks FPQ_l and FPQ_w; each of them run 16 trials (order randomized); a rest block is run in between the two runs - FCQ: 96 trials, separated into 3 runs (rest blocks in between) - both tasks start with the 4 practice trials (the same as run in the stand-alone practice session) 4. ApVASProc_post: 3 VAS questions (sequential selection) - hungry now - urge now - full now 5. End: 1 slide ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ The food stimuli run are provided with the original e-prime script. https://licensing.leeds.ac.uk/product/leeds-food-preference-questionnaire-lfpq HFSA => high fat savory; LFSA => low fat savory; HFSW => high fat sweet; LFSW => low fat sweet ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ The instructions run are provided with the original e-prime script. https://licensing.leeds.ac.uk/product/leeds-food-preference-questionnaire-lfpq Notes: * the instructions were translated into English from the French instructions by K.Borchert for Millisecond Software. Task instructions were taken from Finlayson et al(2008). * if the current script is run on touchscreens (with no mouse), the instructions adapt. This was not part of the original program