___________________________________________________________________________________________________________________ INTERNATIONAL SHOPPING LIST TASK (ISLT) ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 01-12-2015 last updated: 07-25-2023 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 07-25-2023 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script runs the International Shopping List task; a task to assess memory functioning. The implemented procedure is based on: Thompson, T.A.C., Wilson, P.H., Snyder, P.J., Pietrzak, R.H., Darby, D., Maruff, P. & Herman Buschke, H. (2011). Sensitivity and Test–Retest Reliability of the International Shopping List Test in Assessing Verbal Learning and Memory in Mild Alzheimer’s Disease. Archives of Clinical Neuropsychology, 26, 412–424. ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Test administrator reads a list of 12 (default, editable 2-16 items) everyday shopping items to the test taker. The words appear on the computer screen. A new item is presented every 2s. The screen should only be facing the test administrator. Immediate Recall: (repeated 3 times) Immediately after the list is read to the test taker, the test taker is asked to recall the items from the shopping list. A screen with all the words as well as buttons for "other words", "undo last entry" and "finish" is visible to the test administator who selects each recalled word with the mouse. The words are ordered alphabetically for easier location. The last selected word can be undone by clicking the "undo last entry" button. If participant does not recall any more words, the "finish" button should be selected to finish the current round. Delayed Recall: optional (set Editable values -> parameters.run_delayedcondition == true) The procedure is almost the same as described for immediate recall with the exception that the recall screen is called after a delay. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 5 minutes (+ delay duration) to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'internationalshoppinglisttask_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) startedrounds: counts the number of times the task has been started nr_items: sets the number of items selected for the shopping list (default: 12) 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 stimulusitem: the presented stimuli in order of trial presentation recalledword: the recalled word response: the participant's response latency: the response latency (in ms) wordcount: number of words recalled (correct and incorrect); resets after each round count_word1- count_word16: counts how often each word of the shopping list was recalled (numbering refers to position of item in the shopping list; e.g. word1 was the first item presented to participant); resets after each round count_otherwords: counts how often non-list words are recalled for the current round (resets after each round) Note: repeating the same non-list word is counted as separate instances recalledlist: stores the items recalled in sequence (resets after each round) shoppinglist: stores the selected items from item.allwords that are selected for the actual shoppinglist (2) Summary data file: 'internationalshoppinglisttask_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) nr_items: the number of items selected for the shopping list (default: 12) completedrounds: counts the number of times the task has been completed max_freerecall: determines the Max possible free Recall sum for set nr items (per round) freerecall_round1: counts all correctly recalled words from Round1 freerecall_round2: counts all correctly recalled words from Round2 freerecall_round3: counts all correctly recalled words from Round3 max_totalfreerecall determines the Max possible total free Recall sum for the set nr items (across first 3 rounds; not including delayed) total_freerecall: determines the actual free Recall sum for the set nr items (across first 3 rounds; not including delayed) freerecall_delayed: counts all correctly recalled words from delayed run max_weightedfreerecall: determines the Max possible weighted free Recall sum for set nr items (per round) weightedrecall_round1: weighted sum of Recall scores from Round1 (weighted by: nr items - item position in shopping list + 1 => first item gets the most weight for recall) weightedrecall_round2: weighted sum of Recall scores from Round2 weightedrecall_round3: weighted sum of Recall scores from Round3 weightedrecall_delayed: weighted sum of Recall scores from delayed run nr_primacyrecency: determines the number of shopping list items counted towards Primacy and Receny recall. The number is either a third of the number of the shoppinglist items (rounded) or 4; whichever one is smaller. Example: number of items in shopping list = 10; 103 ~ 3 => Primacy and Recency Recall counts the first three items ( Primacy) and the last three items (Recency) max_primacyrecency: determines the Max possible PrimacyRecency values for the set nr items (across first 3 rounds) primacy: sums up the number of Primacy list words recalled for the first three rounds (excluding delayed round) Note: number of items counting to towards Primacy is predetermined by nr_PrimacyRecency recency: sums up the number of Recency list words recalled for the first three rounds (excluding delayed round) The number is either a third of the number of shoppinglist items (rounded) or 4; whichever one is smaller. Example: number of items in shopping list = 10; 103 ~ 3 => Primacy and Recency Recall counts the first three items ( Primacy) and the last three items (Recency) intrusion: sums up the number of non-list words recalled across the first three rounds (excluding Delayed Round) repetition: sums up the number of repeated list words across the first three rounds (excluding Delayed Round) shoppinglist: stores the selected items from item.allwords that are selected for the actual shoppinglist recalledlist1- recalledlist_delayed: stores the items recalled in sequence separately for each round ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ The script runs 1. block select_shoppinglist => selects the items for the shopping list (item number depends on parameters.nr_items -> Editable Values) (selection is done randomly). 2. 3 immediate recall runs of: block.present_shoppinglist followed immediately by the appropriate block.recall_shoppinglist block.present_shoppinglist: presents the items of the shopping list one by one in the same order. A new word is presented every 2s (default; can be edited under Editable Values -> parameters.wordpresentationtime). Computer should face away from test taker. Test administrator reads the words out loud. Order of shopping list items presented stays the same for all rounds of testing. block.recall_shoppinglist: The interface shows buttons for every word in the shopping list in ALPHABETICAL order as well as buttons for 'other words', 'undo last entry', and 'finish'. A counter on the top of the screen counts the number of selected items out of the total number of items in the shopping list (e.g. 4/12). The screen should face away from test taker. Test administrator selects with the mouse the recalled items. If the wrong item is selected, the selection can be undone by clicking 'undo last entry'. Once test taker stops recalling items, test administrator selects 'finish'. 3. An optional delayed recall run (depends on setting of editable value parameters.run_delayedcondition) ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ 120 shopping list items are listed under Editable Code->Editable Stimuli-> item.allwords The shopping list items are highly culturally dependent and should be relevant/meaningful for the current test taker. The provided items are only suggestions by Millisecond Software and should be carefully evaluated and edited. The provided items are untested. ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ Instructions are provided by Millisecond Software. They can easily be changed under Editable Code->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: /nr_items: sets the number of items selected for the shopping list (default: 12) /wordpresentationtime: sets the word presentation time in ms (default: 2000 => 2s per words /run_delayedcondition: true = runs a delayed recall condition after the 3 immediate recall conditions (default) false = does not run the delayed recall condition after the 3 immediated recall conditions /fontsize_target: sets the height of the font of the words presented on screen in screen height percentages (default: 8%)