___________________________________________________________________________________________________________________ *SERIAL PROBE RECOGNITION TASK* ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 03-20-2015 last updated: 02-28-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-28-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script runs a Serial Probe Recognition Task, a memory task used for memory research with animal populations, e.g. Sands & Wright (1980). Sands, S. F., & Wright, A. A. (1980). Serial probe recognition performance by a rhesus monkey and a human with 10- and 20-item lists. Journal of Experimental Psychology: Animal Behavior Processes, 6, 386–396. The default set-up runs the procedure for people (no feedback markers are sent; positive auditory feedback for correct responses). To send feedback markers, please go to a) section Editable Values and set feedback durations and b) trial.feedback and follow further instructions. ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Computer presents lists of 10 picture stimuli; each stimuli is presented for 1s with a 800ms interstimulus interval in the top half of the computer monitor. 1s after the last list stimulus is presented, a probe is presented in the lower part of the computer monitor. Participants have 2s to decide whether the probe was part of the list. Half the probes are negative (the probe was not part of the list); half the probes are positive (the probe was part of the list) with each probe position (1-10) being represented equally often. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 35 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'serialproberecognition_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. currentprobeposition: stores the position of the probe in the set probestim: stores the itemnumber of the probestim stimulusitem: the presented stimuli in order of trial presentation response: the participant's response correct: the correctness of the response (1 = correct; 0 = incorrect) latency: the response latency (in ms) currentprobeposition: stores the position of the probe in the set probestim: stores the itemnumber of the probestim (2) Summary data file: 'serialproberecognition_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) propcorrect: overall proportion correct (across positive and negative probe trials) positive probe trial: probe is part of set negative probe trial: probe is not part of set propcorrect_negprobe: overall proportion correct for negative probe trials propcorrect_posprobe: overall proportion correct for positive probe trials propcorrect_probe1- propcorrect_probe10: proportion correct responses for positive probe trials; separate for each probeposition ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ 1 Block of 140 trial sequences * 70 positive probe trials (7 per each of the 10 probe positions) * 70 negative probe trials The order of negative and positive probes (and probe positions) are randomly determined. The items presented in each list are randomly selected. trial sequence * trial.start_positiveprobe/negativeprobe: resets crucial variables before each list starts and selects current probeposition * trial.stimpresentation_positiveprobe: presents the list of 10 stimuli (each pic is presented for 1000ms with an isi of 800ms) * trial.start_positiveprobe/negativeprobe: 1000ms after the last list item: presents the probe and waits for response for max.2000ms * trial.feedback: presents only positive audio feedback (4000hz sound) by default; to send feedback port information -> go to trial.feedback and follow further instructions ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ in this script: 210 images of animals, flowers, vegetables, and fruits (collected from the internet) - 140 of these get randomly selected to be the list stimuli => results in repeats of stimuli after 14 lists (of 10 items) have been presented (each item is repeated 10 times) => to avoid any repeats use: 1400 (+ 70 for the negative probes) list pictures for 140 trial sequences (or use shorter lists and/or fewer trials) - 70 (default: parameters.nr_trials/2) of these 210 stims are randomly selected to be the negative probes (these are not used for the lists) => no repeats of negative probes ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ generic instructions provided by Millisecond Software. To change, go to 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: /nr_stims: number of stimuli in a set Note: by default this script calculates summary variables for up to 10 possible probe positions Note: if this number is changed, go to list.probeposition and change possible probe positions /nr_trials: number of trials to run /stimduration: presentation duration of each of the stimuli in ms (default: 1000ms) /regular_isi: interstimulus interval between stimuli presentation in ms (default: 800ms) /last_isi: time between last stimulus and probe presentation in ms (default: 1000ms) /probeduration: duration of probe trial in ms (default: 2000ms) /getReadyDuration: duration (in ms) of get-ready trial (default: 5000ms) /iti: intertrial interval in ms (default: 500ms) /positivefeedbackduration: duration of positive feedback in ms (default: 200ms) /negativefeedbackduration: duration of negative feedback in ms Note: to send positive or negative feedback markers go to trial.feedback and follow instructions