___________________________________________________________________________________________________________________ Lexical Decision Task ___________________________________________________________________________________________________________________ last updated: 02-24-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-24-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a simple Lexical Decision Task to investigate semantic memory and lexical access. The implemented procedure is based on: Lepore & Brown (2002), The Role of Awareness: Divergent Automatic Stereotype Activation and Implicit Judgment Correction, Social Cognition, 20 (4), pp 321-351. This script uses placeholders for actual stimuli. ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participants are asked to categorize words into words and nonwords by pressing the E-key (non words) or I-key (words) as fast as possible when a word/nonword stimulus appears on screen. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 3 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'lexicaldecisiontask_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. condition: "Category Word", "Neutral Word", "Non Word" presentedStim: the currently presented word or non-word response: the participant's response (scancode of response button) 18 = E (non word) 23 = I (word) 57 = spacebar correct: the correctness of the response (1 = correct; 0 = incorrect) latency: the response latency (in ms); latency measured from onset of stimulus (2) Summary data file: 'lexicaldecisiontask_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 all testtrials MeanRT: overall mean latency of correct responses across all correct testtrials STD: overall standard deviation of correct latencies MedianRT: overall median latency of correct responses across all correct testtrials PropCorrect_CatW: proportion correct of responses to category words MeanRT_CatW: mean latency of correct responses to category words STD_CatW: standard deviation of correct responses to category words MedianRT_CatW: median latency of correct responses to category words PropCorrect_NeutralW proportion correct of responses to neutral words MeanRT_NeutralW: mean latency of correct responses to neutral words STD_NeutralW: standard deviation of correct responses to neutral words MedianRT_NeutralW: median latency of correct responses to neutral words PropCorrect_NonW: proportion correct of responses to non words MeanRT_NonW: mean latency of correct responses to non words STD_NonW: standard deviation of correct responses to non words MedianRT_NonW: median latency of correct responses to non words ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ 3 types of words (category words, neutral words, nonwords) tested within participants in a mixed design 1 Practice Block: 6 trials (3 neutral words, 3 nonwords; order randomly selected) 1 Test Block: 52 trials (13 category words, 13 neutral words, 26 non words; order and stimuli randomly selected) Trial Sequence: * (for 700ms) -> stimulus (250ms) -> blank screen until response (latency measured from onset of stimulus) (Durations can be edited under section Editable Parameters) ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ are spaceholders - actual stimuli can be easily inserted under section Editable Stimuli ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ can be edited under 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: /fixationDuration: the duration (in ms) of the fixation stimulus presented at the start of each trial (default: 700ms) /stimDuration: the duration (in ms) of the presented word/nonword in ms (default: 250ms) /stimSize: the proportional height (to active canvas) of the stimuli (default: 5%)