PEBL Test Library

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Choice Reaction Time screenshot

Choice Reaction Time

Processing Speed ~4 min
A simple choice reaction time task where participants type the letter displayed on screen as quickly as possible. Measures basic processing speed and response selection.
Digit-Symbol Substitution Test screenshot

Digit-Symbol Substitution Test

Processing Speed ~5 min
A processing speed and associative learning task requiring participants to match symbols with digits or letters with digits using a mapping key displayed on screen.
Four-Choice Serial Response Time screenshot

Four-Choice Serial Response Time

Processing Speed ~4 min
A four-choice serial reaction time task from the UTC test battery (Wilkinson & Houghton, 1975). A plus sign appears in one of four screen quadrants, and participants press the corresponding key as quickly as possible. Optional auditory feedback for lapses.
Hick's Law Task screenshot

Hick's Law Task

Processing Speed ~7 min
Demonstration of Hick's Law showing that reaction time increases logarithmically with the number of response choices
Line Judgment Task screenshot

Line Judgment Task

Processing Speed ~10 min
A speed-accuracy tradeoff task based on Henmon (1910) where participants quickly discriminate which of two vertical lines is longer under varying deadline conditions.
Math Processing Task screenshot

Math Processing Task

Processing Speed ~10 min
A timed arithmetic verification task based on the UTC test battery. Participants solve simple addition and subtraction problems and judge whether the answer is greater or less than 5.
Pattern Comparison (Same/Different) screenshot
A go/no-go pattern comparison task where two dot patterns are presented simultaneously and participants press the spacebar if they match the target condition.
Pattern Comparison (Sequential) screenshot

Pattern Comparison (Sequential)

Processing Speed ~8 min
A sequential pattern comparison task where participants memorize a dot pattern and then judge whether a second pattern is the same or different.
Simple Reaction Time screenshot

Simple Reaction Time

Processing Speed ~6 min
A simple reaction time task where a single stimulus (an 'X' or mouse button prompt) appears at a specifiable delay from the previous response. Measures basic alertness and motor response speed across multiple blocks with breaks.
Two-Column Addition Test screenshot

Two-Column Addition Test

Processing Speed ~10 min
Mental arithmetic task requiring rapid addition of three two-digit numbers presented vertically