Test library
47 tests across 6 cognitive domains, each scored automatically when it ends. 6 are on the free plan, 27 are timed, and 9 report a percentile against a published norm.
Measures basic processing speed by asking participants to respond as quickly as possible when a stimulus appears on screen.
Main score: Mean Reaction Time (ms)
Measures processing speed and visual-motor mapping by requiring rapid symbol-to-key matching under time pressure.
Main score: Throughput (correct/min)
Measures processing speed and visual scanning by asking participants to connect numbered circles in ascending order as quickly as possible.
Main score: Completion Time (ms)
Measures implicit sequence learning. One of four boxes lights up and participants press its key. A repeating 10-step sequence is replaced by a random block near the end, and the slowdown in that block shows how much of the sequence was learned.
Main score: Sequence Learning Effect (ms)
Measures attention and decision speed by requiring participants to select the correct response based on which stimulus appears.
Main score: Mean Reaction Time (ms)
Measures sustained attention by requiring rapid responses to infrequent visual targets over variable waiting intervals.
Main score: Mean Reaction Time (ms)
Measures sustained attention and vigilance by asking participants to detect target digit sequences in a rapid stream.
Main score: A-prime (score)
Measures sustained attention by asking participants to respond to target letters and withhold responses to non-target letters across a continuous stream.
Main score: d-Prime (d')
Measures selective visual attention by asking participants to detect a target among distractors across set sizes.
Main score: Conjunction Search Slope (ms/item)
Measures selective attention and cognitive control by requiring participants to identify the direction of a central arrow while ignoring flanking arrows.
Main score: Flanker Effect (ms)
Measures how quickly attention shifts to a location that briefly flashes. Response times to a dot in the flashed box (valid cue) are compared with the other box (invalid cue) and with trials where both boxes flash (neutral cue).
Main score: Orienting Cost (ms)
Measures sustained attention and response inhibition. Digits 1 to 9 appear at a fixed pace, and participants press for every digit except 3, which appears on about 11% of trials.
Main score: Commission Errors (count)
Measures working memory by requiring participants to indicate whether the current stimulus matches the one presented N items ago.
Main score: d-Prime (d')
Measures working memory by requiring participants to indicate whether the current stimulus matches the one presented N items ago.
Main score: d-Prime (d')
Measures verbal working memory capacity by asking participants to recall sequences of digits in forward and backward order.
Main score: Forward Span (score)
Measures visuospatial short-term and working memory by asking participants to reproduce sequences across a fixed nine-block layout.
Main score: Forward Span (score)
Measures spatial working memory and search strategy by asking participants to find hidden tokens in boxes while avoiding boxes where tokens were already found.
Main score: Between-Search Errors (count)
Measures mental rotation. Participants judge whether a turned shape is the same as an upright shape or its mirror image.
Main score: Rotation Slope (ms/degree)
Estimates visual working-memory capacity. Participants see 2 to 8 colored squares for 100 ms and, after a 900 ms blank, report whether one square changed color.
Main score: Capacity (Cowan's K) (items)
Measures working memory capacity with the automated operation span procedure. Participants check simple math problems while remembering letters, then recall the letters in order.
Main score: Partial Span Score (count)
Measures cognitive flexibility by asking participants to match cards by color or shape as the sorting rule changes.
Main score: Overall Accuracy (proportion)
Measures task-set switching by cueing participants to classify digits by parity or magnitude.
Main score: Switch Cost RT (ms)
Measures cognitive inhibition by asking participants to identify the ink color of color words, creating interference between reading and color naming.
Main score: Stroop Effect (ms)
Measures cognitive flexibility and attentional set-shifting with criterion-based discrimination, reversal, intra-dimensional shift, and extra-dimensional shift stages.
Main score: Stages Completed (count)
Measures executive function and cognitive flexibility by asking participants to alternate between numbers and letters (1-A-2-B-3-C...).
Main score: Completion Time (ms)
Measures planning by asking participants to judge the minimum number of moves needed to transform one Tower of London arrangement into another.
Main score: First-Choice Solved (count)
Measures nonverbal reasoning with 3 by 3 visual matrices generated for each session. Shapes change in number, size, rotation, fill and color by row and column rules.
Main score: Accuracy (proportion)
Measures interference from a location that is irrelevant to the task. Participants press the key for a red or blue square's color while the square appears left or right of center. Half of sessions use F for red and J for blue, the other half the reverse.
Main score: Simon Effect (ms)
Measures how much a delay lowers the value of money, using adjusting choices between an amount today and $100 later.
Main score: Area Under the Curve (proportion)
Measures reward learning and flexibility when the better of two symbols switches without warning.
Main score: Perseverative Errors (count)
Measures decision making under uncertainty with four card decks that differ in long-run gains and losses.
Main score: Net Score (count)
Measures risk taking as participants pump balloons for points and decide when to collect before a pop.
Main score: Adjusted Average Pumps (pumps)
Measures planning with Tower of London puzzles. Participants move three balls between pegs to match a goal in as few moves as possible.
Main score: Excess Moves (moves)
Measures letter fluency. Participants type as many words as they can that start with F, A and S, with 60 seconds per letter by default.
Main score: Unique Valid Words (count)
Captures command and optional copy clock drawings as timestamped browser-native strokes for reproducible process analysis.
Main score: Total Elapsed Time (ms)
Measures episodic recognition by asking participants to identify studied words among matched new words.
Main score: Recognition d-prime (score)
Measures delayed verbal recall and retention after an encoded word list and delay interval.
Main score: Delayed Recall (count)
Measures visuospatial episodic memory by asking participants to learn and recall the locations of patterns hidden in boxes on a grid.
Main score: Total Errors (count)
Measures visual recognition memory by showing a sample pattern, imposing a delay, then asking participants to identify the matching pattern among alternatives.
Main score: Percent Correct (proportion)
Measures visual pattern recognition by asking participants to recognize previously studied abstract patterns among novel foils.
Main score: Percent Correct (proportion)
Measures spatial recognition memory by asking participants to recognize previously presented screen locations.
Main score: Percent Correct (proportion)
Measures verbal episodic memory with a brief narrative, free recall, and recognition questions in the participant language.
Main score: Recognition Accuracy (proportion)
Measures list-learning across repeated study and recall trials, followed by recognition questions in the participant language.
Main score: Total Correct Recall (count)
Measures semantic category fluency. Participants type as many animals, and then fruits and vegetables, as they can, with 60 seconds per category by default.
Main score: Unique Valid Words (count)
Measures action cancellation by asking participants to make speeded left/right responses and withhold the response when a stop signal appears.
Main score: Stop-Signal Reaction Time (ms)
Measures response inhibition by requiring participants to respond to 'go' stimuli and withhold responses to 'no-go' stimuli.
Main score: d-Prime (d')
Measures affective response inhibition by asking participants to respond to words from one emotional valence while withholding responses to the other.
Main score: Affective Shift Cost (ms)
Compare simple responses with responses that require a choice.
7 minutes: Simple Reaction Time, Choice Reaction Time
A short free-tier battery for first runs, feasibility checks, and remote participant QA.
15 minutes: Simple Reaction Time, Choice Reaction Time, Eriksen Flanker Task, Stroop Color-Word Test
Designed for researchers measuring inhibition, conflict monitoring, and cognitive flexibility.
18 minutes: Go/No-Go Task, Stroop Color-Word Test, Eriksen Flanker Task, Trail Making Test B
A medium-length battery for working memory load, span, and associative learning experiments.
19 minutes: Digit Span Test, 1-Back Task, 2-Back Task, Paired Associate Learning
A comprehensive battery of language-free tests suitable for non-English-speaking participants. Covers attention, memory, processing speed, and executive function without requiring any verbal or reading ability.
30 minutes: Simple Reaction Time, Choice Reaction Time, Eriksen Flanker Task, Go/No-Go Task, Trail Making Test A, Trail Making Test B, 1-Back Task, Paired Associate Learning
A language-minimized battery for older adult remote cohorts, combining working memory, Trail Making A/B, and symbol coding with older-adult presentation defaults.
24 minutes: Digit Span Test, Trail Making Test A, Trail Making Test B, Symbol Coding
Longer guides cover the Trail Making Test and the n-back task. How percentiles work: test norms. Recruiting online: setup guides for Prolific, Sona, CloudResearch and Qualtrics.
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