Intentional Binding Task (Web)

Field	Value
ID	H000085
Canonical source	T000085-intentional-binding-task
Version	v0.1.0
Runtime	psyflow-web / jsPsych
Language	Chinese

Overview

Browser-native port of the canonical four-condition Intentional Binding Task. Participants watch a 60-position Libet clock whose red hand rotates once every 2.5 seconds, make or observe an event, and click the clock position at which they perceived the judged action or tone.

Conditions

Condition	Action	Tone	Judged event
baseline_action	voluntary space press	no	action
baseline_tone	no	computer tone	tone
operant_action	voluntary space press	200 ms later	action
operant_tone	voluntary space press	200 ms later	tone

Each condition contains 6 practice and 30 scored trials. Block order is deterministically shuffled per participant. The canonical 1.0 s warning, 0.5 s fixation, 0.5 s stationary clock, 6.0 s action ceiling, 0.2-2.0 s baseline-tone latency, 1000 Hz / 100 ms tone, 2.0 s post-critical-event clock interval, 15 s pointer report, and 0.5 s ITI are retained.

Web implementation

• main.ts owns participant-seeded block order, practice/scored orchestration, and the final summary.
• src/run_trial.ts mirrors the canonical warning-to-ITI trial lifecycle and emits one reduced logical row.
• src/utils.ts owns condition decoding, deterministic nuisance sampling, the continuous animated SVG clock, circular errors, and summary metrics.
• config/config.yaml is synchronized from T000085; only web asset paths, font fallbacks, and the browser trigger driver differ.
• Pointer targets are 60 transparent circles aligned to the 0-59 clock positions.

Measures

Each logical trial exports condition, block/practice status, action response and RT, tone/critical-event elapsed time, actual and reported clock position, shortest signed circular error, error in milliseconds, and validity. One clock unit equals 41.667 ms.

Run and validation

Run through the shared psyflow-web application:

cd ..\psyflow-web
npm run dev

Open /?task=H000085-intentional-binding-task.

Task-local typecheck:

npx tsc --noEmit -p ..\H000085-intentional-binding-task\tsconfig.json

See transfer_node.md and references/task_py2js_alignment.md for the transfer audit.