Stop-Signal Task
Participants perform a speeded go task and, on a minority of trials, a stop signal appears after the go stimulus at a variable stop-signal delay (SSD), instructing them to cancel the already-initiated response. Whether the response is cancelled depends on a race between a go process and a stop process; the latency of the stop process — the stop-signal reaction time (SSRT) — is estimated under the race model and is the primary index of response inhibition. The SSD is typically tracked by a staircase that converges on ~50% successful stopping.
- Defining contrast
ssrt (race-model)- Family
- stop-signal
- Human review
- sourced — unreviewed
- Executable test
- verify:task — an implementation can be driven and judged against this spec
- Schema
- spec version 3
- Catalog entry
- Stop-Signal Task in the paradigm catalog
Where this spec stands
This record is sourced. The ladder below is the human-review axis
only — a passing executable test never moves a record up it.
sourcedLiterature-linked, drafted with LLM assistance or by a contributor, and unreviewed. The honest default.corroboratedIndependently cross-checked against the cited sources, but not signed by a named expert.expert-annotatedAll three claims attested by named experts. Derived, never self-declared.contestedA named expert disputes at least one claim. A real outcome, kept visible.
Implementations driven through this spec
| Implementation | Platform | Verdict | Note |
|---|---|---|---|
| TaskBeacon H000012-sst | psyflow-web / jsPsych | conforms |
Origin reference
- Logan, G. D., & Cowan, W. B. (1984). On the ability to inhibit thought and action: A theory of an act of control. Psychological Review, 91(3), 295-327. doi:10.1037/0033-295X.91.3.295
Review this specification
Three separable claims: does the contrast identify the paradigm, is it a defensible measure of the named construct, and are the psychometric numbers correctly conditioned? Attest one, contest another — a split outcome is a real result.