What this task measures
Measures sustained attention by requiring rapid responses to infrequent visual targets over variable waiting intervals.
Core constructs
- Sustained attention
- Vigilance stability
- Fatigue sensitivity
- Alertness regulation
Research fit
- Sleep deprivation studies
- Fatigue monitoring in shift-work cohorts
- Medication sedation profiling
- Longitudinal attention stability tracking
Why researchers use ConductCognition
- Hosted browser delivery with no local install burden for participants.
- Study setup, scoring, exports, and participant links in one workflow.
- Transparent pricing instead of opaque enterprise quoting for solo labs.
- Free entry tier plus Academic Pro when you need the full battery and raw exports.
Paradigm overview
The Psychomotor Vigilance Task (PVT) measures sustained attention by requiring immediate responses to infrequent visual targets after unpredictable waiting intervals. This structure minimizes strategic anticipation and isolates vigilance decline over time.
Unlike short burst reaction-time paradigms, PVT emphasizes attentional stability. A participant may begin with fast responses but accumulate lapses (very slow or missed responses) as fatigue, sleep pressure, or reduced alertness increases.
The PVT is widely used in sleep, fatigue, and operational-performance research because lapse counts and response variability are highly sensitive to vigilance impairment.
Key scoring outputs
Mean Reaction Time
msAverage valid response latency across scored trials.
Lower is better
Median Reaction Time
msMedian response latency, less influenced by outlier lapses.
Lower is better
RT Standard Deviation
msIntraindividual variability of response speed.
Lower is better
Lapses
countMissed responses or responses slower than the lapse threshold.
Lower is better
False Starts
countAnticipatory responses under 100ms.
Lower is better
Response Rate
proportionProportion of trials with any response before timeout.
Higher is better
Normative and citation context
No platform-matched normative source is currently seeded for this task in ConductCognition.
Scores are suitable for raw and longitudinal research analysis under controlled conditions.
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