Continuous Performance Task

HED Task ID: hedtsk_continuous_performance

Also known as: CPT, CPT-II, AX-CPT variant also separate entry

Extended stream of stimuli in which a rare target requires a response; omission and commission errors index sustained attention and response control.

Description

The Continuous Performance Task requires participants to continuously monitor a stream of stimuli and respond selectively to infrequent target stimuli while withholding responses to non-targets over an extended period (5-15 minutes). The standard version involves responding when the letter “X” appears; the AX-CPT variant requires responding only when “A” is immediately followed by “X.” Target frequency is typically 5-25% of trials. Performance measures include hit rate, false alarm rate, d’ (sensitivity), and vigilance decrement over time. The task is widely used in ADHD research and clinical neuropsychology.

Inclusion test

Procedure

A rapid sequence of stimuli is presented; participants respond to infrequent target stimuli and withhold responses to non-targets over a prolonged session (10–20 min).

Manipulation

Target probability; stimulus presentation rate (ISI); session duration; signal type (letters, digits, tones).

Measurement

Hit rate, false alarm rate, d-prime (sensitivity); commission errors (impulsivity); omission errors (inattention); RT variability.

Variations

Variation

Description

Justification

X-CPT (Simple)

Respond to target letter “X” among non-target letters; measures basic sustained attention.

Respond to single target letter; canonical simple vigilance paradigm

AX-CPT (Context Processing)

Respond to “X” only when preceded by “A”; probes context maintenance and proactive/reactive control.

Context-dependent target requires tracking A→X sequence; different working memory demand

Identical Pairs CPT (IP-CPT)

Respond when two consecutive stimuli are identical; taps working memory updating.

Respond when consecutive stimuli match; different stimulus-response rule

Gradual-Onset CPT (gradCPT)

Scene images fade in/out continuously; respond to one category, withhold to another; naturalistic sustained attention.

Stimuli gradually transition instead of discrete flashes; different perceptual and decision dynamics

Auditory CPT

Auditory stimulus stream; respond to target phoneme or tone.

Auditory stimulus stream instead of visual; different sensory modality

Conners’ CPT-3

Standardized commercial version with norms for ADHD assessment.

Standardized commercial CPT with letter stimuli and specific timing; named published instrument

TOVA (Test of Variables of Attention)

Commercial CPT variant with specific timing parameters and normative data.

Geometric stimuli, fixed ISI; distinct named instrument with different timing parameters

CPT with Emotional Distractors

Task-irrelevant emotional stimuli during sustained attention.

Emotional stimuli as distractors; retained per §5.1 (EMOT retired)

Cognitive processes

This task engages the following cognitive processes:

Key references

  • {‘authors’: ‘Rosvold, H. E., Mirsky, A. F., Sarason, I., Bransome, E. D., & Beck, L. H.’, ‘year’: 1956, ‘title’: ‘A continuous performance test of brain damage.’, ‘venue’: ‘Journal of Consulting Psychology’, ‘venue_type’: ‘journal’, ‘journal’: ‘Journal of Consulting Psychology’, ‘volume’: ‘20’, ‘issue’: ‘5’, ‘pages’: ‘343-350’, ‘doi’: ‘10.1037/h0043220’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Rosvold, H. E., Mirsky, A. F., Sarason, I., Bransome, E. D., & Beck, L. H. (1956). A continuous performance test of brain damage. Journal of Consulting Psychology, 20(5), 343-350.’, ‘url’: ‘https://doi.org/10.1037/h0043220’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}

  • {‘authors’: ‘Nuechterlein, K. H., Parasuraman, R., & Jiang, Q.’, ‘year’: 1983, ‘title’: ‘Visual Sustained Attention: Image Degradation Produces Rapid Sensitivity Decrement Over Time’, ‘venue’: ‘Science’, ‘venue_type’: ‘journal’, ‘journal’: ‘Science’, ‘volume’: ‘220’, ‘issue’: ‘4594’, ‘pages’: ‘327-329’, ‘doi’: ‘10.1126/science.6836276’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Nuechterlein, K. H., Parasuraman, R., & Jiang, Q. (1983). Visual sustained attention: Image degradation produces rapid sensitivity decrement over time. Science, 220(4594), 327-329.’, ‘url’: ‘https://doi.org/10.1126/science.6836276’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}

  • {‘authors’: ‘Carter, C. S., Braver, T. S., Barch, D. M., Botvinick, M. M., Noll, D., & Cohen, J. D.’, ‘year’: 1998, ‘title’: ‘Anterior Cingulate Cortex, Error Detection, and the Online Monitoring of Performance’, ‘venue’: ‘Science’, ‘venue_type’: ‘journal’, ‘journal’: ‘Science’, ‘volume’: ‘280’, ‘issue’: ‘5364’, ‘pages’: ‘747-749’, ‘doi’: ‘10.1126/science.280.5364.747’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Carter, C. S., Braver, T. S., Barch, D. M., Botvinick, M. M., Noll, D., & Cohen, J. D. (1998). Anterior cingulate cortex, error detection, and the online monitoring of performance. Science, 280(5364), 747-749.’, ‘url’: ‘https://doi.org/10.1126/science.280.5364.747’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}

Recent references

  • {‘authors’: ‘Huang-Pollock, C. L., Karalunas, S. L., Tam, H., & Moore, A. N.’, ‘year’: 2012, ‘title’: ‘Evaluating vigilance deficits in ADHD: A meta-analysis of CPT performance.’, ‘venue’: ‘Journal of Abnormal Psychology’, ‘venue_type’: ‘journal’, ‘journal’: ‘Journal of Abnormal Psychology’, ‘volume’: ‘121’, ‘issue’: ‘2’, ‘pages’: ‘360-371’, ‘doi’: ‘10.1037/a0027205’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Huang-Pollock, C. L., Karalunas, S. L., Tam, H., & Moore, A. N. (2012). Evaluating vigilance deficits in ADHD: A meta-analysis of CPT performance. Journal of Abnormal Psychology, 121(2), 360–371.’, ‘url’: ‘https://doi.org/10.1037/a0027205’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}

  • {‘authors’: ‘Rosenberg, M., Noonan, S., DeGutis, J., & Esterman, M.’, ‘year’: 2013, ‘title’: ‘Sustaining visual attention in the face of distraction: a novel gradual-onset continuous performance task’, ‘venue’: ‘Attention, Perception, & Psychophysics’, ‘venue_type’: ‘journal’, ‘journal’: ‘Attention, Perception, & Psychophysics’, ‘volume’: ‘75’, ‘issue’: ‘3’, ‘pages’: ‘426-439’, ‘doi’: ‘10.3758/s13414-012-0413-x’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Esterman, M., Noonan, S. K., Rosenberg, M., & DeGutis, J. (2013). In the zone or zoning out? Tracking behavioral and neural fluctuations during sustained attention. Cerebral Cortex, 23(11), 2712–2723.’, ‘url’: ‘https://doi.org/10.3758/s13414-012-0413-x’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}

  • {‘authors’: ‘Fortenbaugh, F. C., DeGutis, J., & Esterman, M.’, ‘year’: 2017, ‘title’: ‘Recent theoretical, neural, and clinical advances in sustained attention research’, ‘venue’: ‘Annals of the New York Academy of Sciences’, ‘venue_type’: ‘journal’, ‘journal’: ‘Annals of the New York Academy of Sciences’, ‘volume’: ‘1396’, ‘issue’: ‘1’, ‘pages’: ‘70-91’, ‘doi’: ‘10.1111/nyas.13318’, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Fortenbaugh, F. C., DeGutis, J., & Esterman, M. (2017). Recent theoretical, neural, and clinical advances in sustained attention research. Annals of the New York Academy of Sciences, 1396(1), 70–91.’, ‘url’: ‘https://doi.org/10.1111/nyas.13318’, ‘source’: ‘crossref’, ‘confidence’: ‘high’, ‘verified_on’: ‘2026-04-20’}

  • {‘authors’: ‘Weigard, A., & Huang-Pollock, C.’, ‘year’: 2017, ‘title’: ‘The role of speed in ADHD-related working memory deficits: A time-based resource-sharing and diffusion model account’, ‘venue’: ‘Clinical Psychological Science’, ‘venue_type’: ‘journal’, ‘journal’: ‘Clinical Psychological Science’, ‘volume’: ‘5’, ‘issue’: ‘2’, ‘pages’: ‘195–211’, ‘doi’: None, ‘openalex_id’: None, ‘pmid’: None, ‘citation_string’: ‘Weigard, A., & Huang-Pollock, C. (2017). The role of speed in ADHD-related working memory deficits: A time-based resource-sharing and diffusion model account. Clinical Psychological Science, 5(2), 195–211.’, ‘url’: None, ‘source’: ‘unresolved’, ‘confidence’: ‘none’, ‘verified_on’: ‘2026-04-20’}