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P3a from visual stimuli: task difficulty effects.
Int J Psychophysiol. 2006 Jan; 59(1):8-14.IJ

Abstract

The P3a event-related brain potential (ERP) was elicited using a visual three-stimulus oddball paradigm (target, standard, distracter) in which participants responded only to the target. Discrimination task difficulty between the target and the standard was manipulated by varying the size of the standard stimulus circle relative to a constant target stimulus circle across three conditions (easy, medium, hard). A large checkerboard pattern was employed for the distracter stimulus across all tasks. Error rate and response time increased with increases in task difficulty, so that the task difficulty manipulation was successful. Distracter P3a amplitude increased and target P3b decreased somewhat with increases in task difficulty. The findings suggest that increased perceptual discrimination difficulty between the target and standard stimuli increases P3a amplitude. Theoretical implications are discussed.

Authors+Show Affiliations

Department of Psychology, University of California, San Diego, La Jolla, CA 92093, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

16253363

Citation

Hagen, Galen F., et al. "P3a From Visual Stimuli: Task Difficulty Effects." International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology, vol. 59, no. 1, 2006, pp. 8-14.
Hagen GF, Gatherwright JR, Lopez BA, et al. P3a from visual stimuli: task difficulty effects. Int J Psychophysiol. 2006;59(1):8-14.
Hagen, G. F., Gatherwright, J. R., Lopez, B. A., & Polich, J. (2006). P3a from visual stimuli: task difficulty effects. International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology, 59(1), 8-14.
Hagen GF, et al. P3a From Visual Stimuli: Task Difficulty Effects. Int J Psychophysiol. 2006;59(1):8-14. PubMed PMID: 16253363.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - P3a from visual stimuli: task difficulty effects. AU - Hagen,Galen F, AU - Gatherwright,James R, AU - Lopez,Brian A, AU - Polich,John, Y1 - 2005/10/25/ PY - 2005/06/23/received PY - 2005/08/23/accepted PY - 2005/10/29/pubmed PY - 2006/3/31/medline PY - 2005/10/29/entrez SP - 8 EP - 14 JF - International journal of psychophysiology : official journal of the International Organization of Psychophysiology JO - Int J Psychophysiol VL - 59 IS - 1 N2 - The P3a event-related brain potential (ERP) was elicited using a visual three-stimulus oddball paradigm (target, standard, distracter) in which participants responded only to the target. Discrimination task difficulty between the target and the standard was manipulated by varying the size of the standard stimulus circle relative to a constant target stimulus circle across three conditions (easy, medium, hard). A large checkerboard pattern was employed for the distracter stimulus across all tasks. Error rate and response time increased with increases in task difficulty, so that the task difficulty manipulation was successful. Distracter P3a amplitude increased and target P3b decreased somewhat with increases in task difficulty. The findings suggest that increased perceptual discrimination difficulty between the target and standard stimuli increases P3a amplitude. Theoretical implications are discussed. SN - 0167-8760 UR - https://www.unboundmedicine.com/medline/citation/16253363/P3a_from_visual_stimuli:_task_difficulty_effects_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0167-8760(05)00226-6 DB - PRIME DP - Unbound Medicine ER -