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Underlying mechanisms of the P3a task-difficulty effect.
Psychophysiology. 2008 Sep; 45(5):731-41.P

Abstract

In three-stimulus oddball studies, even typical deviant stimuli elicited a large P3a event-related brain potential (ERP) when target/standard discrimination was difficult. To investigate the underlying mechanisms, the effects of task difficulty on early deviant-related ERPs were assessed. Four visual stimuli defined by an orthogonal combination of task-relevant size (nontarget 80%, target 20%) and task-irrelevant luminance (standard 80%, deviant 20%) were presented randomly, where two task difficulties (easy, difficult) were defined by target/nontarget discriminability. An increase in task difficulty enhanced P3a as well as a posterior negativity (change-related negativity) and an anterior positivity (frontal positivity) elicited by deviant nontarget stimuli. These results suggest that attentional modulation of refractoriness-based rareness detection and an attention-triggering process underlie the P3a task-difficulty effect.

Authors+Show Affiliations

Graduate School of Education, Hokkaido University, Sapporo, Japan. m-kimura@edu.hokudai.ac.jpNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18665864

Citation

Kimura, Motohiro, et al. "Underlying Mechanisms of the P3a Task-difficulty Effect." Psychophysiology, vol. 45, no. 5, 2008, pp. 731-41.
Kimura M, Katayama J, Murohashi H. Underlying mechanisms of the P3a task-difficulty effect. Psychophysiology. 2008;45(5):731-41.
Kimura, M., Katayama, J., & Murohashi, H. (2008). Underlying mechanisms of the P3a task-difficulty effect. Psychophysiology, 45(5), 731-41. https://doi.org/10.1111/j.1469-8986.2008.00684.x
Kimura M, Katayama J, Murohashi H. Underlying Mechanisms of the P3a Task-difficulty Effect. Psychophysiology. 2008;45(5):731-41. PubMed PMID: 18665864.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Underlying mechanisms of the P3a task-difficulty effect. AU - Kimura,Motohiro, AU - Katayama,Jun'ichi, AU - Murohashi,Harumitsu, Y1 - 2008/07/24/ PY - 2008/7/31/pubmed PY - 2008/11/15/medline PY - 2008/7/31/entrez SP - 731 EP - 41 JF - Psychophysiology JO - Psychophysiology VL - 45 IS - 5 N2 - In three-stimulus oddball studies, even typical deviant stimuli elicited a large P3a event-related brain potential (ERP) when target/standard discrimination was difficult. To investigate the underlying mechanisms, the effects of task difficulty on early deviant-related ERPs were assessed. Four visual stimuli defined by an orthogonal combination of task-relevant size (nontarget 80%, target 20%) and task-irrelevant luminance (standard 80%, deviant 20%) were presented randomly, where two task difficulties (easy, difficult) were defined by target/nontarget discriminability. An increase in task difficulty enhanced P3a as well as a posterior negativity (change-related negativity) and an anterior positivity (frontal positivity) elicited by deviant nontarget stimuli. These results suggest that attentional modulation of refractoriness-based rareness detection and an attention-triggering process underlie the P3a task-difficulty effect. SN - 0048-5772 UR - https://www.unboundmedicine.com/medline/citation/18665864/Underlying_mechanisms_of_the_P3a_task_difficulty_effect_ L2 - https://doi.org/10.1111/j.1469-8986.2008.00684.x DB - PRIME DP - Unbound Medicine ER -