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Target-to-target interval influences a range of erp components

Journal Article


Abstract


  • The amplitude of the late positive complex (LPC) of the event-related potential (ERP) is

    influenced by the target-to-target interval (TTI), with increases in TTI systematically

    enhancing LPC amplitudes. This study explored whether other ERP component amplitudes

    are affected by TTI in a similar manner. Electroencephalographic activity was recorded

    from 27 participants in a three-stimulus visual oddball task with equiprobable targets and

    infrequent nontargets, and frequent standards. We manually identified component peak

    amplitudes relative to a 100 ms prestimulus baseline. The selection of these amplitudes

    was confirmed with a temporal principal components analysis. As hypothesised, LPC

    amplitudes were enhanced by longer TTIs. P2 evidenced a similar response profile, where

    increases in TTI linearly augmented P2 amplitudes. However, the same pattern of results

    was not apparent for N1, where amplitudes were not affected by interval. It was also found

    that N2 amplitude decreased as TTI increased. Taken together, these results suggest that

    some exogenous ERP components are responsive to changes in the timing of target stimuli

    in a similar fashion to that of the later endogenous component, the LPC. Hence, it could

    be argued that TTI variation influences the attention and working memory systems

    involved in processing target stimuli. Implications are discussed in relation to context-

    update and context-closure theories.

Publication Date


  • 2012

Citation


  • Steiner, G., Gonsalvez, C. J., Barry, R. J., De Blasio, F. & Brennan, M. (2012). Target-to-target interval influences a range of erp components. Psychophysiology: an international journal, 49 (Supplement s1), S53-S53.

Ro Metadata Url


  • http://ro.uow.edu.au/sspapers/58

Start Page


  • S53

End Page


  • S53

Volume


  • 49

Issue


  • Supplement s1

Abstract


  • The amplitude of the late positive complex (LPC) of the event-related potential (ERP) is

    influenced by the target-to-target interval (TTI), with increases in TTI systematically

    enhancing LPC amplitudes. This study explored whether other ERP component amplitudes

    are affected by TTI in a similar manner. Electroencephalographic activity was recorded

    from 27 participants in a three-stimulus visual oddball task with equiprobable targets and

    infrequent nontargets, and frequent standards. We manually identified component peak

    amplitudes relative to a 100 ms prestimulus baseline. The selection of these amplitudes

    was confirmed with a temporal principal components analysis. As hypothesised, LPC

    amplitudes were enhanced by longer TTIs. P2 evidenced a similar response profile, where

    increases in TTI linearly augmented P2 amplitudes. However, the same pattern of results

    was not apparent for N1, where amplitudes were not affected by interval. It was also found

    that N2 amplitude decreased as TTI increased. Taken together, these results suggest that

    some exogenous ERP components are responsive to changes in the timing of target stimuli

    in a similar fashion to that of the later endogenous component, the LPC. Hence, it could

    be argued that TTI variation influences the attention and working memory systems

    involved in processing target stimuli. Implications are discussed in relation to context-

    update and context-closure theories.

Publication Date


  • 2012

Citation


  • Steiner, G., Gonsalvez, C. J., Barry, R. J., De Blasio, F. & Brennan, M. (2012). Target-to-target interval influences a range of erp components. Psychophysiology: an international journal, 49 (Supplement s1), S53-S53.

Ro Metadata Url


  • http://ro.uow.edu.au/sspapers/58

Start Page


  • S53

End Page


  • S53

Volume


  • 49

Issue


  • Supplement s1