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The fusion of unattended duration representations as indexed by the mismatch negativity (MMN).
Brain Res. 2012 Jan 30; 1435:118-29.BR

Abstract

Within a single train of same-duration (standard) stimuli, an occasional longer-duration (deviant) sound elicits mismatch negativity (MMN) with a peak latency (measured relative to sound onset) reflecting the standard duration representation. When two such trains are presented in a dichotic paradigm, a separate duration representation arises for each train. We examined the role of attention in this segregation. Four sound trains of differing frequencies (1000 and 1200 Hz to one ear, 2000 and 2400 Hz to the other ear) were presented simultaneously. Participants attended the lower frequency (Low) sounds (always 100 ms) in one ear. Duration of the other (High) sounds varied: 100 ms in the Equal condition; 40 ms in the Short condition. If attention was necessary for separation of sound representations, the two attended ear representations were hypothesised to segregate whilst the two unattended ear's representations would remain fused. Duration MMN was recorded to occasional (1 in 18) 150 ms deviants in all trains. In the Short condition, if unattended ear representations fused, earlier peaking unattended Low sound MMN was expected, relative to when this ear was attended. In the same condition, the MMN for unattended High sounds was expected to peak later, relative to when attended. Low sound unattended MMN latency was indeed earlier by ~30 ms relative to when attended. High sound unattended MMN latency, however, only increased ~9 ms in the same transition. This smaller magnitude change is explained by a minimum MMN onset latency. Attention alone appears to offer a basis for segregating MMN representations.

Authors+Show Affiliations

Functional Neuroimaging Laboratory, School of Psychology, University of Newcastle, Callaghan, 2308, New South Wales, Australia.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22197031

Citation

Pfingst, Kane A., and David N. McKenzie. "The Fusion of Unattended Duration Representations as Indexed By the Mismatch Negativity (MMN)." Brain Research, vol. 1435, 2012, pp. 118-29.
Pfingst KA, McKenzie DN. The fusion of unattended duration representations as indexed by the mismatch negativity (MMN). Brain Res. 2012;1435:118-29.
Pfingst, K. A., & McKenzie, D. N. (2012). The fusion of unattended duration representations as indexed by the mismatch negativity (MMN). Brain Research, 1435, 118-29. https://doi.org/10.1016/j.brainres.2011.10.043
Pfingst KA, McKenzie DN. The Fusion of Unattended Duration Representations as Indexed By the Mismatch Negativity (MMN). Brain Res. 2012 Jan 30;1435:118-29. PubMed PMID: 22197031.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The fusion of unattended duration representations as indexed by the mismatch negativity (MMN). AU - Pfingst,Kane A, AU - McKenzie,David N, Y1 - 2011/10/31/ PY - 2011/06/26/received PY - 2011/10/24/revised PY - 2011/10/26/accepted PY - 2011/12/27/entrez PY - 2011/12/27/pubmed PY - 2012/11/8/medline SP - 118 EP - 29 JF - Brain research JO - Brain Res VL - 1435 N2 - Within a single train of same-duration (standard) stimuli, an occasional longer-duration (deviant) sound elicits mismatch negativity (MMN) with a peak latency (measured relative to sound onset) reflecting the standard duration representation. When two such trains are presented in a dichotic paradigm, a separate duration representation arises for each train. We examined the role of attention in this segregation. Four sound trains of differing frequencies (1000 and 1200 Hz to one ear, 2000 and 2400 Hz to the other ear) were presented simultaneously. Participants attended the lower frequency (Low) sounds (always 100 ms) in one ear. Duration of the other (High) sounds varied: 100 ms in the Equal condition; 40 ms in the Short condition. If attention was necessary for separation of sound representations, the two attended ear representations were hypothesised to segregate whilst the two unattended ear's representations would remain fused. Duration MMN was recorded to occasional (1 in 18) 150 ms deviants in all trains. In the Short condition, if unattended ear representations fused, earlier peaking unattended Low sound MMN was expected, relative to when this ear was attended. In the same condition, the MMN for unattended High sounds was expected to peak later, relative to when attended. Low sound unattended MMN latency was indeed earlier by ~30 ms relative to when attended. High sound unattended MMN latency, however, only increased ~9 ms in the same transition. This smaller magnitude change is explained by a minimum MMN onset latency. Attention alone appears to offer a basis for segregating MMN representations. SN - 1872-6240 UR - https://www.unboundmedicine.com/medline/citation/22197031/The_fusion_of_unattended_duration_representations_as_indexed_by_the_mismatch_negativity__MMN__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0006-8993(11)01996-2 DB - PRIME DP - Unbound Medicine ER -