The monomodal-oriented attention changes bimodal information processing
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1
Southern Federal University, Russia
The purpose of this study was to investigate the effect of modal-oriented attention to the bimodal stimuli processing by means of comparison of the event related potentials (ERPs). The 21 electrodes were used according to 10-20 system. 15 healthy humans were asked to recognize 5 different complicated stimuli presented randomly, either in the single modality (standard stimulus, P=0.8) or both visual and auditory ones (deviant stimulus, P=0.2). In the first series the standard stimulus was visual and in the second series it was auditory. This created a visual context in the first series ("visual group", VG) and an auditory context in the second ("auditory group", AG). We have compared the bimodal ERPs only in these series thus the single difference between them should be attributed to attention context. The data were split up four groups according to the modality of attention context and the modality of optimal stimulus (which was determined consistently with better recognized monomodal stimulus). The N1, P2, N2, and P3 waves were analyzed. The first two were unstable and revealed not everywhere. The N1 was considerably larger in VG than in AG in all areas except temporal and parietal ones. The maximal amplitudes of N1 in VG were achieved in Fp and F but the latencies here were behind up to 30 ms. P2 was presented everywhere except the occipital area in the AG and present only in the anterior and occipital areas in the VG. Amplitudes of this wave were identical in the both groups but latencies in the AG were much shorter, up to 50 ms.
Two other waves, N2 and P3, were more stable. N2 was presented in all recorded areas in both groups. It had larger amplitudes in both frontal and central areas and significantly shorter latent periods in the AG. The same behavior of latencies observed in P3 excepting the occipital area. In the last one P3 was considerably influenced by the modality of optimal stimulus. The P3 latency was shortened in the VG in the case of visual optimal stimulus versus auditory one. The AG revealed contrary conduct: elongated latency in the case of visual optimal stimulus. The amplitude of P3 had simple law - in the VG it was two-fold larger than in the AG, especially in the parietal and occipital areas. Making generalization one could say that all waves are formed notably faster in the auditory context than in the visual one. The AG has larger amplitudes of N2 and smaller amplitudes of P3 than VG. The anterior and posterior areas (Fp, F and O) have more ordered overall ERPs structure during the visual context and the central (T, P and C) - during the auditory context.
The comparison of four groups mentioned above showed that N2 depends more on the modality of optimal stimulus, P3 - on the attention context (amplitude elongates for visual modality), and P2 - on the coincidence of modalities of optimal and standard stimuli (elongation is provoked by discordance of stimuli).
Conference:
Neuroinformatics 2009, Pilsen, Czechia, 6 Sep - 8 Sep, 2009.
Presentation Type:
Poster Presentation
Topic:
Electrophysiology
Citation:
Tikidji-Hamburyan
A and
Babenko
V
(2019). The monomodal-oriented attention changes bimodal information processing.
Front. Neuroinform.
Conference Abstract:
Neuroinformatics 2009.
doi: 10.3389/conf.neuro.11.2009.08.063
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Received:
22 May 2009;
Published Online:
09 May 2019.
*
Correspondence:
Alexandra Tikidji-Hamburyan, Southern Federal University, Rostov-on-Don, Russia, alex-z-nn@rambler.ru