On the asymmetric interaction between hemispheres during the dual-stream rsvp task: evidence from N2pc, P3, and distractor-evoked veps
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1
University of Lubeck, Germany
In dual-stream Rapid Serial Visual Presentation (dual-RSVP), the second target (T2) is worse identified in the right than in the left hemifield. This asymmetry might reflect different abilities of each hemisphere in isolation, or some kind of interaction between hemispheres. In order to differentiate between those two possibilities, we replaced the usual letter distractors by a small set of standard keyboard signs in one of the two streams. If the two hemispheres act in isolation, then T2 identification should improve in the hemisphere contralateral to easy distractors. If there is an interaction between hemispheres, then T2 identification should additionally improve in the hemisphere ipsilateral to easy distractors. In two experiments, only right T2 benefited from easy distracters, displayed either on the right or on the left side whereas left T2 did not. Therefore, when task conditions are less demanding the left hemisphere is probably released from inhibition exerted by the right hemisphere. Additionally, we studied neural correlates of the left visual field advantage using event-related potentials. N2pc latency was always shorter after left than after right T2, independently of the side of easy distractors. Additionally, easy distractors speeded N2pc latency with right T2 and generally tended to increase N2pc amplitude. Similarly, P3 amplitude reflected T2 identification rates, being larger after left than right T2 in the standard condition and being increased after right T2 independently of the side of easy distractors. Surprisingly, distractor-evoked visual potentials were slowed down by easy distractors, presented both on the left or right side. These results suggest that the left visual field advantage in RSVP is reflected in N2pc latency and P3 amplitude.
Keywords:
Cognition,
dual-RSVP
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Cognition and Attention
Citation:
Smigasiewicz
K,
Weinrich
J and
Verleger
R
(2011). On the asymmetric interaction between hemispheres during the dual-stream rsvp task: evidence from N2pc, P3, and distractor-evoked veps.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00468
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Received:
25 Nov 2011;
Published Online:
28 Nov 2011.
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Correspondence:
Dr. Kamila Smigasiewicz, University of Lubeck, Lubeck, Germany, k.smigasiewicz@gmail.com