Poster Session A, Saturday, March 23, 1:30 pm - 3:30 pm, Pacific Concourse
Individual differences in alpha lateralization and behavioral performance during probabilistic and fully instructional spatial-cueing attention task
Jiaqi Wang1, Jianan Wang1, Junfeng Sun1, Shanbao Tong1, Xiangfei Hong2,3; 1School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China, 2Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China, 3J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
The lateralization of alpha (8–13 Hz) band oscillations has become a canonical marker of visual spatial attention. However, very few studies have observed the relationship between cue-induced alpha lateralization and behavioral effects, which makes the functional significance of alpha oscillations elusive. The underlying reason might be related to individual differences in alpha lateralization as reported, and different cueing strategies further complicate this issue. In the present study, we recorded scalp electroencephalography in two spatial-cueing experiments to investigate the individual differences in alpha lateralization and its relationship with behavioral performance. A classical Posner paradigm with probabilistic cues (~74% valid) was applied in Experiment 1 (N=24), whereas a fully instructional spatial-cueing paradigm was applied in Experiment 2 (N=30). In both experiments, we found significant correlation between pre-cue baseline alpha-power and post-cue alpha lateralization. Furthermore, we equally divided the subjects into 2 sub-groups according to their baseline alpha-power, and found that only the sub-group with higher baseline alpha-power showed significant alpha lateralization. We then assessed the relationship between alpha lateralization and behavior at both between-subject and within-subject levels. The correlation analysis at the between-subject level revealed no significant findings in two experiments. At the within-subject level, however, alpha lateralization and behavior (detection rate) showed a significant positive relationship in Experiment 1, but only in the higher baseline sub-group. Taken together, our results clearly showed substantial individual differences in alpha lateralization, and such differences should be taken into account when investigating the relationship between alpha lateralization and behavioral effects in visual spatial attention.
Topic Area: ATTENTION: Spatial