The Role of Alpha Activity in Spatial and Feature-Based Attention
| Autor: | Joy J. Geng, Rosanne M. van Diepen, Ali Mazaheri, Lee M. Miller |
|---|---|
| Přispěvatelé: | Graduate School, Adult Psychiatry, Other departments |
| Rok vydání: | 2016 |
| Předmět: |
Male
1.2 Psychological and socioeconomic processes Electroencephalography Neuropsychological Tests Functional Laterality 0302 clinical medicine Distraction Feature based Attention Theta Rhythm medicine.diagnostic_test General Neuroscience 05 social sciences Brain General Medicine New Research Alpha Rhythm Mental Health Pattern Recognition Visual Neurological Sensory and Motor Systems Female Psychology Visual Cognitive psychology Adult alpha Sensory system Stimulus (physiology) Pattern Recognition 050105 experimental psychology Lateralization of brain function 03 medical and health sciences Young Adult Clinical Research Underpinning research medicine Reaction Time Humans 0501 psychology and cognitive sciences Analysis of Variance Neurosciences attention poststimulus spatial feature Relevant information Alpha power Neuroscience 030217 neurology & neurosurgery Photic Stimulation |
| Zdroj: | eNeuro, vol 3, iss 5 eNeuro, 3(5), ENEURO.0204-16.2016. Society for Neuroscience eNeuro |
| ISSN: | 2373-2822 |
| Popis: | Modulations in alpha oscillations (∼10 Hz) are typically studied in the context of anticipating upcoming stimuli. Alpha power decreases in sensory regions processing upcoming targets compared to regions processing distracting input, thereby likely facilitating processing of relevant information while suppressing irrelevant. In this electroencephalography study using healthy human volunteers, we examined whether modulations in alpha power also occur after the onset of a bilaterally presented target and distractor. Spatial attention was manipulated through spatial cues and feature-based attention through adjusting the color-similarity of distractors to the target. Consistent with previous studies, we found that informative spatial cues induced a relative decrease of pretarget alpha power at occipital electrodes contralateral to the expected target location. Interestingly, this pattern reemerged relatively late (300–750 ms) after stimulus onset, suggesting that lateralized alpha reflects not only preparatory attention, but also ongoing attentive stimulus processing. Uninformative cues (i.e., conveying no information about the spatial location of the target) resulted in an interaction between spatial attention and feature-based attention in post-target alpha lateralization. When the target was paired with a low-similarity distractor, post-target alpha was lateralized (500–900 ms). Crucially, the lateralization was absent when target selection was ambiguous because the distractor was highly similar to the target. Instead, during this condition, midfrontal theta was increased, indicative of reactive conflict resolution. Behaviorally, the degree of alpha lateralization was negatively correlated with the reaction time distraction cost induced by target–distractor similarity. These results suggest a pivotal role for poststimulus alpha lateralization in protecting sensory processing of target information. |
| Databáze: | OpenAIRE |
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