Efficient 'Pop-Out' Visual Search Elicits Sustained Broadband Gamma Activity in the Dorsal Attention Network
| Autor: | Jean-Philippe Lachaux, Olivier F. Bertrand, Juan R. Vidal, Tomás Ossandón, Sarang S. Dalal, Philippe Kahane, Karim Jerbi, Lorella Minotti, Carolina Ciumas, Carlos M. Hamamé |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Adult
Male Time Factors media_common.quotation_subject 050105 experimental psychology Young Adult 03 medical and health sciences 0302 clinical medicine Task-positive network Reaction Time medicine Humans Contrast (vision) Attention 0501 psychology and cognitive sciences Prefrontal cortex Anterior cingulate cortex media_common Cerebral Cortex Visual search General Neuroscience Superior parietal cortex 05 social sciences Articles Middle Aged Brain Waves medicine.anatomical_structure Pattern Recognition Visual Female Nerve Net Psychology Neuroscience N2pc Gamma band Photic Stimulation 030217 neurology & neurosurgery |
| Zdroj: | Journal of Neuroscience; Vol 32 JOURNAL OF NEUROSCIENCE Artículos CONICYT CONICYT Chile instacron:CONICYT |
| ISSN: | 1529-2401 0270-6474 |
| DOI: | 10.1523/jneurosci.6048-11.2012 |
| Popis: | An object that differs markedly from its surrounding—for example, a red cherry among green leaves—seems to pop out effortlessly in our visual experience. The rapid detection of salient targets, independently of the number of other items in the scene, is thought to be mediated by efficient search brain mechanisms. It is not clear, however, whether efficient search is actually an “effortless” bottom-up process or whether it also involves regions of the prefrontal cortex generally associated with top-down sustained attention. We addressed this question with intracranial EEG (iEEG) recordings designed to identify brain regions underlying a classic visual search task and correlate neural activity with target detection latencies on a trial-by-trial basis with high temporal precision recordings of these regions in epileptic patients. The spatio-temporal dynamics of single-trial spectral analysis of iEEG recordings revealed sustained energy increases in a broad gamma band (50–150 Hz) throughout the duration of the search process in the entire dorsal attention network both in efficient and inefficient search conditions. By contrast to extensive theoretical and experimental indications that efficient search relies exclusively on transient bottom-up processes in visual areas, we found that efficient search is mediated by sustained gamma activity in the dorsal lateral prefrontal cortex and the anterior cingulate cortex, alongside the superior parietal cortex and the frontal eye field. Our findings support the hypothesis that active visual search systematically involves the frontal-parietal attention network and therefore, executive attention resources, regardless of target saliency. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|