Recent methodological developments have begun to address this shortcoming by isolating ocular and brain-based activity during tasks that are typically performed with eye movements (e.g. A shortcoming of this approach, however, is that it restricts our understanding of the neural correlates of visual perception during overt visual search, that is, visual search tasks performed with eye movements. An advantage of covert visual search in EEG studies is that it limits the non-neural sources of noise produced by eye movements which have a much greater magnitude with respect to the neural signals of interest. A significant portion of this work has focused on evaluating EEG responses during covert visual search whereby participants must search for a target without making eye movements. There is a large body of work, conducted over many decades, dedicated to exploring and understanding the mechanisms of visual search. Visual search is an essential component of everyday human behavior and requisite for a number of real-world tasks. The authors disclose no conflicts of interest. ![]() This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials. BA performed all contributions to the manuscript while working for Teledyne Scientific but is currently employed by the College of Engineering and Computing, Nova Southeastern University, Fort Lauderdale, Florida. W911NF-09-D-0001 to all authors, two of whom (BA and PC) work for Teledyne Scientific Company. The specific roles of these authors are articulated in the ‘author contributions’ section.Ĭompeting interests: This research was supported by U.S. The funder provided support in the form of salaries for authors, but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. Nevertheless, we will perform all the necessary steps to meet the Army Regulations mentioned above and all interested researchers wishing to obtain the data may do so upon request by contacting Theresa Straut, Human Protection Administrator, or Anthony Ries, U.S. The uploaded summary data have been approved for public sharing by our operational security however the raw datasets from all subjects have not and must undergo an operational security check per Army Regulations 380-5 and AR-530-1 in order for them to be uploaded to a public repository. This information was uploaded as S1– S11 Files under Supporting Information. The work is made available under the Creative Commons CC0 public domain dedication.ĭata Availability: We have uploaded the data underlying our findings which can be used to recreate the figures and tables in the manuscript. This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. Received: DecemAccepted: Published: June 10, 2016 PLoS ONE 11(6):Įditor: Benjamin Thompson, University of Waterloo, CANADA The results show that both early and late stages of visual processing indexed by FRPs are significantly affected by concurrent task demands imposed by auditory working memory.Ĭitation: Ries AJ, Touryan J, Ahrens B, Connolly P (2016) The Impact of Task Demands on Fixation-Related Brain Potentials during Guided Search. Moreover, high auditory task demands increased the P3 but not the lambda latency while the amplitude of both lambda and P3 was reduced during high auditory task demands. The results showed increased reaction time and decreased accuracy in both the visual search and N-back tasks as a function of auditory load. ![]() Participants performed the guided search task alone, while ignoring binaurally presented digits, or while using the auditory information in a 0, 1, or 2-back task. ![]() ![]() We addressed this question by obtaining simultaneous eye-movement and electroencephalographic (EEG) measures during a guided visual search task while parametrically modulating working memory load using an auditory N-back task. An outstanding question is whether the lambda and P3 FRP components are influenced by concurrent task demands. Using this approach we obtained fixation related potentials (FRPs) during a guided visual search task specifically focusing on the lambda and P3 components. Recording synchronous data from EEG and eye-tracking provides a unique methodological approach for measuring the sensory and cognitive processes of overt visual search.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |