Τίτλος:
Discrete states of attention during active visual fixation revealed by Markovian analysis of the time series of intrusive saccades
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The frequency of intrusive saccades during maintenance of active visual fixation has been used as a measure of sustained visual attention in studies of healthy subjects as well as of neuropsychiatric patient populations. In this study, the mechanism that generates intrusive saccades during active visual fixation was investigated in a population of young healthy men performing three sustained fixation tasks (fixation to a visual target, fixation to a visual target with visual distracters, and fixation straight ahead in the dark). Markov Chain modeling of inter-saccade intervals (ISIs) was utilized. First- and second-order Markov modeling provided indications for the existence of a non-random pattern in the production of intrusive saccades. Accordingly, the system of intrusive saccade generation may operate in two “attractor” states, one in which intrusive saccades occur at short consecutive ISIs and another in which intrusive saccades occur at long consecutive ISIs. These states might correspond to two distinct states of the attention system, one of low focused – high distractibility and another of high focused – low distractibility, such as those proposed in the adaptive gain theory for the control of attention by the noradrenergic system in the brain. To the authors knowledge, this is the first time that Markov Chain modeling has been applied to the analysis of the ISIs of intrusive saccades. © 2016 IBRO
Συγγραφείς:
Korda, A.I.
Koliaraki, M.
Asvestas, P.A.
Matsopoulos, G.K.
Ventouras, E.M.
Ktonas, P.Y.
Smyrnis, N.
Περιοδικό:
AIMS Neuroscience
Εκδότης:
Elsevier Ireland Ltd
Λέξεις-κλειδιά:
adult; Article; attention; distractibility; eye fixation; eye movement control; human; human experiment; male; Markov chain; noradrenergic system; priority journal; saccadic eye movement; stochastic model; time series analysis; adolescent; biological model; Markov chain; oculography; psychological model; young adult, Adolescent; Attention; Eye Movement Measurements; Fixation, Ocular; Humans; Male; Markov Chains; Models, Biological; Models, Psychological; Saccades; Young Adult
DOI:
10.1016/j.neuroscience.2016.10.012
