It is well established that visual behavior is influenced by both bottom-up visual factors and top-down cognitive factors. Consequently, a number of investigations have sought to determine how visual behavior is influenced by different task sets, which refers to the goal of an observer when they process a scene. For example, task set has been shown to strongly influence which objects are fixated, how memory influences refixations and probe detection, the timing and location of fixations, and the timing and duration of global relative to local modes of attention to name just a few. Though task set clearly influences visual behavior, the majority of task set studies require participants to perform a single task on a singl image or continuously perform a single task on a variety of images. These investigations ignore the fact that, in the real world, the task set of an individual can change frequently and rapidly a a function of observer intent, during which the visual input could change slightly, change drastically, or remain constant. To understand the influence of task set on visual behavior, therefore, it is important to investigate the influence of task switching. The study of task switching has a rich history in psychology, with numerous demonstrations that the requirement to switch tasks leads to a variety of behavioral costs and benefits. Surprisingly, however, there have been few investigations of how task switching impacts visual behavior, with existing studies being primarily concerned with the executive control required to perform prosaccades and antisaccades. To fully understand the manner in which visual behavior is impacted by previous experiences, it is critical to determine whether subsequent processing of a visual input is fundamentally altered when a) the input remains the same but the observer's goal changes and b) when the visual input changes but the task goals remain consistent. The present proposal will address this gap in knowledge by conducting sixteen experiments examining the influence of task-switching on visual behavior. The experiments are designed to assess the primary costs and benefits associated with task-switching (E1) and how these are moderated by scene repetition (E2, E6-8), alternation predictability (E3, E5, E6, E8), repetition probability (E, E5, E7, E8), and whether the instructions emphasize bottom-up (E1-8) or top-down (E9-16) factors. The proposed research has both theoretical and practical implications as it relates to the manner in which visual behavior is influenced by task-switching. Given that the present study concerns the basic functioning of the normal, adult visual system, it contributes to the scientific understanding of visual-cognitive mechanisms in the brain. In addition, the proposed research concerns costs and benefits relating to visual mechanisms that support efficient gaze control and oculomotor behavior which has significant implications for performance across a variety of fields in which visual task- switching is an important component of everyday performance.

Public Health Relevance

Successful interaction with complex visual environments requires the ability to transition efficiently from one type of visual behavior (e.g., searching fo an object) to another (e.g., evaluating affective dimensions of a scene) depending on situational demands and the goals of the observer. As such, numerous studies have examined the influence of different task sets on visual behavior. While there is ample evidence that top-down task set can influence oculomotor behavior, previous examinations of task set have required participants to perform a single task on a single image, or a single task continuously on a variety of images. These investigations ignore the fact that, in the real world, the task set of an individual can change frequently and rapidly as a function of observer intent, during which time the visual input could change slightly, change drastically, or remain constant. The purpose of the present research is to investigate the influence of task switching on visual behavior in a comprehensive manner. Given that the present study concerns the basic functioning of the normal, adult visual system, it contributes to the scientific understanding of visual-cognitive mechanisms in the brain. In addition, the proposed research concerns costs and benefits relating to visual mechanisms that support efficient gaze control and oculomotor behavior which has significant implications for performance across a variety of fields in which visual task-switching is an important component of everyday performance.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY022974-03
Application #
8841372
Study Section
Cognition and Perception Study Section (CP)
Program Officer
Wiggs, Cheri
Project Start
2013-05-01
Project End
2016-04-30
Budget Start
2015-05-01
Budget End
2016-04-30
Support Year
3
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of Nebraska Lincoln
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
555456995
City
Lincoln
State
NE
Country
United States
Zip Code
68583
Bahle, Brett; Mills, Mark; Dodd, Michael D (2017) Human classifier: Observers can deduce task solely from eye movements. Atten Percept Psychophys 79:1415-1425
Mills, Mark; Alwatban, Mohammed; Hage, Benjamin et al. (2017) Cerebral hemodynamics during scene viewing: Hemispheric lateralization predicts temporal gaze behavior associated with distinct modes of visual processing. J Exp Psychol Hum Percept Perform 43:1291-1302
Hage, Benjamin; Alwatban, Mohammed R; Barney, Erin et al. (2016) Functional Transcranial Doppler Ultrasound for Measurement of Hemispheric Lateralization During Visual Memory and Visual Search Cognitive Tasks. IEEE Trans Ultrason Ferroelectr Freq Control 63:2001-2007
Bahle, Brett; Mills, Mark; Dalmaijer, Edwin et al. (2015) The Effects of Task- and Switch-Predictability on Oculomotor Inhibition of Return During Visual Search. J Vis 15:777
Mills, Mark; Dalmaijer, Edwin S; Van der Stigchel, Stefan et al. (2015) Effects of task and task-switching on temporal inhibition of return, facilitation of return, and saccadic momentum during scene viewing. J Exp Psychol Hum Percept Perform 41:1300-1314
Mills, Mark; Bahle, Brett; Dalmaijer, Edwin et al. (2015) Effects of task- and switch-predictability on task-switching during scene viewing. J Vis 15:778