August 2016
Volume 16, Issue 12
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2016
Feature-based attentional influences on the accommodation response
Author Affiliations
  • Hamed Bahmani
    Institute for Ophthalmic Research, University of Tuebingen, Roentgenweg 11, 72076 Tuebingen, Germany
  • Wolfgang Fuhl
    Department of Computer Engineering, University of Tuebingen, Sand 13, 72076 Tuebingen, Germany
  • Esteban Gutierrez
    Department of Computer Engineering, University of Tuebingen, Sand 13, 72076 Tuebingen, Germany
  • Enkelejda Kasneci
    Department of Computer Engineering, University of Tuebingen, Sand 13, 72076 Tuebingen, Germany
  • Siegfried Wahl
    Institute for Ophthalmic Research, University of Tuebingen, Roentgenweg 11, 72076 Tuebingen, Germany
Journal of Vision September 2016, Vol.16, 680. doi:10.1167/16.12.680
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      Hamed Bahmani, Wolfgang Fuhl, Esteban Gutierrez, Enkelejda Kasneci, Siegfried Wahl; Feature-based attentional influences on the accommodation response. Journal of Vision 2016;16(12):680. doi: 10.1167/16.12.680.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Accommodation is known as the process by which the vertebrate eye changes optical power to maintain focus on an object as its distance varies. This process is considered as an oculomotor reflex which is controlled by the Edinger-Westphal nucleus. Afferent limb of the neural circuit of accommodation also involves the visual association cortex which is responsible for complex visual processing. It has been shown that visual imagery and concurrent mental activity can modulate accommodative response. In the present study, we investigate possible effects of covert attention on accommodation response. We tested the hypothesis that covertly attending to a moving object could modulate accommodation. We used an autorefractor in a custom made setup to measure the accommodation of the human eyes. The subjects have been instructed to fixate on the center of the infrared camera, while attending to a linearly moving target in their peripheral visual field. They were asked to report the position of the target by pushing a button when it crossed certain markers. We found that the accommodation was significantly altered from the baseline at the moments of focused attention, although there was no displacement of the fixation point. We confirmed that the subjects have not made saccades to the moving target by analyzing the gaze direction. It has been shown extensively that higher cognitive functions of the brain such as visual attention could change the pupil size and dynamics. We provided further evidence that attentional state is reflected in the accommodative response. These findings could shed light on the mechanisms and neural circuits of accommodation and oculomotor system. Moreover, our finding could provide a new behavioral tool to monitor attentional state when pupil dynamics are not reliable. Next steps in this study would be measuring different feature-based attentional effects on multiple accommodative states of the eye.

Meeting abstract presented at VSS 2016

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