August 2014
Volume 14, Issue 10
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2014
Role of vergence during eye fixation in orienting visual attention
Author Affiliations
  • Hans Supèr
    Dept Basic Psychology, Faculty of Psychology (UB)
  • Josep Marco
    Dept Basic Psychology, Faculty of Psychology (UB)
  • Laura Perez Zapata
    Dept Basic Psychology, Faculty of Psychology (UB)
  • Jose Cañete Crespillo
    Mental Health Dept, Consorci Sanitari del Maresme
  • Maria Solé Puig
    Dept Basic Psychology, Faculty of Psychology (UB)
Journal of Vision August 2014, Vol.14, 9. doi:10.1167/14.10.9
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      Hans Supèr, Josep Marco, Laura Perez Zapata, Jose Cañete Crespillo, Maria Solé Puig; Role of vergence during eye fixation in orienting visual attention. Journal of Vision 2014;14(10):9. doi: 10.1167/14.10.9.

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

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Abstract

Neural mechanisms of attention allow selective sensory information processing. Top-down deployment of visual-spatial attention involves extensive cortical feedback connections from frontal cortical regions to lower sensory areas. Here we provide evidence for a novel circuit in guiding top-down attention. In a series of standard attention paradigms (Solé et al., 2013), subjects fixated on a central spot and were required to indicate the change in orientation of one of eight peripheral bars by pressing a button. In trials where the spatial location of the peripheral target was cued, we found strong eye vergence (convergence) while in non-cued trials vergence was weak. Similarly, for high-salient targets, vergence was strong compared to that recorded after presenting low-salient stimuli. Thus when orienting visual attention, the eyes briefly converge. Correspondingly, we recorded visual evoked responses (vERPs). The results show that vERPs reflecting attention deployment (N2pc) were a function of the eye vergence. Moreover, we provide evidence that vergence correlates with the perception of the target. Eyes briefly converge after a perceived target but not after an unnoticed one. Furthermore, we measured vergence in children diagnosed with Attention Deficit Hyperactivity Disorder (ADHD) while performing a cue/no-cue task and compared the results to age-matched controls. A strong vergence was detected in the control group but not in the ADHD group. The near-triad or accommodation reflex does not appear to be an explanatory factor for the observed vergence. We propose that our findings show a novel role for vergence in visual-spatial attention and provide evidence for a feed-forward, oculomotor circuit in top-down visual attention. Solé Puig M, Pérez Zapata L, Aznar-Casanova JA, Supèr H (2013) A Role of Eye Vergence in Covert Attention. PLoS ONE 8(1): e52955. doi:10.1371/journal.pone.0052955

Meeting abstract presented at VSS 2014

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