Abstract
We propose two explicit mechanisms contributing to oculomotor inhibition of return (IOR): sensory and motor. Sensory mechanism: repeated visual stimulation results in a reduction in visual input to the superior colliculus (SC); consequently, saccades to targets that appear at previously stimulated retinotopic locations will have longer latencies than those that appear at unstimulated locations. Motor mechanism: the execution of a saccade results in asymmetric activation in the SC; as a result, saccades that reverse vectors will have longer latencies than those that repeat vectors. In the IOR literature, these two mechanisms correspond to IOR effects observed following covert exogenous orienting and overt endogenous orienting, respectively. We predict that these two independent mechanisms will have additive effects, a prediction that is confirmed in a behavioral experiment. We then discuss how our theory and findings relate to the oculomotor IOR literature.
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Notes
One could always use two differential equations to approximate this input reduction, but we chose to use the alpha function for simplicity.
One might suggest that this mechanism should not be regarded as a contributor to IOR because the forward facilitation it generates (saccade momentum) causes a disadvantage for return saccades. Although such a suggestion has merit, so too does our maintenance of the IOR terminology. Our previous modeling papers (Satel et al. 2011; Wang et al. 2011) have addressed two extreme situations where the behavioral effects had been, by convention in the field, labeled as IOR: (1) covert orienting where IOR is elicited by uninformative peripheral cues while the participant maintains fixation until target presentation; (2) overt orienting where IOR is used to label longer latencies for saccades returning to previously fixated locations (e.g., Klein and MacInnes 1999). We prefer to continue to use “IOR” to label both cases because we are following the “convention” in the field where IOR is used to loosely refer to a set of processes that facilitate orienting to novelty. The importance of our contribution rests not on terminology but on the computationally explicit nature of the sensory and motor mechanisms we have proposed to implement these processes.
Readers may be surprised that the saccade back to the central fixation was no slower than the one to the peripheral box (in response to the cue) in the M task. It should be noted that unlike saccades to the targets of which the direction was unpredictable, saccades made in response to the cue-back signal were always directed to the central box.
Although the conceptual underpinning seems quite different (rooted as it is in the notion of cue-target integration) Lupianez’s proposal of a cue-induced “onset detection cost” (Lupiáñez 2010; see also Hu et al. 2011) shares quite a few properties with this suppression effect that is fundamental to our sensory mechanism.
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Acknowledgments
We are grateful to Juan Lupiáñez, Matthew Hilchey and two anonymous reviewers for their constructive comments and suggestions on an earlier version of this paper. Z. Wang was supported by China Scholarship Council (CSC); R. M. Klein was supported by Natural Sciences and Engineering Research Council of Canada (NSERC).
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Wang, Z., Satel, J. & Klein, R.M. Sensory and motor mechanisms of oculomotor inhibition of return. Exp Brain Res 218, 441–453 (2012). https://doi.org/10.1007/s00221-012-3033-8
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DOI: https://doi.org/10.1007/s00221-012-3033-8