Reinforcement reduces the size–latency phenomenon: A cost–benefit evaluation of saccade triggering

Article


Vullings, Cécile, Harwood, M. and Madelain, Laurent 2019. Reinforcement reduces the size–latency phenomenon: A cost–benefit evaluation of saccade triggering. Journal of Vision. 19 (4), p. Art. 16.
AuthorsVullings, Cécile, Harwood, M. and Madelain, Laurent
Abstract

Saccadic latencies are known to change as a function of target eccentricity and size. Recently, it has been shown that latencies consistently change according to the amplitude of the step in proportion to the size of the target (Madelain, Krauzlis, & Wallman, 2005; Harwood, Madelain, Krauzlis, & Wallman, 2008; De Vries, Azadi, & Harwood, 2016). This effect, called the size–latency phenomenon, might be seen as a function of a cost–benefit relationship: Longer latencies might be explained by the lower benefit of making a saccade while the target mostly remains within the attentional field. Here, we probe this hypothesis by manipulating the cost–benefit relationship using a reinforcement procedure. Participants tracked a target stepping horizontally with varying amplitudes and sizes such that the step-to-size ratio was equal to either 0.3 or 1.5. We used a dynamic-reinforcement criterion in the blocked conditions. In the 0.3-ratio condition, any latency shorter than the criterion was reinforced. In the 1.5-ratio condition, any latency longer than the criterion was reinforced. During baseline, we observed the size–latency effect with large differences in latencies depending on the ratio in force (229 and 161 ms, respectively, for 0.3 and 1.5). After learning, distributions shifted toward the shorter or longer value (198 and 236 ms, respectively, for 0.3 and 1.5). On average, latencies decreased by 31 ms and increased by 75 ms according to the ongoing reinforcement contingencies. Our results indicate that reinforcement contingencies can considerably affect saccadic-latency distributions, and support the idea of a cost–benefit evaluation of saccade triggering.

JournalJournal of Vision
Journal citation19 (4), p. Art. 16
ISSN1534-7362
Year2019
PublisherAssociation for Research in Vision and Ophthalmology
Publisher's version
License
Digital Object Identifier (DOI)doi:10.1167/19.4.16
Web address (URL)https://doi.org/10.1167/19.4.16
Publication dates
Print10 Apr 2019
Publication process dates
Deposited26 Apr 2019
Accepted08 Jan 2019
Accepted08 Jan 2019
FunderAgence Nationale de Recherches
National Science Foundation
Agence Nationale de Recherches
National Science Foundation
Copyright information© 2019 The authors
LicenseCC BY-NC-ND 4.0
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https://repository.uel.ac.uk/item/843zz

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