article · Figshare · 2023

Spatial frequency and refraction.

John G. Holman (14670911), Winnie W. K. Lai (14670914), Paul Pichler (14670917), Daniel Saska (14670920), Leon Lagnado (90274), Christopher L. Buckley (8755422)

Cited by 0Open access

Abstract

<p>The leftmost bar shows the “nominal” spatial frequency of the grid stimulus that would been perceived in the absence of refraction for all three height conditions. However refractive effects increase the perceived spatial frequency to an extent that depends on the height of the channel above the stimulus (righthand three bars). Following [<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1010924#pcbi.1010924.ref027" target="_blank">27</a>] here we treat the bottom of the channel as an air/water interface. The perceived spatial frequency was estimated by calculating the angle subtended at the eye by rays stemming from the limits of a single stimulus period centered directly below. For the values used in these experiments, the three mid-channel heights of 8mm, 32mm and 56mm above the stimulus and a nominal spatial frequency of 0.0156 cycles per degree (cpd), the perceived spatial frequency would have varied from 0.0187 cpd to 0.021 cpd. Given the spatial frequency tuning curve (<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1010924#pcbi.1010924.s010" target="_blank">S10A Fig</a>), this degree of uncontrolled variation (± 7.7% relative to midpoint of the range) about a point close to the peak of the curve would not be expected to have much effect on OMR performance, as confirmed empirically by the subsequent experiment (<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1010924#pcbi.1010924.s010" target="_blank">S10B Fig</a>). As refractive effects increase towards the periphery this may also suggest that the stimulus region directly below the fish has the strongest influence on the strength of the OMR.</p> <p>(PDF)</p>

Cite this paper

APA 7

(14670911), J. G. H., (14670914), W. W. K. L., (14670917), P. P., (14670920), D. S., (90274), L. L., & (8755422), C. L. B. (2023). Spatial frequency and refraction. Figshare. https://doi.org/10.1371/journal.pcbi.1010924.s011

MLA 9

(14670911), John G. Holman, et al. “Spatial frequency and refraction.” Figshare, 2023, https://doi.org/10.1371/journal.pcbi.1010924.s011.

Chicago

(14670911), John G. Holman, Winnie W. K. Lai (14670914), Paul Pichler (14670917), Daniel Saska (14670920), Leon Lagnado (90274), and Christopher L. Buckley (8755422). 2023. “Spatial frequency and refraction.” Figshare. https://doi.org/10.1371/journal.pcbi.1010924.s011.

Harvard

(14670911), J.G.H. et al. (2023) ‘Spatial frequency and refraction’, Figshare. Available at: https://doi.org/10.1371/journal.pcbi.1010924.s011.

BibTeX

@article{146709112023spatial,
  title = {{Spatial frequency and refraction.}},
  author = {(14670911), John G. Holman and (14670914), Winnie W. K. Lai and (14670917), Paul Pichler and (14670920), Daniel Saska and (90274), Leon Lagnado and (8755422), Christopher L. Buckley},
  journal = {Figshare},
  year = {2023},
  doi = {10.1371/journal.pcbi.1010924.s011}
}

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