Eccentricity dependence of orientation anisotropy of surround suppression of contrast-detection threshold

Malavita, Menaka S; Vidyasagar, T. R.; McKendrick, Allison M

doi:10.1167/18.7.5

Cited by 4 publications

(15 citation statements)

References 67 publications

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“…Finally, as can be seen in the Figure 4, surround suppression for the orthogonal condition (orange bars) at 6°eccentricity ( Figures 4A and B) is almost completely released (suppression ratio close to 1 as indicated by dashed lines) whereas at 15°eccentricity ( Figures 4C and D) suppression can be still seen for orthogonal surrounds. This result is consistent with previous evidence of surround suppression showing less dependency on the difference in orientation between the center and surround with more eccentric viewing (Malavita et al, 2018;Petrov & McKee, 2009;Silver et al, 2008).…”

Section: Discussionsupporting

confidence: 93%

The effect of aging on the eccentricity dependency of orientation anisotropy of perceptual surround suppression

2021

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The features of perceptual surround suppression vary with eccentricity, such that the suppression strength is increased for horizontally oriented stimuli relative to other orientations near the fovea, but is strongest for radially oriented stimuli more peripherally. Perceptual suppression also varies with age, which has been well-studied for central fixation. However, only limited data are available regarding perceptual suppression in older adults for nonfoveal vision, and none of those studies have taken orientation biases of contrast sensitivity into account. Here, we explored the effects of older age on the eccentricity dependency of orientation biases of perceptual suppression. We found increased perceptual suppression in older adults at both 6°and 15°e ccentricities relative to younger adults. A main effect of the horizontal orientation bias was found at 6°and a main effect of the radial orientation bias was found at 15°in both groups. In summary, perceptual surround suppression of contrast is stronger for older adults compared with younger adults at 6°and 15°e ccentricities, but retinotopic orientation anisotropies are maintained with age. This study provides new insight into parafoveal visual perception in older adults, which may be particularly important to understand the visual experience of those who depend on nonfoveal vision owing to common age-related eye diseases.

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Section: Discussionsupporting

confidence: 93%

The effect of aging on the eccentricity dependency of orientation anisotropy of perceptual surround suppression

2021

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“…Both groups showed stronger suppression for stimuli that were oriented cardinally at 6 degrees, and radially at 15 degrees, relative to other orientation pairings. Similar to our current experiment, older adults showed stronger suppressive effects that younger adults at these non‐foveal eccentricities, however no differences in orientation biases were found between groups …”

Section: Discussionsupporting

confidence: 84%

“…Similar to our current experiment, older adults showed stronger suppressive effects that younger adults at these non-foveal eccentricities, however no differences in orientation biases were found between groups. 46 Dividing attention resulted in elevated duration thresholds overall but did not change motion suppression indices. Our study was partially motivated by a previous observation that dividing attention paradoxically resulted in an improvement in sensitivity to motion cues encoded in random dot kinematograms.…”

Section: Discussionmentioning

confidence: 97%

“…Future experiments may like to consider varying the orientation of the Gabor to test this possibility directly. It is worth noting that centrifugal biases exist in the strength of surround suppression of contrast depending on the direction from fixation and eccentricity in the visual field . We have recently explored perceptual centre‐surround contrast suppression in older and younger adults to explore for differences in orientation anisotropies at 6 degrees and 15 degrees eccentricity .…”

Section: Discussionmentioning

confidence: 99%

“…45 We have recently explored perceptual centre-surround contrast suppression in older and younger adults to explore for differences in orientation anisotropies at 6 degrees and 15 degrees eccentricity. 46 Both groups showed stronger suppression for stimuli that were oriented cardinally at 6 degrees, and radially at 15 degrees, relative to other orientation pairings. Similar to our current experiment, older adults showed stronger suppressive effects that younger adults at these non-foveal eccentricities, however no differences in orientation biases were found between groups.…”

Section: Discussionmentioning

confidence: 99%

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Ageing elevates peripheral spatial suppression of motion regardless of divided attention

Park

Nguyen

McKendrick

2020

Ophthalmic Physiologic Optic

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Purpose It is more difficult to perceive the direction of motion of larger, high contrast patterns than smaller, low contrast patterns due to spatial suppression. Spatial suppression of motion is considered important to the segmentation of moving objects in the visual environment. Previous studies have shown that such spatial suppression of motion is reduced in older adults in central vision, to the extent that older adults can have better sensitivity than younger adults for foveally presented stimuli. Our study was designed to explore whether spatial suppression of motion is similarly reduced for older adults in parafoveal regions and whether divided attention impacts on suppression strength because attention is known to impact on spatial interactions. Methods Twenty younger (19–34 years) and 18 older (61–77 years) adults completed a single task, where observers identified the direction of a drifting Gabor patch of variable size (σ of the Gaussian envelope = 0.5, 1, 2, 3, 4°) presented at 10 degrees of visual angle while observing a central fixation marker, and a dual task, where observers were required to divide their attention across two stimuli, the peripheral drifting Gabor patch and a central rapid serial visual presentation (RSVP) stream. Results Older adults showed increased spatial suppression of motion relative to younger adults for both tasks (main effect of group: p < 0.001). Dividing attention elevated thresholds for both age groups to a similar extent (main effect of attention: p = 0.002), but did not specifically alter spatial interactions (group x attention interaction: p = 0.13). Conclusions Older adults require significantly longer than younger adults to correctly identify stimulus motion, and demonstrate increased spatial suppression of motion, in peripheral vision. When considered alongside previous evidence for reduced suppression for central fixation, our study provides evidence for substantial differences between foveal and parafoveal mechanisms of spatial suppression.

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Radial bias in face identification

et al. 2023

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Human vision in the periphery is most accurate for stimuli that point towards the fovea. This so-called radial bias has been linked with the organization and spatial selectivity of neurons at the lowest levels of the visual system, from retinal ganglion cells onwards. Despite evidence that the human visual system is radially biased, it is not yet known whether this bias persists at higher levels of processing, or whether high-level representations are invariant to this low-level orientation bias. We used the case of face identity recognition to address this question. The specialized high-level mechanisms that support efficient face recognition are highly dependent on horizontally oriented information, which convey the most useful identity cues in the fovea. We show that face selective mechanisms are more sensitive on the horizontal meridian (to the left and right of fixation) compared to the vertical meridian (above and below fixation), suggesting that the horizontal cues in the face are better extracted on the horizontal meridian, where they align with the radial bias. The results demonstrate that the radial bias is maintained at high-level recognition stages and emphasize the importance of accounting for the radial bias in future investigation of visual recognition processes in peripheral vision.

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Eccentricity dependence of orientation anisotropy of surround suppression of contrast-detection threshold

Cited by 4 publications

References 67 publications

The effect of aging on the eccentricity dependency of orientation anisotropy of perceptual surround suppression

The effect of aging on the eccentricity dependency of orientation anisotropy of perceptual surround suppression

Ageing elevates peripheral spatial suppression of motion regardless of divided attention

Radial bias in face identification

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