Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions
Purpose: Flicker-defined form (FDF) stimuli have recently been adopted for visual field testing. A key difference between FDF and traditional perimetric stimuli is that the entire display background contains flickering dots. The purpose of this study was to determine whether the perception of FDF st...
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| Format: | Article |
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Wiley
2016
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| Online Access: | https://eprints.nottingham.ac.uk/31254/ |
| _version_ | 1848794160779231232 |
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| author | Denniss, Jonathan McKendrick, Allison M. |
| author_facet | Denniss, Jonathan McKendrick, Allison M. |
| author_sort | Denniss, Jonathan |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Purpose: Flicker-defined form (FDF) stimuli have recently been adopted for visual field testing. A key difference between FDF and traditional perimetric stimuli is that the entire display background contains flickering dots. The purpose of this study was to determine whether the perception of FDF stimuli is influenced by lateral interactions involving regions beyond the stimulus border in young healthy observers.
Methods: Experiment 1 measured the effect of surround size and retinal eccentricity on the detection of the FDF contour. Psychometric functions were collected for surround diameters of 20, 30 and 40°, and with stimuli centered at eccentricities of 0, 10 and 20°. Experiment 2 measured the effect of target-surround temporal phase difference on apparent temporal contrast (flicker strength) of the target for both the FDF stimulus and a solid-field stimulus. Psychometric functions were collected for target-surround phase differences of 0, 45, 90, 135 and 180°.
Results: Our results show a mild surround-suppression effect for FDF stimuli that is independent of surround size. Magnitudes of FDF surround suppression were consistent with the reduced temporal contrast energy of the stimulus compared to solid-field stimuli.
Conclusion: FDF stimuli necessarily have both flickering target and background. Our results suggest that visual field defects outside the target are unlikely to markedly influence the detection and perception of the FDF stimulus. Nevertheless, mild surround suppression of contrast arises for FDF stimuli, hence interactions between the background and the target area may influence FDF results in conditions that alter centre-surround perceptual effects. |
| first_indexed | 2025-11-14T19:11:47Z |
| format | Article |
| id | nottingham-31254 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:11:47Z |
| publishDate | 2016 |
| publisher | Wiley |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-312542020-05-04T17:33:18Z https://eprints.nottingham.ac.uk/31254/ Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions Denniss, Jonathan McKendrick, Allison M. Purpose: Flicker-defined form (FDF) stimuli have recently been adopted for visual field testing. A key difference between FDF and traditional perimetric stimuli is that the entire display background contains flickering dots. The purpose of this study was to determine whether the perception of FDF stimuli is influenced by lateral interactions involving regions beyond the stimulus border in young healthy observers. Methods: Experiment 1 measured the effect of surround size and retinal eccentricity on the detection of the FDF contour. Psychometric functions were collected for surround diameters of 20, 30 and 40°, and with stimuli centered at eccentricities of 0, 10 and 20°. Experiment 2 measured the effect of target-surround temporal phase difference on apparent temporal contrast (flicker strength) of the target for both the FDF stimulus and a solid-field stimulus. Psychometric functions were collected for target-surround phase differences of 0, 45, 90, 135 and 180°. Results: Our results show a mild surround-suppression effect for FDF stimuli that is independent of surround size. Magnitudes of FDF surround suppression were consistent with the reduced temporal contrast energy of the stimulus compared to solid-field stimuli. Conclusion: FDF stimuli necessarily have both flickering target and background. Our results suggest that visual field defects outside the target are unlikely to markedly influence the detection and perception of the FDF stimulus. Nevertheless, mild surround suppression of contrast arises for FDF stimuli, hence interactions between the background and the target area may influence FDF results in conditions that alter centre-surround perceptual effects. Wiley 2016-01-06 Article PeerReviewed Denniss, Jonathan and McKendrick, Allison M. (2016) Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions. Ophthalmic and Physiological Optics . ISSN 1475-1313 Centre-surround; Flicker; Flicker-defined form; Lateral interactions; Perimetry; Phantom contour http://onlinelibrary.wiley.com/doi/10.1111/opo.12268/abstract doi:10.1111/opo.12268 doi:10.1111/opo.12268 |
| spellingShingle | Centre-surround; Flicker; Flicker-defined form; Lateral interactions; Perimetry; Phantom contour Denniss, Jonathan McKendrick, Allison M. Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| title | Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| title_full | Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| title_fullStr | Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| title_full_unstemmed | Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| title_short | Flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| title_sort | flicker-defined form stimuli are minimally affected by centre-surround lateral contrast interactions |
| topic | Centre-surround; Flicker; Flicker-defined form; Lateral interactions; Perimetry; Phantom contour |
| url | https://eprints.nottingham.ac.uk/31254/ https://eprints.nottingham.ac.uk/31254/ https://eprints.nottingham.ac.uk/31254/ |