Maniglia, Marcello, Pavan, Andrea and Trotter, Yves (2015) The effect of spatial frequency on peripheral collinear facilitation. Vision Research, 107 . pp. 146-154. ISSN 0042-6989
Full content URL: https://doi.org/10.1016/j.visres.2014.12.008
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Maniglia Pavan Trotter 2015 VR.pdf - Whole Document Restricted to Repository staff only 1MB |
Item Type: | Article |
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Item Status: | Live Archive |
Abstract
The detection of a Gabor patch (target) can be decreased or improved by the presence of co-oriented Gabor patches (flankers) having the same spatial frequency as the target. These phenomena are thought to be mediated by lateral interactions. Depending on the distance between target and flankers, commonly defined as a multiple of the wavelength (λ) of the carrier, flankers can increase or decrease a target's detectability. Studies with foveal presentation showed that for target-to-flankers distances <2λ contrast thresholds for the central target increase, while for target-to-flankers distances >3λ contrast thresholds decrease. Earlier studies on collinear facilitation at the near-periphery of the visual field (4° of eccentricity) showed inconsistent facilitation (Shani & Sagi, 2005, Vision Research, 45, 2009-2024) whereas more recent studies showed consistent facilitation for larger separations (7-8λ) (Maniglia et al., 2011, PLoS ONE, 6, e25568; Lev & Polat, 2011, Vision Research, 51, 2488-2498). However, all of these studies used medium-to-high spatial frequencies (3-8cpd). In this study we tested lower spatial frequencies (1, 2, and 3cpd) with different target-to-flankers distances. The rationale was that near-peripheral vision is tuned for lower spatial frequencies and this could be reflected in collinear facilitation. Results show consistent collinear facilitation at 8λ for all the spatial frequencies tested, but also show collinear facilitation at shorter target-to-flanker distance (6λ) for the lowest spatial frequencies tested (1cpd). Additionally, collinear facilitation decreases as spatial frequency increases; opposite to the findings of Polat (2009, Spatial Vision, 22, 179-193) in the fovea, indicating a different spatial frequency tuning between foveal and peripheral lateral interactions.
Keywords: | Lateral interactions, Spatial frequency tuning, Collinear facilitation, Near-periphery of the visual field, bmjproof, bmjgoldcheck, NotOAChecked |
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Subjects: | C Biological Sciences > C830 Experimental Psychology |
Divisions: | College of Social Science > School of Psychology |
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ID Code: | 16382 |
Deposited On: | 07 Jan 2015 12:15 |
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