A5053377502- Visual perception and processing mechanisms
- Face Recognition and Perception
- Visual Attention and Saliency Detection
- Color perception and design
- Color Science and Applications
- Circadian rhythm and melatonin
- Evolutionary Psychology and Human Behavior
- Glaucoma and retinal disorders
- Skin Protection and Aging
- Optical Imaging and Spectroscopy Techniques
University of York
2024-2025
University College London
2020-2024
Melanopsin is a non-image forming light sensitive retinal photopigment. activation takes longer to peak and has prolonged response relative cone photoreceptors. Recent evidence suggests that melanopsin-driven signals may influence vision (through photoreceptor modulation), but it unclear whether melanopsin can directly stimulate visual cortex (e.g. V1), in addition subcortical pathways. Our lab recently observed unusual fMRI time course responses V1 for S-cone isolating stimuli, where the...
Much progress has been made in understanding how the brain combines signals from two eyes. However, most of this work involved achromatic (black and white) stimuli, it is not clear if same processes apply colour-sensitive pathways. In our first experiment, we measured contrast discrimination ('dipper') functions for four key ocular configurations (monocular, binocular, half-binocular dichoptic), achromatic, isoluminant L-M S-(L+M) sine-wave grating stimuli (L: long-, M: medium-, S:...
Visual abilities tend to vary predictably across the visual field-for simple low-level stimuli, visibility is better along horizontal vs. vertical meridian and in lower upper field. In contrast, face perception have been reported show either distinct or entirely idiosyncratic patterns of variation peripheral vision, suggesting a dissociation between spatial properties low- higher-level vision. To assess this link more clearly, we extended methods used vision develop an acuity test for...
Face recognition is widely considered to be "special", involving dedicated brain regions with unique patterns of selectivity. This contrasts increasing evidence for common 'visuospatial coding', where even high-level category-selective areas share the spatial properties earlier regions. Here we examined whether retinotopic face-selective vary around visual field in a similar fashion those early cortex, and these could explain variations face perception field. We carried out mapping (V1-V3)...
Pupil diameters are regulated by the autonomic nervous system, which combines light signals across eyes independently of visual cortex. Distinct classes retinal photoreceptor involved in this process, with cones and rods driving initial constriction intrinsically photosensitive ganglion cells maintaining diameter over prolonged time periods. We investigated binocular combination targeting different pathways using a novel multiprimary system to modulate input spectra via silent substitution....
Much progress has been made in understanding how the brain combines signals from two eyes. However, most of this work involved achromatic (black and white) stimuli, it is not clear if same processes apply color-sensitive pathways. In our first experiment, we measured contrast discrimination ("dipper") functions for four key ocular configurations (monocular, binocular, half-binocular, dichoptic), achromatic, isoluminant L-M S-(L+M) sine-wave grating stimuli (L: long-, M: medium-, S:...
Abstract Visual abilities tend to vary predictably across the visual field – for simple low-level stimuli, visibility is better along horizontal vs. vertical meridian and in lower upper field. In contrast, face perception have been reported show either distinct or entirely idiosyncratic patterns of variation peripheral vision, suggesting a dissociation between spatial properties low- higher-level vision. To assess this link more clearly, we extended methods used vision develop an acuity test...
Visual ability is not equal across the visual field but instead varies in characteristic ways. For example, tasks that measure low-level vision, such as letter acuity or orientation judgements, reveal superior vision lower compared to upper half of (upper-lower anisotropy). Recent research suggests face perception may show same pattern anisotropies, with variations are specific each individual. This study aimed bridge gap between these low and high-level by measuring for judging facial...