A5031288807- Visual perception and processing mechanisms
- Multisensory perception and integration
- Neural dynamics and brain function
- Color perception and design
- Face Recognition and Perception
- Categorization, perception, and language
- Infrared Target Detection Methodologies
- Aesthetic Perception and Analysis
- Speech and Audio Processing
- Visual Attention and Saliency Detection
- Functional Brain Connectivity Studies
- CCD and CMOS Imaging Sensors
- Hearing Loss and Rehabilitation
Cognitive Neuroimaging Lab
2024
University of Glasgow
2020-2024
Queen Elizabeth University Hospital
2023-2024
Université Claude Bernard Lyon 1
2017-2021
Wellcome Centre for Human Neuroimaging
2021
Institut Cellule Souche et Cerveau
2017-2021
Inserm
2017-2021
Abstract Visual illusions and mental imagery are non-physical sensory experiences that involve cortical feedback processing in the primary visual cortex. Using laminar functional magnetic resonance imaging (fMRI) two studies, we investigate if information about these internal is visible activation patterns of different layers cortex (V1). We find content decodable mainly from deep V1, whereas seemingly ‘real’ illusory superficial layers. Furthermore, shares with perceptual content, whilst...
Neurons in the primary visual cortex (V1) receive sensory inputs that describe small, local regions of scene and cortical feedback from higher areas processing global context. Investigating spatial precision this contextual modulation will contribute to our understanding functional role perceptual computations. We used human magnetic resonance imaging (fMRI) test V1 during natural processing. measured brain activity patterns stimulated we blocked direct feedforward input, receiving...
Abstract Identifying the objects embedded in natural scenes relies on recurrent processing between lower and higher visual areas. How is cortical feedback information related to organised areas? The spatial organisation of converging early cortex during object scene could be retinotopically specific as it coded V1, or centred areas, both. Here, we characterise scene-related V1. Participants identified foreground background images with occluded central peripheral subsections, allowing us...
Peripheral vision has different functional priorities for mammals than foveal vision. One of its roles is to monitor the environment while central focused on current task. Becoming distracted too easily would be counterproductive in this perspective, so brain should react behaviourally relevant changes. Gist processing good purpose, and it therefore not surprising that evidence from both imaging behavioural research suggests a tendency generalize blend information periphery. This may caused...
Cross-modal effects provide a model framework for investigating hierarchical inter-areal processing, particularly, under conditions where unimodal cortical areas receive contextual feedback from other modalities. Here, using complementary behavioral and brain imaging techniques, we investigated the functional networks participating in face voice processing during gender perception, high-level feature of perception. Within signal detection decision model, Maximum likelihood conjoint...
Abstract Multimodal integration provides an ideal framework for investigating top-down influences in perceptual integration. Here, we investigate mechanisms and functional networks participating face-voice multimodal during gender perception by using complementary behavioral (Maximum Likelihood Conjoint Measurement) brain imaging (Dynamic Causal Modeling of fMRI data) techniques. Thirty-six subjects were instructed to judge pairs stimuli either according the face (face task), voice (voice...
BACKGROUND African American faces are judged to be darker than Caucasian faces, even when matched for mean luminance and contrast (Levin & Banaji, 2006). This is the Lightness Distortion Effect (LDE), which found blurred, suggesting that low-level visual features drive LDE at least some degree (Firestone Scholl, 2015). Here, measured using maximum likelihood conjoint measurement (MLCM). Upright inverted were tested separately control features. METHODS The joint influence of (1) overall (2)...
Abstract Surface color appearance depends on both local surface chromaticity and global context. How are these inter-dependencies supported by cortical networks? Combining functional imaging psychophysics, we examined if from long-range filling-in engages distinct pathways responses caused a field of uniform chromaticity. We find that is best classified correlated with two dorsal areas, V3A V3B/KO. In contrast, ventral areas hV4 LO. Dynamic causal modeling revealed feedback modulation area...