15 papers · ranked by Valyu relevance
Jolien P. Schuurmans, Matthew A. Bennett, Kirsten Petras, Valérie Goffaux
Natural images exhibit luminance variations aligned across a broad spectrum of spatial frequencies (SFs). It has been proposed that, at early stages of processing, the coarse signals carried by the low SF (LSF) of the visual input are sent rapidly from primary visual cortex (V1) to ventral, dorsal and frontal regions…
Laurent Caplette, Robin A. A. Ince, Karim Jerbi, Frédéric Gosselin
Visual object recognition seems to occur almost instantaneously. However, not only does it require hundreds of milliseconds of processing, but our eyes also typically fixate the object for hundreds of milliseconds. Consequently, information reaching our eyes at different moments is processed in the brain together.…
Alex S Baldwin, Madeleine Kenwood, Robert F Hess
Boundaries in the visual world can be defined by changes in luminance and texture in the input image. A “contour integration” process joins together local changes into percepts of lines or edges. A previous study tested the integration of contours defined by second-order contrast-modulation. Their contours were placed…
Matthew A. Bennett, Lucy S. Petro, Clement Abbatecola, Lars Muckli
Identifying the objects embedded in natural scenes relies on recurrent processing between lower and higher visual areas. How is cortical feedback information related to objects and scenes organised in lower visual areas? The spatial organisation of cortical feedback converging in early visual cortex during object and…
Saba Charmi Motlagh, Marc Joanisse, Boyu Wang, Yalda Mohsenzadeh
Our brain excels at recognizing objects, even when they flash by in a rapid sequence. However, the neural processes determining whether a target image in a rapid sequence can be recognized or not remained elusive. We used electroencephalography (EEG) to investigate the temporal dynamics of brain processes that shape…
Maria Cuomo, Giovanni Federico, Alessio Fracasso, Antimo Buonocore
When we observe an object, our visual system identifies its shape and integrates it with specific details to form a coherent representation. This coarse-to-fine approach involves rapid processing of low spatial frequency (LSF) content to generate a basic template, which aids the integration of the more detailed high…
Xin Huang, Wai Leung Wong, Chun-Yu Tse, Werner Sommer + 2 more
An influential theory in the field of visual object recognition proposes that fast magnocellular (M) information facilitates neural processing of spatially more fine-grained but slower parvocellular (P) information. While written words can be considered as a special type of visual objects, it is unknown whether…
Johanna Bergmann, Andrew T. Morgan, Lars Muckli
Visual illusions and visual imagery are conscious sensory events that lack a corresponding physical input. But while everyday mental imagery feels distinct from incoming stimulus input, visual illusions, like hallucinations, are under limited volitional control and appear indistinguishable from physical reality.…
G. Tomou, B. Baltaretu, A. Ghaderi, J. D. Crawford
Visual cortex is thought to show both dorsoventral and hemispheric modularity, but it is not known if the same functional modules emerge spontaneously from an unsupervised network analysis, or how they interact when saccades necessitate increased sharing of spatial information. Here, we address these issues by applying…
Hoi Ming Ken Yip, Leo Y. T. Cheung, Vince S. H. Ngan, Yetta Kwailing Wong + 1 more
Recent studies showed that task demand affects object representations in higher-level visual areas and beyond, but not so much in earlier areas. There are, however, limitations in those studies including the relatively weak manipulation of task due to the use of familiar real-life objects, the low temporal resolution…
Simon Weber, Thomas Christophel, Kai Görgen, Joram Soch + 1 more
It has been suggested that visual images are memorized across brief periods of time by vividly imagining them as if they still were there. Such visual imagery has been proposed as a key mechanism underlying working memory. However, the ability to evoke visual imagery varies substantially across individuals, raising the…
Sophia M. Shatek, Tijl Grootswagers, Amanda K. Robinson, Thomas A. Carlson
Mental imagery is the ability to generate images in the mind in the absence of sensory input. Both perceptual visual processing and internally generated imagery engage large, overlapping networks of brain regions. However, it is unclear whether they are characterized by similar temporal dynamics. Recent…
Catriona L. Scrivener, Edward H. Silson
The mechanisms linking perceptual and memory representations in the brain are not yet fully understood. In early visual cortex, perception and memory are known to share similar neural representations, but how they interact beyond early visual cortex is less clear. Recent work identified that scene-perception and…
John E. Kiat, Steven J. Luck
Visual working memory is essential for navigating through and interacting with complex real-world environments. It is therefore important to understand how natural visual inputs—characterized by complex contours, continuously varying feature gradients, and spatial relationships—are represented in working memory.…
Nadine Dijkstra, Pim Mostert, Floris P. de Lange, Sander Bosch + 1 more
Visual perception and imagery rely on similar representations in the visual cortex. During perception, visual activity is characterized by distinct processing stages, but the temporal dynamics underlying imagery remain unclear. Here, we investigated the dynamics of visual imagery in human participants using…