Severity: Warning
Message: fopen(/var/lib/php/sessions/ci_session1mqcrb1jt5rldqifdvkd5l85s2s524v3): Failed to open stream: No space left on device
Filename: drivers/Session_files_driver.php
Line Number: 177
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Severity: Warning
Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)
Filename: Session/Session.php
Line Number: 137
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Visual object information is conveyed from V1 to area TE along the ventral visual pathway with increasing receptive field (RF) sizes. The RFs of TE neurons are known to be large, but it is largely unknown how large RFs are shaped along the ventral visual pathway. In this study, we addressed this question in two aspects, static and dynamic mechanisms, by recording neural responses from macaque area TE and V4 to object stimuli presented at various locations in the visual field. As a component related to static mechanisms, we found that in area TE, but not in V4, response latency to objects presented at fovea were different from objects in periphery. As a component of the dynamic mechanisms, we examined effects of spatial attention on the RFs of TE neurons. Spatial attention did not affect response latency but modulated response magnitudes depending on attended location, shifting of the longitudinal axis of RFs toward the attended locations. In standard models of large RF formation, downstream neurons pool information from nearby RFs, and this process is repeated across the visual field and at each step along the ventral visual pathway. The present study revealed that this mechanism is not that simple: ) different circuit mechanisms for foveal and peripheral visual fields may be situated between V4 and area TE, and ) spatial attention dynamically changes the shape of RFs. Receptive fields (RFs) of neurons are progressively increased along the ventral visual pathway so that an RF at the final stage, area TE, covers a large area of the visual field. We explored the mechanism and suggested involvement of parallel circuit mechanisms between V4 and TE for foveal and peripheral parts of visual field. We also found a dynamic component of RF shape formation through attentional modulation of responses in a location-dependent manner.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5646204 | PMC |
http://dx.doi.org/10.1152/jn.00348.2017 | DOI Listing |
Neuroimage
March 2025
Mind, Brain and Behavior Research Centre (CIMCYC), and Experimental Psychology Department, University of Granada, 18071 Granada, Spain.
Background: Spatial attention enables the selection of relevant over irrelevant stimuli through dorsal and ventral fronto-parietal networks. These networks are connected through long white matter tracts, such as the superior longitudinal fasciculus (SLF) and the Inferior Fronto-Occipital fasciculus (IFOF).
Objective/hypothesis: The main purpose of this study was to explore, in healthy participants, the causal role of the right Inferior Parietal Lobe (rIPL) in spatial orienting and conscious perception.
Injury
March 2025
Dallas Orthopedic and Shoulder Institute, 222 South Collins Road Suite 101, Sunnyvale, TX 75182, USA. Electronic address:
Background: Assessment of intraoperative syndemsotic instability remains a controversial topic. To date, no study has directly compared 5 available methods.
Materials And Methods: The purpose of the present study was to assess the reliability of five stress assessment methods (Cotton Hook, External Rotation, Arthroscopic, Direct Palpation, and Direct Visualization) across various syndesmotic injury conditions (ventral disruption, 2-ligament injury, and 3-ligament injury) in an in-vitro model.
IEEE Trans Neural Netw Learn Syst
March 2025
Considerable interindividual variability exists in electroencephalogram (EEG) signals, resulting in challenges for subject-independent emotion recognition tasks. Current research in cross-subject EEG emotion recognition has been insufficient in uncovering the shared neural underpinnings of affective processing in the human brain. To address this issue, we propose the parallel contrastive multisource domain adaptation (PCMDA) model, inspired by the neural representation mechanism in the ventral visual cortex.
View Article and Find Full Text PDFHum Brain Mapp
March 2025
Department of Radiology, University of Calgary, Calgary, Alberta, Canada.
The human brain is organized into several segregated associative and sensory functional networks, each responsible for various aspects of cognitive and sensory processing. These functional networks become less segregated over the adult lifespan, possibly contributing to cognitive decline that is observed during advanced age. To date, a comprehensive understanding of decreasing network segregation with age has been hampered by (1) small sample sizes, (2) lack of investigation at different spatial scales, (3) the limited age range of participants, and more importantly (4) an inadequate consideration of sex (biological females and males) differences.
View Article and Find Full Text PDFHandb Clin Neurol
March 2025
Sorbonne Université, Institut du Cerveau/Paris Brain Institute-ICM, Inserm, CNRS, APHP, Hôpital de la Pitié Salpêtrière, Paris, France. Electronic address:
Despite our subjective experience of a largely symmetric visual world, the human brain exhibits varying patterns and degrees of hemispheric asymmetry in distinct processes of visual cognition. This chapter reviews behavioral and neuroimaging evidence from neurotypical individuals and neurological patients, concerning functional asymmetries between the right hemisphere (RH) and the left hemisphere (LH) in visual object processing and mental imagery. Hierarchical perception shows RH preference for global processing and LH preference for local processing.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!