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#AI-generated: "Do blind people have visual Near Death Experiences?" https://typeset.io/questions/do-blind-people-have-visual-near-death-experiences-3…

Do blind people have visual Near Death Experiences? | 4 Answers from Research papers
Blind people may have visual Near Death Experiences (NDEs) according to the reviewed literature. Studies suggest that the "blind" occipital cortex, which is responsible for visual processing, may be able to integrate non-visual sensory inputs and generate visuo-spatial impressions. Veridical NDEs, where the experiences are confirmed to be accurate, have been reported during general anesthesia or cardiac arrest, with visual perceptions being more common than auditory perceptions. Access to visua…

This https://arxiv.org/abs/2404.04858 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qbi…

Do the receptive fields in the primary visual cortex span a variability over the degree of elongation of the receptive fields?
This paper presents results of combining (i) theoretical analysis regarding connections between the orientation selectivity and the elongation of receptive fields for the affine Gaussian derivative model with (ii) biological measurements of orientation selectivity in the primary visual cortex, to investigate if (iii) the receptive fields can be regarded as spanning a variability in the degree of elongation. From an in-depth theoretical analysis of idealized models for the receptive fields of …

“If so-called visual, tactile, or auditory sensory cortex is actually operating using a cascade of feedback from higher levels to actively predict the unfolding sensory signals… then we should not be surprised to find extensive multimodal and cross-modal effects… even on ‘early’
sensory response.” (Clark 2011)

“These findings are exciting because they give us insight into what is happening in the brain between seeing something and saving it into memory,” says Wilma Bainbridge, assistant professor of psychology at the University of Chicago, who was not involved in the study.
“The researchers here are picking up on a cortical signal that reflects what's important to remember, and what can be forgotten early on.” 
“People tend to remember some images better than others, even when they…

Mapping the brain pathways of visual memorability
A new method combining MEG and fMRI reveals how memorable images stimulate robust and enduring responses in the ventral visual cortex, enhancing our understanding of visual memorability and brain dynamics.

This https://arxiv.org/abs/2311.07338 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A mathematical model of the visual MacKay effect
This paper investigates the intricate connection between visual perception and the mathematical modelling of neural activity in the primary visual cortex (V1). The focus is on modelling the visual MacKay effect [Mackay, Nature 1957]. While bifurcation theory has been a prominent mathematical approach for addressing issues in neuroscience, especially in describing spontaneous pattern formations in V1 due to parameter changes, it faces challenges in scenarios with localized sensory inputs. This i…

This https://arxiv.org/abs/2311.07338 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A mathematical model of the visual MacKay effect
This paper investigates the intricate connection between visual perception and the mathematical modelling of neural activity in the primary visual cortex (V1). The focus is on modelling the visual MacKay effect [Mackay, Nature 1957]. While bifurcation theory has been a prominent mathematical approach for addressing issues in neuroscience, especially in describing spontaneous pattern formations in V1 due to parameter changes, it faces challenges in scenarios with localized sensory inputs. This i…

Auditory cortex conveys non-topographic sound localization signals to visual cortex https://www.nature.com/articles/s41467-024-47546-4 "retinotopic-specific projections could potentially emerge through training in tasks that demand the integration of auditory and visu…

Auditory cortex conveys non-topographic sound localization signals to visual cortex - Nature Communications
Auditory cortex sends dense projections to layer 1 of mouse V1. Here the authors show these axons convey rich sound localization signals and that their auditory receptive fields do not align with the retinotopic map of V1.

Activation and depression of neural and hemodynamic responses induced by the intracortical microstimulation and visual stimulation in the mouse visual cortex https://iopscience.iop.org/article/10.1088/1741-2552/ad3853

This https://arxiv.org/abs/2311.07338 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

A mathematical model of the visual MacKay effect
This paper investigates the intricate connection between visual perception and the mathematical modelling of neural activity in the primary visual cortex (V1). The focus is on modelling the visual MacKay effect [Mackay, Nature 1957]. While bifurcation theory has been a prominent mathematical approach for addressing issues in neuroscience, especially in describing spontaneous pattern formations in V1 due to parameter changes, it faces challenges in scenarios with localized sensory inputs. This i…

Revolutionary wireless visual prosthesis brain implant marks two years of successful testing after surgical implantation https://www.iit.edu/news/revolutionary-wireless-visual-prosthesis-brain-implant-marks-two-yea…

Revolutionary Wireless Visual Prosthesis Brain Implant Marks Two Years of Successful Testing After Surgical Implantation
CHICAGO—April 8, 2024—The groundbreaking Intracortical Visual Prosthesis (ICVP), an implant that bypasses the retina and optic nerves to connect directly to the brain’s visual cortex, announces a s

Altered grid-like coding in early blind people https://www.nature.com/articles/s41467-024-47747-x Early blind people have a square grid map instead of a hexagonal grid map for navigation in their entorhinal cortex;

Altered grid-like coding in early blind people - Nature Communications
The contribution of visual experience to the formation of cognitive maps in humans is not well understood. Here, the authors show using fMRI and an imagined navigation paradigm, that sighted people display hexagonal grid-like neural coding, while blind people show neural representations consistent with a square grid.

Characterizing visual cortical magnification with topological smoothing and optimal transportation
Yujian Xiong, Yanshuai Tu, Zhong-Lin Lu, Yalin Wang
https://arxiv.org/abs/2404.06505

Characterizing visual cortical magnification with topological smoothing and optimal transportation
Human vision has different concentration on visual fields. Cortical magnification factor (CMF) is a popular measurement on visual acuity and cortex concentration. In order to achieve thorough measurement of CMF across the whole visual field, we propose a method to measure planar CMF upon retinotopic maps generated by pRF decoding, with help of our proposed methods: optimal transportation and topological smoothing. The optimal transportation re-calculates vertex location in retinotopic mapping, …

Apart from AI-based image decoding from brain activity, can the human brain learn to (internally) decode images from activity in its auditory cortex? I.e., mental imagery from images encoded in sound?
Meant here is the highly specific encoding of images through visual-to-auditory sensory substitution, such that mental images are in principle well-defined (after training), contrary to a brief verbal prompt for generating a mental image.

Do the receptive fields in the primary visual cortex span a variability over the degree of elongation of the receptive fields?
Tony Lindeberg
https://arxiv.org/abs/2404.04858

Do the receptive fields in the primary visual cortex span a variability over the degree of elongation of the receptive fields?
This paper presents results of combining (i) theoretical analysis regarding connections between the orientation selectivity and the elongation of receptive fields for the affine Gaussian derivative model with (ii) biological measurements of orientation selectivity in the primary visual cortex, to investigate if (iii) the receptive fields can be regarded as spanning a variability in the degree of elongation. From an in-depth theoretical analysis of idealized models for the receptive fields of …

This https://arxiv.org/abs/2404.04858 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qbi…

Do the receptive fields in the primary visual cortex span a variability over the degree of elongation of the receptive fields?
This paper presents results of combining (i) theoretical analysis regarding connections between the orientation selectivity and the elongation of receptive fields for the affine Gaussian derivative model with (ii) biological measurements of orientation selectivity in the primary visual cortex, to investigate if (iii) the receptive fields can be regarded as spanning a variability in the degree of elongation. From an in-depth theoretical analysis of idealized models for the receptive fields of …

This https://arxiv.org/abs/2401.05342 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_qbi…

Most discriminative stimuli for functional cell type clustering
Identifying cell types and understanding their functional properties is crucial for unraveling the mechanisms underlying perception and cognition. In the retina, functional types can be identified by carefully selected stimuli, but this requires expert domain knowledge and biases the procedure towards previously known cell types. In the visual cortex, it is still unknown what functional types exist and how to identify them. Thus, for unbiased identification of the functional cell types in retin…