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Category: neuroscience – Page 81

You can demonstrate a subjective quality like redness is different from red light. If you add a device that converts a red signal into a green one, between the retina and the optic nerve, the strawberry will seem green. It’s not about light hitting the retina, it’s about how the signal is processed. In this case, the greenness must be a quality of our conscious knowledge of the strawberry, not of the red light landing on the retina. If you use sufficient, well defined terminology, you can objectively communicate the nature of subjective qualities. For example, even though you know what it is like to see something that is red you cannot know that what happens inside my brain is the same as yours. It may be that “My redness is like your greenness, both of which we call red.” The properties of the red light are the same, but the experience the light produces could be different.

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When sensory input meets spontaneous brain activity’

https://cell.com/trends/neurosciences/fulltext/S0166-2236(24)00153-X

https://nature.com/articles/s41467-024-50102-9

Imagine your brain as a bustling city that never sleeps, constantly active even when you’re resting or not paying attention.

Continue reading “Network mechanisms of ongoing brain activity’s influence on conscious visual perception” | >

Researchers at The University of Texas MD Anderson Cancer Center have shown that therapeutically restoring ‘youthful’ levels of a specific subunit of the telomerase enzyme can significantly reduce the signs and symptoms of aging in preclinical models. If these findings are validated in clinical trials, they could have important therapeutic implications for age-related diseases such as Alzheimer’s, Parkinson’s, heart disease, and cancer.

The study, published in Cell, identified a small molecule compound that restores physiological levels of telomerase reverse transcriptase (TERT), which normally is repressed with the onset of aging. Maintenance of TERT levels in aged lab models reduced cellular senescence and tissue inflammation, spurred new neuron formation with improved memory, and enhanced neuromuscular function, which increased strength and coordination.

The researchers show that TERT functions not only to extend telomeres, but also acts as a transcription factor to affect the expression of many genes directing neurogenesis, learning and memory, cellular senescence, and inflammation.

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Neurons in the brain are like vast networks, receiving thousands of signals from other neurons through tiny structures called synapses.

Researchers from Bonn and Japan have clarified how neighboring synapses coordinate their response to plasticity signals: Nerve cells in the brain receive thousands of synaptic signals via their “antenna,” the so-called dendritic branch. Permanent changes in synaptic strength correlate with changes in the size of dendritic spines. However, it was previously unclear how the neurons implement these changes in strength across several synapses that are close to each other and active at the same time.

The researchers—from the University Hospital Bonn (UKB), the University of Bonn, the Okinawa Institute of Science and Technology Graduate University (OIST) and the RIKEN Center for Brain Science (CBS)—assume that the competition between for molecular resources and the spatial distance between simultaneously stimulated spines affect their resulting dynamics. The results of the study have now been published in the journal Nature Communications.

Neurons are the computing units of the brain. They receive thousands of synaptic signals via their dendrites, with individual synapses undergoing activity-dependent plasticity. This is the mechanism underlying our memory and thinking and reflects long-lasting changes in synaptic strength.

Continue reading “Study reveals how neighboring synapses coordinate their response to plasticity signals” | >

A nanoparticle formulation, using oligonucleotide chemistry, able to release a gene editing system with single cell resolution after near infrared laser activation. The full potential of the formulation was demonstrated in the brain after intracerebral and intranasal administrations. The spot of the laser defined the region of gene editing.

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Understanding cellular architectures and their connectivity is essential for interrogating system function and dysfunction. However, we lack technologies for mapping the multiscale details of individual cells and their connectivity in the human organ–scale system. We developed a platform that simultaneously extracts spatial, molecular, morphological, and connectivity information of individual cells from the same human brain. The platform includes three core elements: a vibrating microtome for ultraprecision slicing of large-scale tissues without losing cellular connectivity (MEGAtome), a polymer hydrogel–based tissue processing technology for multiplexed multiscale imaging of human organ–scale tissues (mELAST), and a computational pipeline for reconstructing three-dimensional connectivity across multiple brain slabs (UNSLICE).

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WEHI researchers have found a specific immunotherapy could hold promise for treating gliomas, an aggressive form of brain cancer with limited treatment options.

The new study shows that CAR T cell therapy not…

Researchers at WEHI have identified a promising new two-in-one treatment that not only targets and destroys an aggressive form of brain cancer, but also helps the immune system develop a lasting defence against it.

This dual-action approach uses a specific immunotherapy known as CAR T cell therapy to treat gliomas, an incurable brain cancer with few treatment options.

Continue reading “Two-in-one breakthrough: Cutting-edge immunotherapy could hold promise for incurable brain cancer” | >

A recent study published in Nature Communications sheds light on why emotional memories are often more vivid and lasting than non-emotional ones.

Neuroscientists recently found that specific brain waves, called ripples, help strengthen and replay emotional memories, making them more vivid and easier to remember. This discovery could lead to new treatments for memory-related conditions like PTSD.

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