{"ok":true,"nota":{"id":"738f4568103d4c9d","slug":"medir-la-sangre-en-distintos-tramos-de-los-vasos-del-cerebro-para-ente-738f45","titulo":"Medir la sangre en distintos tramos de los vasos del cerebro para entender mejor cómo responde","resumen":"Investigadores midieron con resonancia magnética la velocidad y el momento en que la sangre cambia en distintos tramos de la red de vasos cerebrales cuando la persona mira un estímulo visual. Compararon arterias, microvasos y venas para ver cómo se encadena la respuesta.","fuente":"biorxiv","fuenteNombre":"bioRxiv · preprints","color":"#be2628","autor":"Hu, Z., Hartung, G. A., Proulx, S., Varadarajan, D., Bollmann, S., Rosen, B. R., Polimeni, J. R.","url":"https://www.biorxiv.org/content/10.64898/2026.10.16.759420v1?rss=1","imagen":"/hoy/portada/738f4568103d4c9d","tema":"ciencia","subtemas":["resonancia magnetica","flujo sanguineo cerebral","neuroimagen","vasos sanguineos","respuesta visual"],"entidades":["bioRxiv"],"formato":"dato","entretenimiento":false,"pubTs":"2026-10-22T00:00:00.000Z","indexTs":"2026-10-22T22:31:26.226Z","hash":"e1e8069f5be7b37fd2da35899caec37ca9914682c21a259d19d32384c231cf7a","tsa":{"time":"Oct 22 22:32:09 2026 GMT","provider":"freetsa.org","sobre":"sello"},"stats":{"views":0,"likes":0,"clicks":0,"dwell":0},"tipo":"normal","registro":"hallazgo","porQueImporta":"Hasta ahora, las resonancias funcionales miden sobre todo lo que pasa en los capilares, pero ese dato llega ya mezclado con lo que ocurre en venas y arterias. Separar cada tramo permite saber con más precisión de dónde sale la señal que usan los médicos y los científicos para ver qué zona del cerebro está trabajando. Para alguien de acá, esto mejora la lectura de los estudios de cerebro que salen en las noticias, aunque todavía falta mucho para llevarlo a un diagnóstico cotidiano.","quienFirma":"Universidad no especificada en el resumen (preprint de bioRxiv)","confianza":"preprint","consulta":null},"sello":{"hash":"e1e8069f5be7b37fd2da35899caec37ca9914682c21a259d19d32384c231cf7a","sello":"ad04244b4a5da076e1a7fc257f24b48dcc1e9a1ca303962e29867f0f06f91ee9","beacon":{"drand":{"cadena":"8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce","ronda":6575910,"aleatorio":"ad632c470ba8c968ea920b116993e6a501688139a43318de64f5a7ea72e81de2","tiempo":"2026-10-22T22:32:00.000Z"},"nist":{"cadena":2,"pulso":1995154,"salida":"A32727015042185E787530FED53F828C26131B55C644F3F364155FFBAB02AAA2930B78FFEE6913417A86FA34480E1F05FB9B4984B59D1A0E007BB8E6E3A95F8F","tiempo":"2026-10-22T22:31:00.000Z"},"noAntes":"2026-10-22T22:32:00.000Z"},"verificacion":{"drand":true,"nist":true},"tsa":{"time":"Oct 22 22:32:09 2026 GMT","provider":"freetsa.org","sobre":"sello"},"original":{"titulo":"Progression of visual-stimulus-evoked blood velocity response timing across the vascular network measured with individual-vessel phase-contrast fMRA","descripcion":"Most functional MRI (fMRI) studies of brain function aim to measure hemodynamic responses arising from the microvasculature within the tissue parenchyma, where spatial and temporal coupling with neuronal activity is thought to be tightest. However, the measured hemodynamic responses emerge from an interconnected vascular network that includes upstream feeding arteries, downstream draining veins, and the intervening microvascular compartments. Directly measuring and comparing vascular responses across multiple stages of this network may therefore provide more specific information about network-level hemodynamics--and how hemodynamics in one stage of the vascular hierarchy influence hemodynami","pubDate":"2026-10-22","url":"https://www.biorxiv.org/content/10.64898/2026.10.16.759420v1?rss=1"},"indexado":"2026-10-22T22:31:26.226Z"}}