Functional ultrasound imaging detects neural activity by computationally mapping moving red blood cells, which alter reflected acoustic patterns by up to 20 percent. Operating at frequencies up to 18 MHz, systems can achieve roughly 100-micrometer linear resolutions at acquisition speeds beyond one kilohertz. Because the human skull resists ultrasound waves, current clinical uses are confined to surgeries or subjects with specialized cranial implants. Researchers are also exploring contrast agents and gene therapies to enable super-resolution vascular mapping and direct neural tracking.
Key points
Functional ultrasound provides a smaller and cheaper alternative to functional magnetic r…: Functional ultrasound provides a smaller and cheaper alternative to functional magnetic resonance imaging without requiring large magnets.
The platform can be integrated with low-intensity focused ultrasound to modulate specific…: The platform can be integrated with low-intensity focused ultrasound to modulate specific brain regions for clinical treatments.
Future developments aim to use gene therapies and contrast agents to record neural activi…: Future developments aim to use gene therapies and contrast agents to record neural activity directly instead of monitoring blood flow.
Sources checked by our analysis pipeline: 1
Functional ultrasound imaging (fUSI) is a brain imaging modality that is just starting to be demonstrated in human studies. I’m sure many will be familiar with structural ultrasound imaging, which forms static images using ultrasound, as in a sonogram1. Functional ultrasound instead captures movies of brain tissue very rapidly, tracking subtle changes caused by the blood flow that follows neural activity.
While this is the same source of contrast as functional MRI, it has the potential to be ten times higher linear resolution (1000X the voxels), smaller (no magnet!), cheaper (no magnet!), and higher signal-to-noise. The modality naturally pairs with low-intensity focused ultrasound (LIFU, or confusingly, fUS) which focuses energy on a target area of the brain to modulate it, a new treatment option for neuropsychiatric and neurological disorders. Extensions leveraging contrast agents or gene therapies could go beyond hemodynamic responses to measure vasculature at super-resolution or even directly measure neural activity. And while ultrasound cannot easily penetrate the skull, fUSI has been demonstrated intraoperatively and in a patient that received an acoustically transparent cranial implant following reconstructive skull surgery.
Bioarchaeologists analyzing northern coastal communities found that everyday interpersonal conflict remained extremely rare over a 3,000-year span, even amid recurring climate crises and El Niño-related flooding. Published in Frontiers in Environmental Archaeology, the research suggests that ancient populations buffered against environmental instability without devolving into widespread societal warfare. These findings challenge the assumption that severe resource disruption inevitably drives localized violence.
University of Bergen scientists analyzing two decades of satellite observations found that microscopic debris scatters sunlight to create an intensifying cyan tint across the water. Although these tiny fragments comprise most individual litter pieces, they make up only a fraction of the total mass. The optical shift indicates broad-scale marine contamination that currently can only be tackled by stopping waste before it enters the sea.
University of Geneva researchers have demonstrated that complex mammalian skin patterns arise naturally through mobile cells migrating toward chemical concentrations. This chemotactic process challenges traditional theories that relied on physical tissue stretching to explain follicle spacing. The breakthrough offers broader insight into how early geometric structures like scales, feathers, and hair develop across diverse animal species.