Scientists have discovered that a person’s choices can be influenced by brief ultrasound waves sent just before the eye moves.
The discovery shows that sound waves can be momentarily tilted as decisions are formed, subtly guiding behavior without the need for surgery or implants.
The study was led by Soha Farboud Sheshde from Radboud University. Donders Institute.
Ultrasound facilitates faster decision-making
In fast-paced computer tasks that required participants to look left and right, decisions were often made at the last minute.
At that tipping point, a short pulse of ultrasound can push selection over the line.
This effect appeared within a matter of seconds, occurring just as the brain was preparing to initiate eye movements.
Because this nudge only works during moments of hesitation, it revealed a narrow window in which external stimuli can shape behavior without replacing the brain’s own commands.
Ultrasonic pulse timing
Over repeated trials, short ultrasound pulses consistently prompted a tough decision, even when both options seemed equally balanced.
Its effect depended entirely on timing, exerting its influence precisely when the brain prepared the rapid command to initiate the eye movement.
“By simply stimulating their brains with ultrasonic vibrations, we were able to adjust their behavior within a matter of seconds,” Farboud said.
Still, this effect was observed in tightly controlled laboratory work, and more complex real-world decisions may respond very differently to ultrasound.
Target control hub
Rather than stimulating the entire brain, the team aimed to anterior segmenta small area that helps the eye start jumping.
The sound waves traveled through the skull and into that tissue, changing how easily the circuits fired during selection.
Scientists had already mapped this circuit in detail, so it served as a clear test of whether ultrasound could act at high speeds.
Pinpointing known control hubs can help separate actual brain effects from distractions such as sounds coming through the ears.
Brain chemistry is important
Post-choice brain scans showed that participants started with very different levels of natural braking signals.
These starting levels were important because the same ultrasound pulse had an amplified effect in some people and little change in others.
The magnitude of the response closely tracked levels of gamma-aminobutyric acid (GABA), a chemical that inhibits nerve cell firing, and the relationship was consistent across participants.
Such individual differences can be important in medicine when a fixed dose may work for one patient but not another.
balance without control
Any technology that influences decision-making, especially if it operates faster than consciousness, inevitably raises fears of mind control.
The ultrasound carried no information and only stimulated activity in circuits that were already biased in one direction.
“We’re not talking about human robots, we’re talking about brain support,” Farboud said of the study’s goals.
As ultrasound moves beyond experiments into clinics, schools, and workplaces, it’s important to keep the boundaries clear.
Reaching deep into the brain
Many brain circuits are tied to mood and mood. craving Surface tools lose focus and strength because they are located far below the skull.
recent guide describes low-intensity ultrasound as a non-invasive method that precisely targets the outer layers and deep tissues of the brain.
“For science, this means that for the first time we can safely study deep regions of the brain from the outside,” Farboud said.
This access could allow researchers to design tests for depression and addiction without surgery while observing behavioral changes in real time.
Safety restrictions and strict controls
Before considering ultrasound therapy, researchers must first rule out the possibility that heating effects, the formation of microscopic bubbles, or simple sounds from the device are driving the results.
Through four experiments, humans study They discovered that matching control sounds explained the effects of ultrasound waves that once hit the brain.
“I ran a number of checks, and the effects turned out to be surprisingly strong,” Farboud said.
Clear safety limits and tighter controls become even more important when the target moves from healthy volunteers to patients.
Effects of ultrasound on cells
Ultrasound is used for medical imaging, but for brain stimulation it sends pressure waves that can push on tissue.
grown in a lab neuronresearchers tracked the effects of mechanical stress on opening sensitive pores.
This mechanical pull changed the calcium levels within the cells, making them easier to send signals.
Human brains are diverse, and sounds vary depending on the skull, so no one mechanism can be assumed to explain all responses.
what happens next
If the team can standardize targeting and safety, clinicians may one day be able to add ultrasound to their growing toolbox for brain stimulation.
Pressure waves transmitted through the skull became associated with rapid selection rather than widespread changes in brain activity.
The next steps will depend on replication, better targeting to each individual, and long-term monitoring to ensure the benefits outweigh the risks.
The research will be published in a journal nature communications.
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