Study Shows Brain Signals Only Matter if They Arrive on Time

> Signals are processed only if they reach the brain during brief receptive cycles. This timing mechanism explains how attention filters information and may inform therapies and brain-inspired technologies.

> A research team led by neuroscientists Andreas Kreiter and Eric Drebitz has now delivered the first causal evidence for how the brain selects and processes important information.

> “Whether a signal is processed further in the brain depends crucially **on whether it arrives at the right moment, during a short phase of increased receptivity of the nerve cells**,” explains Drebitz. “Nerve cells do not function continuously, but in rapid cycles. They are highly active and receptive **for just a few milliseconds**, followed by a period of lower activity and responsiveness. This cycle repeats roughly **every 10 to 20 milliseconds**. Only when a signal arrives just before the peak of this active phase does it alter neuronal behavior.”

> This precise timing is **the core principle of information processing.** Attention takes advantage of this mechanism by adjusting the rhythm of nerve cells so that relevant signals reach them within the receptive window, while irrelevant signals are filtered out.

> In order to prove the cause of this fundamental mechanism of our brain, selective stimulus transmission was studied in rhesus monkeys, a species that is very similar to humans in the organization of the cerebral cortex. “The artificially triggered signals only influenced the activity of the nerve cells in V4 when they arrived during a short phase of increased receptivity. If the same signal arrived too early or too late, it had no effect.”

This could make for the basis of some (inaccurate, but cool) sci-fi story where some hidden beings only do things in sight of people in the juddery intervals when the resulting visual information would utterly fail to be processed, making them effectively impossible to track and react to properly.