Working Memory & Near-Infrared Light Research

You compare two meeting times, keep the first sentence of a paragraph in mind, or remember a number long enough to type it into a form. Each moment calls on working memory: the ability to hold information in mind while using it.

Thinking of it as a temporary mental workspace helps explain why scientists study it. It is a specific part of cognition that can be examined through carefully designed tasks, making it a useful starting point for research on brain function and near-infrared light.

Making a mental workspace measurable

Imagine seeing several colored squares for a moment. They disappear. A square then appears again, and you decide whether its color has changed.

By varying how many items appear and recording correct answers and false alarms, researchers can estimate how much visual information a person holds during the brief delay. This provides a more defined outcome than asking whether someone generally feels sharper.

A 2022 study in Science Advances used tasks involving colors and orientations to investigate transcranial photobiomodulation, or tPBM. Participants completed active and sham sessions in a blinded design, allowing researchers to compare performance under both conditions. Read the study.

What the study found

The researchers reported improved visual working-memory capacity following a 12-minute application of 1064nm laser light over the right prefrontal region, compared with sham stimulation. They also recorded EEG during the memory tasks.

An EEG measure associated with holding visual information, called contralateral delay activity, changed alongside task performance. Bringing these measurements together helped the team investigate both what participants could remember and the brain activity associated with maintaining that information.

The study also examined different conditions. The same pattern of benefits was not observed with 852nm light over the right prefrontal region or 1064nm light over the left prefrontal region. These comparisons make the wavelength and stimulation location part of the finding. Study results and methods.

Adult recalling a short grocery list while placing items into a reusable bag, illustrating working memory in everyday life.

Reading the result in context

This is an encouraging example of human research connecting a defined cognitive outcome with a related physiological measurement. Its strongest conclusion concerns the visual tasks, participants, and experimental protocol that were tested.

Applying that result to everyday work, long-term memory, or a different device requires further evidence. The study did not test Brainlume, 810nm LEDs, or its 10Hz and 40Hz modes. It also did not compare 810nm directly with 1064nm.

For a reader exploring brain wellness, the useful question is: “What exactly changed, and how was it measured?” That question makes it easier to distinguish a memory-task result from a broad claim about mental performance.

Bringing curiosity into your daily routine

At Brainlume, we use everyday language such as focus, wind-down, and recovery to describe the routines our wearable is designed for. Research offers a way to explore the underlying science with more precision.

Working memory is one part of that picture. Understanding how it is studied can make both scientific papers and product information easier to evaluate.

Explore the science behind Brainlume.