Can ‘random noise’ unlock our learning potential?


  • There is an increase in the use of tRNS for enhancing human perception and cognition.
  • tRNS can improve perception which might boost neuroplasticity and learning.
  • tRNS has a potential clinical application.
  • More research investigating the working mechanisms are needed.

Edith Cowan University (ECU) has investigated the effects of transcranial random noise stimulation (tRNS) in a variety of settings and found the technology could have many applications. Despite its name, tRNS doesn’t utilize noise in the everyday, auditory sense of the word. Rather, it sees electrodes attached to the head so a weak current can pass through specific parts of the brain.

Study lead Dr Onno van der Groen said the study showed tRNS has promise as a tool to assist people with compromised learning capabilities. “The effect on learning is promising: it can speed up learning and help people with neurological conditions,” Dr van der Groen said. “So, people with learning difficulties you can use it to enhance learning rate, for example. “It’s also been trialled on people with visual deficits, such as after stroke and traumatic brain injury.

“When you add this type of stimulation during learning, you get better performance, faster learning and better attention afterwards as well.”

Forming new pathways

Dr van der Groen said tRNS works by allowing the brain to form new connections and pathways, a process known as neuroplasticity. “If you learn something, there has to be neuroplastic changes in your brain, which allows you to learn this information,” he said. “And this is a tool to enhance this neuroplasticity.”

Dr van der Groen said tRNS had two effects on the brain: the ‘acute’ effect, which allows a person to perform better while undergoing tRNS, and the modulating effect which saw lasting results.

“If you do 10 sessions of a visual perception task with the tRNS and then come back and do it again without it, you’ll find you perform better than the control group who hasn’t used it,” he said.

“Limitless” potential?

The idea of expanding one’s learning potential via tech such as tRNS raises many questions.

While it’s most pertinent to those with deficiencies and difficulties in learning, it also begs the question as to whether a neurotypical person can take their intelligence to new levels, similar to the concept in the movie ‘Limitless’.

Dr van der Groen says the potential is there, but there are also signs it won’t create a ‘new level’ of intelligence. “The question is, if you’re neurotypical, are you already performing at your peak,” he said.

“There’s a case study where they tried to enhance the mathematical skills of a super mathematician; with him, it didn’t have much of an impact on his performance, presumably because he is already a top performer in that area. “But it could be used if you’re learning something new.”

Source- Science News Daily:

Journal Reference:

  1. Onno van der Groen, Weronika Potok, Nicole Wenderoth, Grace Edwards, Jason B. Mattingley, Dylan Edwards. Using noise for the better: The effects of transcranial random noise stimulation on the brain and behaviorNeuroscience & Biobehavioral Reviews, 2022; 138: 104702 DOI: 10.1016/j.neubiorev.2022.104702