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Rats taught to drive tiny cars for a reward find the learning relaxing, research finds
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  • Rats taught to drive tiny cars for a reward find the learning relaxing, research finds

Rats taught to drive tiny cars for a reward find the learning relaxing, research finds

Agence France-Presse • October 24, 2019, 13:18:34 IST
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The study shows potential for new avenues of mental health treatment, where behaviour could change neurochemistry.

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Rats taught to drive tiny cars for a reward find the learning relaxing, research finds

Sometimes life really can be a rat race. US scientists have reported successfully training a group of the rodents to drive tiny cars in exchange for bits of Froot Loops cereal, and found that learning the task lowered their stress levels. Their study not only demonstrates how sophisticated rat brains are, but could one day help in developing new non-pharmaceutical forms of treatment for mental illness, senior author Kelly Lambert of the University of Richmond told AFP on Wednesday. Lambert said she had long been interested in neuroplasticity — how the brain changes in response to experience and challenges — and particularly wanted to explore how well rats that were housed in more natural settings (“enriched environments”) performed against those kept in labs. [caption id=“attachment_7548261” align=“alignnone” width=“1280”]Scientists are teaching rats how to drive. Scientists are teaching rats how to drive. Image credit: Kelly Lambert/UoW[/caption] She and colleagues modified a robot car kit by adding a clear plastic food container to form a driver compartment with an aluminum plate placed on the bottom. A copper wire was threaded horizontally across the cab to form three bars: left, center and right. When a rat placed itself on the aluminum floor and touched the wire, the circuit was complete and the car moved in the direction selected. Seventeen rats were trained over several months to drive around an arena 150 centimeters by 60 centimeters made of plexiglass. Writing in the journal Behavioural Brain Research, the researchers said the animals could indeed be taught to drive forward as well as steer in more complex navigational patterns. As she had suspected, Lambert found that the animals kept in stimuli-rich environments performed far better than their lab rat counterparts, but “it was actually quite shocking to me that they were so much better,” she said. [caption id=“attachment_7548271” align=“alignnone” width=“769”]Rats have mastered the art of driving a tiny car, suggesting that their brains are more flexible than we thought. Image credit: Kelly Lambert/UoW Rats have mastered the art of driving a tiny car, suggesting that their brains are more flexible than we thought. Image credit: Kelly Lambert/UoW[/caption] The rats’ feces was collected after their trials to test for the stress hormone corticosterone as well as dehydroepiandrosterone, which counters stress. All rats that underwent training had higher levels of dehydroepiandrosterone, indicating a more relaxed state, which could be linked to the satisfaction of gaining mastery over a new skill, referred to as “self-efficacy” or “agency” in humans. What’s more, rats that drove themselves showed higher levels of dehydroepiandrosterone as compared to those who were merely passengers when a human-controlled vehicle, meaning they were less stressed — something that will be familiar to nervous backseat drivers. The biggest takeaway for Lambert was the potential for new avenues of treatment the work opened up for people suffering from mental health conditions. “There’s no cure for schizophrenia or depression,” she said. “And we need to catch up, and I think we need to look at different animal models and different types of tasks and really respect that behavior can change our neurochemistry.”

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Health Mental health stress depression Schizophrenia Relaxation mindfulness stress hormone neuroplasticity neurochemistry
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