Clenching your right hand may help form a stronger memory of an event or action, and clenching the left may help you recollect the memory later, according to researcher Ruth Propper and colleagues from Montclair State University in US.
Participants in the research study published in the journal PLOS ONE were split into groups and asked to first memorise, and later recall words from a list of 72 words.
There were four groups who clenched their hands, one group clenched their right fist for about 90 seconds immediately prior to memorising the list and then did the same immediately prior to recollecting the words.
Another group clenched their left hand prior to both memorising and recollecting. Two other groups clenched one hand prior to memorising (either the left or right hand) and the opposite hand prior to recollecting. A control group did not clench their fists at any point.
The group that clenched their right fist when memorising the list and then clenched the left when recollecting the words, performed better in memorising than all the other hand clenching groups. This group also did better than the group that did not clench their fists at all, though this difference was not statistically ‘significant’.
“The findings suggest that some simple body movements - by temporarily changing the way the brain functions - can improve memory,” said Ruth Propper, lead scientist on the study.
“Future research will examine whether hand clenching can also improve other forms of cognition, for example verbal or spatial abilities,” said Propper.
The researchers clarify that further work is needed to test whether their results with word lists also extend to memories of visual stimuli like remembering a face, or spatial tasks, such as remembering where keys were placed.
Based on previous work, the researchers suggest that this effect of hand-clenching on memory may be because clenching a fist activates specific brain regions that are also associated with memory formation.
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