The previous post discussed how squeezing a rubber ball may temporarily boost creative thinking. There is also a twist on this brain hack that may enhance memory. A 2013 study by Ruth Propper and her colleagues found that hand clenching may enhance your ability both to remember new ideas as well as recall existing information. However, the memory boost is likely to be small.
Also, the underlying neuroscientific model is a lot more dubious. This technique is based on the HERA model (Hemispheric Encoding/Retrieval Asymmetry), which basically says that left hemisphere is responsible for encoding of the new information and right hemisphere for retrieval. Further, an easy way to increase activation of the particular hemisphere is by clenching the contralateral hand (the hand of the opposite side). Read more »