Nearly two decades later, more came to be known about the impacts of high epinephrine. Studies suggest glucose, together with epinephrine from the adrenal medulla have an effect on memory. Although high doses of epinephrine have been proven to impair memory, moderate doses of epinephrine actually enhance memory.[7] This leads to questioning the role that epinephrine has played on the evolution of the genus Homo as well as epinephrine's crucial role during fits of rage. The crucial role that astrocytes play in the formation of muscle memory may also shed light on the beneficial impact of meditation and deep breathing as a method of managing and controlling one's rage.