 Beta oscillations in the brain have been shown to be important for the reactivation of cortical representations during working memory and decision making. This study examined how beta activity in the dorsal-actual prefrontal cortex, DLPFC, and pre-supplementary motor area, pre-SMA, was related to the content of a stimulus regardless of its objective properties. The researchers found that two distinct beta-band frequencies were consistently associated with the two relative categories, with activity in these bands predicting the animal's responses. They also demonstrated that DLPFC and pre-SMA are connected via these distinct frequency channels. These results suggest that beta oscillations play a key role in forming neural ensembles, and further show that these ensembles synchronize at different beta frequencies. This article was offered by Eli Rassi, Yi Zhong, German Mendoza, and others.