Papageorgio et al. also found that DMS patients had a lower P300 amplitude in the right hemisphere compared to the control group (non-DMS patients). From this result, the researchers implied that shorter P300 amplitudes are highly correlated with gray matter abnormalities; this finding is consistent with the DMS patients' characteristics and the presence of gray-matter deterioration. DMS patients were also found to have prolonged P300 lag, and their memory performance was lower than the control groups. The researchers were, thus, able to imply that DMS patients have trouble in focusing their resources to a stimulus; this was hypothesized to be caused by the neurodegeneration of the right hemisphere. Overall, other research studies have also provided evidence in the correlation of DMS and gray-matter degeneration of the right frontal region, which controls attentional resources. This research is important, because it can help determine the mechanisms of DMS, which can then help conjure a more effective target drug and/or treatment plan for those suffering from DMS.