Laughing puts the brain in a meditative state: “Things are simple: the less stress one has, the better his memory is,” says Dr. Lee Berk, who took part in the study. “Humor reduces the destructive action of hormones associated with stress such as cortisol, which acts on hippocampal neurons responsible for memory function, and reduces the levels of blood pressure, thus improving our mood” explains the researcher."“Things are simple: the less stress one has, the better his memory is,” says Dr. Lee Berk, who took part in the study. “Humor reduces the destructive action of hormones associated with stress such as cortisol, which acts on hippocampal neurons responsible for memory function, and reduces the levels of blood pressure, thus improving our mood” explains the researcher."