Yes. Psychology must be treated cybernetically, as a historical system of self-environment relationships, which produce state changes within the self. For anyo

Yes. Psychology must be treated cybernetically, as a historical system of self-environment relationships, which produce state changes within the self. For anyone interested in "chemical imbalance" theory, I highly recommend reading Carhart-Harris and Friston's paper "REBUS": http://pharmrev.aspetjournals.org/content/71/3/316 http://pharmrev.aspetjournals.org/content/71/3/316 -- the basic gist of Friston's model is that the brain functions as a prediction engine, whose "prior probabilities" are "programmed" by past experience (within some environment). This paper addresses the role of serotonin: it reduces the "weighting" of our "prior probabilities" which gives them some malleability, meaning we can allow ourselves to adjust more fully to a new environment (or, if you flood yourself in serotonin, like with psychedelics ... it can nudge your highest-level priors, such as "who am I"?). So from this perspective, we can see depression as a mis-adjustment between one's self (i.e. adaptation to past environments) and one's current environment (no chemicals involved here), and serotonin can provide a little nudge toward re-adapting.