If Robert suffers from bipolar disorder; which of the following neurochemical conditions will be observed in his case? Low serotonin levels coupled with low levels of norepinephrine in the manic phase Low serotonin levels coupled with low levels of norepinephrine in the depressed phase High serotonin levels coupled with high levels of norepinephrine in the depressed phase High serotonin levels coupled with low levels of norepinephrine in the manic phase'