As a non-pharmacological treatment for depression, light therapy involves:
A. identifying, analyzing and ultimately changing habitually inflexible and negative cognitions about oneself, other, and the world
B. using artificial light to influence the production of melatonin and the function of the catecholamine system in seasonally depressed individuals
C. using an implanted stimulator to simulate the vagus nerve which triggers the locus coeruleus, an area in the brain from which norepinephrine neurons originate
D. stimulation of the dorsal lateral prefrontal cortex by weak electric currents induced in nerve tissue, triggering activity in the prefrontal cortex