The effect of light stimulation during the subjective day on plasma corticosterone and gene expression in the adrenal.

CT = circadian time 30 min light pulse was started; lux = light intensity in lux; CORT = plasma corticosterone; Per1 = Period1 mRNA expression; Per2 = Period 2 mRNA expression; TH = tyrosine hydroxylase mRNA expression; PNMT = phenylethanolamine N-methyltransferase mRNA expression; + = significant increase vs 0 lux; - = not significantly different vs 0 lux dark control; nd = not determined.