The retina sends these signals to a brain region known as the hypothalamus, which passes them on to the pineal gland. The more light your brain detects, the less melatonin it produces, and vice versa.

Many non-mammalian vertebrates like fish, however, are known to detect color and brightness with the pineal gland, which is part of the brain. An Osaka Metropolitan University research group has ...

Zebrafish are known to detect color and brightness with the pineal gland, which is part of the brain. How they do so is now being elucidated. We see color because photoreceptor cones in our eyes ...

such as the hypothalamus, pituitary gland, pineal gland, thyroid gland, parathyroid glands, adrenal gland, pancreas, and the gonads (either the testes or the ovaries, depending on your sex).

Researchers have elucidated how a single photoreceptor in the pineal gland of zebrafish detects color. We see color because photoreceptor cones in our eyes detect light waves corresponding to red ...