hi deli, i couldn't help but reply...i watched a show on pbs where when they probed a certain part of the brain, (the patient was awake), the room get brighter for her. so this has been documented with a person who had severe depression. they had researched for several years until they thought they ahd identified the part of the brain that is affected by depression. sure enough when they probed that area she reported this difference. in her case they used that procedure where they implant a device that stimulates that part of the brain. it's a fairly new concept and procedure. my sister considered it cause she has severe, chronic depression. it allows the patient to not have to take meds.i know this sounds a little sci-fi but it is factual. i don't know if the docs were even expecting this result she reported. so you are right on about things being brighter when u are feeling better.