Where do you get that from the article? They even say tha the memory deficits were observed in constant darkness conditions as well (and therefore due to intrin

Where do you get that from the article? They even say tha the memory deficits were observed in constant darkness conditions as well (and therefore due to intrinsic clock not extrinsic light per se). Also keep in mind that mice are nocturnal so poor memory performance late in the light period for them is probably analogous to poor memory performance during early morning for us, when there is no light.