Dim light might affect cognitive function. Image by pixabay.com
Maybe dim light is making us dumber.

Joel Soler and colleagues from Michigan State University have discovered that exposing Nile grass rats to dim light resulted in a 30% decrease in the capacity of the hippocampus and also decrease in BDNF (brain-derived neurotropic factor) which is an important peptide for brain health. The hippocampus is a critical region for learning and memory, it also translated in poor performances on spatial tasks. Surprisingly, reexposure to bright light seemed to recover the capacity of the brain and also performance on the memory task. An important research one must say since lighting conditions affecting cognitive performance might have similar effects on humans too.

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Scientific publication: onlinelibrary.wiley.com