the condition of poverty imposed a mental burden akin to losing 13 IQ points, or comparable to the cognitive difference that’s been observed between chronic alcoholics and normal adults.
http://www.theatlanticcities.com/jobs-and-economy/2013/08/how-poverty-taxes-brain/6716/
http://www.theatlanticcities.com/jobs-and-economy/2013/08/how-poverty-taxes-brain/6716/