Poverty has been shown to impede cognitive function. One way in which this may happen is that financial worries put a severe burden on one's mental resources so that they are no longer fully available for solving complicated problems. The reduced capability for problem solving can lead to suboptimal decisions and further perpetuate poverty. Many other pathways from poverty to compromised cognitive capacities have been noted, from poor nutrition and environmental toxins to the effects of stress on parenting behavior, all of which lead to suboptimal psychological development. Neuroscientists have documented the impact of poverty on brain structure and function throughout the lifespan.