Final answer:
Children from low-income families may show lower levels of cognitive development due to limited access to early education and excessive stress in the household.
Step-by-step explanation:
Research shows that children whose families have few material resources may show lower levels of cognitive development because of limited access to early education and as a result of excessive stress in the household. Children from low-income households often lack access to quality early education programs, which can hinder their cognitive development.
Additionally, the stressors associated with poverty, such as financial instability and inadequate living conditions, can negatively impact brain functioning and cognitive abilities. For example, persistent stress can affect the development of the prefrontal cortex, which plays a crucial role in cognitive processes.