Final answer:
Research has indicated that Jean Piaget underestimated children's abilities in the concrete operational stage by not fully accounting for cultural influences and variability in cognitive development, and children's understanding of properties of objects earlier than he theorized.
Step-by-step explanation:
Research has indicated that Jean Piaget might have underestimated children's cognitive abilities in the concrete operational stage. One of the contentions is that Piaget underappreciated the role of cultural influences on cognitive development. Moreover, studies have shown that children's cognitive development is more variable and that some children acquire deductive reasoning skills at a younger age than Piaget theorized. This contradicts Piaget's suggestion of homogeneous stages of development and indicates a more continuous developmental progression. Furthermore, research has demonstrated that children can understand the properties of objects and events earlier than Piaget claimed, which also supports the idea of an earlier onset of certain cognitive capabilities.