Joan was sitting talking with some friends when she suddenly left the room to check on her baby. she was sure she heard little emily cry out, but when she checked, emily was sleeping peacefully. based on signal detection theory, the fact that joan thought she detected a baby's cry (when no cry was present) would be considered

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities