If Dr. Matthews were examining brain scan images of healthy people of various ages, she should expect to see the largest volume of white matter in the scans of people who were approximately age:

In one elementary school curriculum, mathematical variables first appear in the sixth grade. According to Piaget, they are not introduced in the fifth grade because:

A) Preoperational children cannot reason with post conventional thinking B) children in the concrete operational stage cannot reason with hypothetical entities C) children are in capable of understanding the concept of conservation and reversibility until the beginning of the formal operational period D) Preoperational children lacks The capability of symbolic thinking

A conditioned response will not occur for all possible stimuli, indicating that an animal can learn to tell the difference between different stimuli. This is called __________

Fill in the blank(s) with correct word