Which type of theorist would be most likely to describe intellectual development in terms of qualitative changes in thought with age (e. g., transformation from a caterpillar to a butterfly)? a. an information-processor b. a psychometrician c. a piagetian d. a vygotskyian?

The answer is "a piagetian".

Piaget was the first one of those who study psychological theories to make a deliberate investigation of youngsters' psychological improvement. Cognitive Development is Jean Piaget's hypothesis. Through a progression of stages, Piaget proposed four phases of psychological improvement:

1) the sensorimotor

2) preoperational

3) concrete operational

4) formal operational period.

answer; john b watson,(observable behavior);