'मनो-सामाजिक विकास के सिद्धांत' (Theory of Psychosocial Development) के प्रतिपादक कौन हैं?

Lev Vygotsky believed that through play, particularly socio-dramatic and imaginative play, a child primarily develops:

Sohan likes to explore his grandparents' house through touch. One day, he touches a hot iron and burns his hand. Sohan learns that although some objects are safe to touch, hot irons are not. According to Piaget, this modification of his existing understanding is an example of: