Answer:
Behaviourists
Step-by-step explanation:
The theory of behaviourism is theory of learning in psychology that focuses on measurable observable behaviour which is influenced by environmental stimuli thereby demphasizing influence of mental processes or hereditary factors on behaviour. According to behaviourists, behaviour is conditioned by the environment and can be controlled in this way. Example from the question, behaviourists believe that parents who give reinforcement such as child-directed speech to growing children or rewards for words spoken are stimulating the child's communication skills