निम्नलिखित मनोवैज्ञानिकों में से किसने 'प्रभाव का नियम' (Law of Effect) प्रतिपादित किया था?

The concept of 'operant conditioning' was developed as a refinement of instrumental learning theory by:

Which of the following statements is NOT a valid criticism of the behaviourist model of teaching?

Which period of learning indicates a phase of no apparent improvement in the learning curve?