Darkness will naturally cause your pupils to dilate, since they are opening up to let it more light from the surroundings. Light causes the pupil to contract. Knowing this, how could you design a classical conditioning experiment forcing the pupils to dilate?

In a study, people were asked to imagine simple occasions that made them happy and to remember events that made them feel proud about themselves. it was observed that the subjects developed an increasingly positive attitude. these changes are known to be healthy, leading to greater physical activity and reducing unhealthy habits. based on this excerpt, we can conclude that a positive attitude .