To explain the human universality and variability of emotions, ekman and his associates

Ekman and his associates monitored the brain waves of participants to determine which hemisphere had higher activation.

Explanation:

Paul Ekman was a great researcher about human universality and the variability of emotions. For him, emotions are our first response to situations. These are basic mechanisms that include changes in our physiology, subjective experiences, and behaviors. During the experiments, one way that Ekman and his companions found to understand the universality and variability of emotions was to monitor the brainwaves of the subjects participating in the research to determine which cerebral hemisphere had the most activation in a given situation that influenced a specific reaction.

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