The research method in which an investigator manipulates one or more factors to observe the effect on some behavior or mental process is called an experiment.
What are Mental process?
All of the functions that the human brain is capable of naturally are included in mental process. Memory, feeling, perception, imagination, thought, and reasoning are all common mental functions. Mental processes are continually relevant and influencing or taking in events from daily life since the human mind is constantly functioning. Mental processes are of uttermost significance to a user experience designer. The design will be adapted to the capability of that mental process, for instance, if the designer is aware of the characteristics and constraints of a mental process, such as memory.
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