It is introspection and physiological observation.

The introspection is not what is happening, but what has happened and the past is the focus of the introspection. You can detect the psychological activities occurring in the past through recalling. Moreover, it is more efficient when the person is confused, because he (she) will take the initiative to recall and analyze his own psychological activities. On the contrary, introspection the ongoing mental activity in the laboratory will interfere with the operation of this mental activity, which is dangerous and may cause psychological disorders to the subjects.

Do not make the human psychology as a black box, do not study the way of natural science, do not observe the human psychology from the outside, but observe the human psychology from the inside, that is, "introspection". Of course, this introspection is not the introspection of Wundt. And "physiological observation", like astronomers observing the universe with astronomical instruments. In fact, psychology is most similar to astronomy. Astronomy is difficult to experiment, because galaxies are too big. Similarly, psychology cannot really study with experiments because of ethical problems. So, the whole of human society is a psychological universe, where people can be equipped with tiny instruments to measure their physiological responses, and then speculate about their psychology. Of course, the measurement is not limited to the brain, mental phenomena occur on the whole body, so the physiological response of the whole body.

I am against current psychological research methods, which is against experiments and statistics. The reason is: statistical method is the commonness of statistical group, and its conclusion cannot speculate the individual. Because of ethical problems, experimental methods cannot become the mainstream method of psychological research, for a simple reason: medicine can not make experimental methods the mainstream, so neither can psychology. So, I think psychology has to return to introspection, but here's an astronomy-like approach: using instruments for physiological observation.

Do you think this method works to study psychology? Again, this "introspection" is not Wundt's "introspection", I think Wundt's introspection is wrong.

Preprint From cognitive psychology to the theory of psychological programs