[MizzDaizzy]

To get back to Watson and behaviourist psychologists, their argument was that we cannot observe the mind of anyone else directly, so we should explore what can be observed of human behaviours directly, much as we do with other animals, some of whom seem to learn from their experiences, others to act only on inborn reflexes.

One problem with this, of course, is that we cannot, ethically, spy on humans when they engage in various activities, deemed private, unless they volunteer to be spied on, and maybe those who volunteer are different from other people in important ways.