In like manner the context of a visual sensation for physics is physical, and outside the brain. Going backward, it takes you to the eye, and thence to a photon and thence to a quantum transition in some distant object. The context of the visual sensation for psychology is quite different. Suppose, for example, the visual sensation is that of a telegram saying that you are ruined. A number of events will take place in your mind in accordance with the laws of psychological causation, and it may be quite a long time before there is any purely physical effect, such as tearing your hair, or exclaiming "Woe is me!"
Source: Bertrand Russell : Mind and Matter (1950?)
More info.:https://russell-j.com/beginner/19501110_Mind-Matter150.HTM