Lecture VII

But you cannot get a true conception of sensation from the way it is described in current books on psychology. When the psychologists speak of sensation they say: in the external world a certain physical process is going on, vibrations in the light ether or waves in the air; this streams on to our sense organ and stimulates it. People speak of stimulus, and they hold to the expression they form, but will not make it comprehensible. For through the sense organ the stimulus releases sensation in our souls, the wholly qualitative sensation which is caused by the physical process (for example by the vibration of air waves in hearing). But how this comes about neither psychology nor present-day science can tell us. This is what we generally find in psychological books.