Definition of stimulus error : an error in introspective observation of divining the object from which the stimulus comes instead of reporting the impression actually received.

What is the stimulus error give an example how in Titchener's view could the stimulus error be avoided?

How did Titchener believe the stimulus error could be avoided? The stimulus error is confusing the mental processes under study with the stimulus/object being observed. This could be avoided by describing the observation in terms of conscious content of the experience, rather than everyday language.

How did Titchener use introspection?

Introspection. The main tool that Titchener used to try to determine the different components of consciousness was introspection. Unlike Wundt’s method of introspection, Titchener had very strict guidelines for the reporting of an introspective analysis. The subject would be presented with an object, such as a pencil.