“Locke’s ideas about the human consciousness being entirely determined by surroundings and external stimuli ...”
That was not locke’s idea at all. Locke did not believe the content of the mind was “determined,” but developed by the volitional effort to reason about what we are conscious of—what he call “reflection.” It was Hume who introduced the idea the mind as “determined.” Hume denied volition, Locke did not.
Hank