Final answer:
Troxler's effect is the option that differentiates between physiological suppression, which is a normal perceptual phenomenon, and pathological suppression, which is due to brain dysfunction or damage.
Step-by-step explanation:
The option that implies that pathological suppression is not an extension of physiological suppression is A) Troxler's effect. Troxler's effect refers to the phenomenon where unvarying stimuli within one's peripheral visual field may fade from perception as our neurons become desensitized to unchanging stimuli over time. This is a type of physiological suppression, where the brain filters out irrelevant or unchanging information to focus on more important, changing stimuli in the environment. Pathological suppression, on the other hand, could be due to damage or dysfunction in various parts of the brain and is not merely an extension of this natural, neural adaptation process.