There are certain (secluded) populations that do not report certain illusions (e.g., Muller-Lyer effect) as strongly as Western subjects do. Standard explanatio

There are certain (secluded) populations that do not report certain illusions (e.g., Muller-Lyer effect) as strongly as Western subjects do. Standard explanation is that, living in architecturally under-developed environments, they lack experience with corners, thereby diminishing corner-related illusions. But that's not immunity, it's merely a highly interesting artifact. Goes to show that psychology's biggest problem might be excessive reliance on college students as test subjects.