# Varieties of cognitive penetration in visual perception Petra Vetter and Albert Newen **Keywords:** Cognitive penetration Visual perception Early visual processes V1 Top-down modulation Contextual influences Predictive coding Perception–cognition boundary Philosophy of mind **Opening (not a real abstract):** Cognitive penetration Visual perception Early visual processes V1 Top-down modulation Contextual influences Predictive coding Perception–cognition boundary Philosophy of mind **Authors:** [[Consciousness and Cognition]]