Dissociating hippocampal and basal ganglia contributions to category learning using stimulus novelty and subjective judgments

► Different subjective correlates of hippocampal and striatal activity in categorization. ► Striatum is recruited during both conscious and unconscious categorization. ► Posterior hippocampus contributes to episodic memory-based categorization. ► Posterior hippocampus and basal ganglia interact during categorization. ► Anterior hippocampus is modulated by novelty, not categorization learning.