This book explores whether there exists a distinct form of cognitive phenomenality that cannot be reduced to sensory experience. To investigate this central question in the cognitive phenomenology debate from an introspective-empirical perspective, the method of introspection is examined—along with its challenges and criticisms—through an evaluation of both historical and contemporary approaches to introspective research. In addition, a qualitative-empirical study of thinking activity is conducted to uncover performative and agentive phenomena, which may serve as arguments for a cognitively phenomenal dimension irreducible to sensory or emotional experience.