Hypnosis is not considered a traditional method of investigating consciousness in Indian philosophy.

Introspection involves turning one's attention inward to examine and understand one's own subjective experiences.

Focusing on the breath is a common technique used in meditation to calm the mind and bring attention to the present moment.

Yoga is primarily practiced to improve physical and mental health, rather than as a direct method for investigating consciousness.

Dream analysis is a technique used in Indian philosophy to explore the subconscious mind and gain insights into one's consciousness.

Advaita Vedanta primarily focuses on understanding the true nature of the self and its relationship with consciousness.

Anatta, or the doctrine of no-self, is a fundamental concept in Buddhism that challenges the notion of a permanent and unchanging self.

The Nyaya school primarily focuses on analyzing the nature of knowledge and perception, and their relationship with consciousness.

Meditation is a widely practiced method in Indian philosophy for directly experiencing and exploring consciousness.

The Samkhya school primarily focuses on understanding the relationship between purusha, the pure consciousness, and prakriti, the material world.

Anekāntavāda, or the doctrine of multiple perspectives, is a fundamental concept in Jainism that emphasizes the complexity and multifaceted nature of reality and consciousness.

The Mīmāṃsā school primarily focuses on interpreting the Vedas, the sacred texts of Hinduism, and understanding their meaning and implications.

Self-inquiry, or svadhyaya, is a common practice in Indian philosophy for investigating consciousness through introspection and self-reflection.

The Vaiśeṣika school primarily focuses on analyzing the different categories of existence, including consciousness, and their relationships.

Chitta, or mind-stuff, is a fundamental concept in Yoga philosophy that refers to the underlying substance of the mind and consciousness.