Introverted Feeling (Fi)

Fi channels energy inward to evaluate phenomena according to an internally consistent framework of value. Its operation involves integrating observations and experiences into a coherent subjective system, producing judgments that are internally logical and precise. Fi functions independently of external validation, but continuously monitors consistency and alignment within the internal schema.

Second Function: Same modality, variable energetic toll

Extraverted Intuition (Ne)

Ne projects energy outward to detect latent connections, potential outcomes, and emergent patterns in the environment. Its process involves generating and evaluating possibilities based on observed stimuli, linking disparate elements, and continuously scanning for novelty. Ne prioritizes adaptability and responsiveness to new input rather than direct validation against objective reality.

Third Function: Opposite modality, variable energetic toll

Introverted Sensation (Si)

Si channels energy inward to interpret sensory input through subjective filters. Its process involves organizing and comparing incoming sensations to personal experiential impressions, producing internally coherent perceptual mappings. Si emphasizes qualitative and contextual representation of experiences rather than abstraction or prediction. 

Fourth Function: The polar function, least natural to utilize, most energetic toll