He is the world's leading authority on morphopsychology (facial psychology).

: Gabarre argues that 98% of personality, values, and innate competencies are determined by the unconscious, which is directly reflected in facial morphology.

Gabarre argues that the face and brain are "two sides of the same reality". His thesis, Rostro y cerebro: dos caras de una misma realidad

: He establishes that the face is the "terminal" of the neurophysiological system, meaning facial development and brain structure are intrinsically linked.