Brain maturation in adolescence is both hormone-dependent and hormone-independent. This distinction is useful but imprecise, because hormone-dependent and –independent brain areas frequently interact. The social information processing network (SIPN) is an overarching model by Nelson, Leibenluft, McClure, and Pine (2005) to emphasize the synchrony between hormone-dependent and –independent maturational changes in the brain. Three neuronal circuits dedicated to the processing of social information mature at different times. The first circuitry, the detection node, is dedicated to categorizing social information and includes such areas as the inferior occipital cortex, the temporal cortex, and the fusiform face gyrus. The detection node is fully mature before adolescence.