3 levels, phase synchrony (Kuramoto order)
The NOW model (Riddle & Schooler, 2024) proposes that consciousness is a hierarchy of observer windows, systems that integrate information within spatial and temporal bounds, nested across multiple brain scales with a unitary experience at the apex.
Zero phase lag within a window. Elements align in phase to form a coherent observer window. Measured by the Kuramoto order parameter.
Non-zero phase lag between peer windows. Enables communication within the same level through stable phase relations with delays.
Communication across scales. Low-frequency phase at higher levels couples to higher-frequency amplitude at lower levels (PAC).
Schooler describes consciousness as a mosaic photograph: every pixel is itself a photograph. This represents a fractal system of windows nested in windows. The Apex Window is the top-level integrator that what we typically call I or my consciousness.
The Kuramoto order parameter measures phase synchrony within a group of oscillators:
Where indicates perfect synchrony (all phases aligned) and indicates uniform phase distribution.