A unifing theory of spatiotemporal brain dynamics should incorporate multiple spatial and temporal scales. Between the microscopic (local) and macroscopic (global) components proposed by Nunez, mesoscopic (intermediate-range) elements should be integral parts of models. The corresponding mathematical formalism requires tools of nonlinear dynamics and the use of aperiodic (chaotic) attractors. Some relations between local-mesoscopic and mesoscopic-global components are outlined.

Spatio-temporal neuro-dynamics is a quickly developing field of brain research and Tsuda's work is a significant contribution toward establishing theoretical foundations in this area. It is conceivable that the fragmented attractor landscapes and dynamical memory patterns identified earlier in various K-sets are biologically plausible manifestations of attractor ruins, chaotic itinerancy, and Cantor encoding as applied to sensory information processing.

Subjective experience suggests that we continuously observe, perceive, and evaluate the environment as we make decisions and intentional actions. The percept of continuity of our cognition, however, is an illusion. In the past decades, ample experimental evidence has been accumulated indicating that cognition evolves through a sequence of discontinuities and transients, and there are discernable neural processes correlating with the cognitive sequences. These discontinuities are crucial in the intentional action-perception cycle, as they mark the cognitive 'aha' moment of deep understanding (...) and conscious insight. Walter Freeman developed a hierarchical model to describe these physiological findings, culminating in the cinematic theory of cognition. Following the traditions of metastability, transient neurodynamics, and brain chaos, discontinuities are described as phase transitions in the cortical neuropil. This approach not only leads to deep theoretical insights of neural correlates of cognition and consciousness, but it also helps to form a conceptual framework to create artificially intelligent devices that are in harmony with humans and serve peaceful development of humanity. (shrink)