In this introductory article I summarize briefly what Topological Geometrodynamics (TGD) and TGD inspired theory of consciousness are and describe the speculative picture about biosystems as macroscopic quantum systems provided by TGD. Also the applications of TGD to brain consciousness are discussed. The identification of quantum jump between quantum histories as a moment of consciousness reduces quantum measurement theory to fundamental physics. The identification of self as a subsystem able to remain unentangled in subsequent quantum jumps provides a quantum theory of observer and one can identify self also as a fundamental statistical ensemble. The entanglement of subselves of same or of two separate selves means fusion of mental images to a more complex mental image. In the latter case it means sharing of mental images crucial, not only for remote mental interactions, but also for genuine communications.

The notion of manysheeted space-time allows to understand how biosystems manage to be macroscopic quantum systems. Topological field quantization implies that also classical fields have particle like aspects: these particle like aspects are crucial for the models of sensory qualia, sensory representations and long term memory as well as for the general model of control and coordination in living matter. One can fairly say that living systems have besides the ordinary physical body also electromagnetic body (actually a hierarchy of them). A further generalization of the space-time concept involves the introduction of p-adic topologies besides the real topology. p-Adic space-time regions are identified as cognitive representations for the real regions and thus correspond to the 'mind stuff' of Descartes. The transformation of intention to action correspond to a quantum jump in which p-adic space-time regions is replaced with a real one. The realization of the sensory representations at the field body outside the brain represents the most radical departure from the views of standard neuroscience and a rather detailed theory for both 'personal' sensory representations and magnetospheric sensory representations presumably responsible for the third person aspects of consciousness results.

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