The book introduces a radically new way of thinking about information
and the important role it plays in living systems. It opens up new
avenues for exploring how cells and organisms change and adapt, since
the ability to detect and respond to meaningful information is the key
that enables them to receive their genetic heritage, regulate their
internal milieu, and respond to changes in their environment. It also
provides a way of resolving Descartes' dilemma by explaining the
workings of the brain in non-mechanical terms that are not tainted by
spiritual or metaphysical beliefs. The types of meaningful information
that different species and different cell types are able to detect are
finely matched to the ecosystem in which they live, for natural
selection has shaped what they need to know to function effectively in
those circumstances. Biological detection and response systems range
from the chemical configurations that govern genes and cell life to the
relatively simple tropisms that guide single-cell organisms, the
rudimentary nervous systems of invertebrates, and the complex neuronal
structures of mammals and primates. The scope of meaningful information
that can be detected and responded to reaches its peak in our own
species, as exemplified by our special abilities in language, cognition,
emotion, and consciousness, all of which are explored within this new
framework.