THE HIDDEN SPRING

A densely argued investigation of the origins of consciousness.

In this highly, sometimes overly, detailed narrative, Solms, who teaches at the Neuroscience Institute at the University of Cape Town, takes three paths to a theory of consciousness: “the elementary physics of life, the most recent advances in both computational and affective neuroscience and the subtleties of subjective experience that were traditionally explored by psychoanalysis.” These lines of investigation lead him to reject the long-held view that consciousness arises in the cerebral cortex, the locus of intelligence, but instead is to be found in a far more ancient, even primitive part of the brain, deep in the brainstem “that humans share with fishes.” The author’s insight comes from his research into dreams, phenomena that are also shared by other forms of animal life. He examines the mental behavior of hydrocephalic children, who, lacking the cortex, ought in the older theory to lack consciousness but who in fact do not. Solms’ argument, which is often repetitive, can be daunting. In part, this is because of its language, as when he writes, “accurate memory search and monitoring functions turn out to depend in part upon the cholinergic basal forebrain circuits, which constrain the ‘reward’ mechanisms of the mesocortical-mesolimbic dopamine circuit in memory retrieval.” In part, it is because he alternately takes issue with or builds on the work of other scholars of consciousness, such as Antonio Damasio and Bud Craig, familiarity with whose theories is nearly a prerequisite for readers. Still, Solms makes valuable points: He shows that consciousness is “part of nature” and not of “some parallel universe…beyond the reach of science,” and he gives a fruitful account of how memory processing, “cortical consciousness,” automaticity, and other brain functions operate. He concludes, repetitively, that “consciousness is part of nature and it is mathematically tractable.”

Readers up to date with the scholarly controversy surrounding consciousness will find this a useful addition to it.