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This chapter is devoted to reviewing some aspects of thalamic structure and function as they may contribute to making small fractions of mentation momentarily conscious, with particular emphasis on those thalamic constituents sometimes called non-specific. It offers a brief discussion of usages of the word consciousness and a few explicit assumptions about neuronal activity patterns (NAPs). The chapter employs a philosophically technical usage, following Wimsatt, who contrasts emergent with aggregative. The idea that consciousness is generated independently in different places is supported by the finding that color and motion occurring at the same time can sometimes be perceived at different times. The chapter's hypothesis suggests that for some content represented by neuronal activity pattern in cortex to be endowed with consciousness, there must be a connection between the intralaminar nuclei (ILN) and the region(s) of cortex containing those NAPs.
Wegner vacillates between considering the experience of will as a directly-sensed feeling and as a cognitive construct. Most of his book is devoted to examples of erroneous cognition. The brain basis of will as an immediately-sensed emotion receives minimal attention.
Both Block and the commentators who accepted his P versus A distinction readily recognize examples of P without A but not vice versa. As an example of A without P, Block hypothesized a “zombie,” computationally like a human but without subjectivity. This would appear to describe the disconnected right hemisphere of the split-brain subject, unless one alternatively opts for two parallel mechanisms for P?
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