The brainstem theory of consciousness asserts that raw, subjective experience, the "me inside," derives from computations implemented in the brainstem, not the cortex. The argument rests on philosophy's prototypical example of sentience, pain. Feeling pain does not require cortical processing. Nowhere in the cortex does electrical stimulation reliably evoke pain. Subcortical stimulation does....
Doubtless, the conscious brain integrates masses of information. But declaring that consciousness simply "emerges" when enough has accumulated, doesn't really explain how first person experience is implemented by neurons. Moreover, empirical observations challenge integrated information theory's (IIT) reliance on thalamo-cortical interactions as the information integrator. More likely, the...