This in its own right has become an epiphenomenon, defined as a secondary phenomenon that makes the original phenomenon more confusing, more intractable.
This doesn't prove that consciousness is simply an epiphenomenon of physical brain activity though; it merely indicates that conscious experience is typically associated with brain (complex neural network interaction) activity.
But these differences are trivial compared to the vast gap between our mutual views and conventional science, in which consciousness emerges exclusively as an epiphenomenon of complex neuronal-level computation.
He termed the stream of consciousness an epiphenomenon; like the bell of a clock that has no role in keeping the time, consciousness has no role in determining behavior.