PZ quotes newscientist.com :
"From such experiments, Schwartz and others argue that since the mind can change the brain, the mind must be something other than the brain, something non-material."PZ's rejoinder:
"That makes no sense. The perception of mental activity is associated with detectable changes in the activity of the brain; that is not evidence for dualism. Would it be evidence for the idea that the mind is the product of the brain if our most sensitive instruments revealed that while people composed sonnets or solved calculus problems or daydreamed about Tina Fey nude, their brains were as inert as large lumps of cold silly putty? I think not. These data are exactly what we'd expect if thought were the product of brain activity, that we'd see brain activity while people were thinking. We even have experimental evidence of correlated brain activity preceding individual awareness of conscious thought…again, as we materialists would expect." [emphasis added.]
PZ's argument, stripped of sarcasm, seems to be that if the mind were not identical with the brain, then no brain activity would be necessary for the mind's operation; the brain would sit idle, like a lump of silly putty. Therefore, if there is brain activity, then the mind is the same as the brain, and monism is justified.
Could we say that the heart is the same as blood, using the same comparison? Of course the heart moves the blood, but is not itself identical with the blood. The blood needs the heart, but is not the heart. The same goes for the brain. The mind uses the brain, but is not identical to the brain, which this data shows full well. The plasiticity of the brain shows that the mind both moves about on the brain, and that the mind can actually cause the brain to rewire itself.
Brain plasticity is an area of increasing research, including recent experiments with monkeys which showed that an artificial parallel connection between a random brain neuron and the monkey's hand could result in manipulation of the hand within 30 minutes. In other words, the mind shifted the neural activity around on the brain and rapidly found a new pathway to connect the mind to the hand. What could be more clear than that the mind is not hardwired into the brain: the brain is not the mind, any more than hardware is software.
As for pre-conscious thought activation of the brain, does a computer require booting (initializing in preparation to perform logical operations) before it can run useful software? (answer = yes). And is the software identical to the microprocessor that runs it? (answer = no).
PZ has chosen a conclusion based on his desire for an outcome, a process known as rationalization.
For a more balanced view of the brain activity than PZ uses for his examples, I suggest the MIND(sci-am) magazine article this month written by skeptic Michael Shermer. Shermer, an inveterate materialist, eviscerates the argument that all the brain scans vs. thought processes has any real meaning in the monism - dualism debate. He gives empirical reasons why the brain scans are more like phrenology (cranial bumps as locators of thought) than they are science: it is what is technologically available at the moment, so it's what gets done, gets published, and gets called science. But the statistical trimming of unwanted data, coupled with questionable averaging techniques, is rampant, and Shermer concludes that no meaningful conclusions should be based on such stuff.
PZ, however has used this type of information erroneously in drawing an unwarranted conclusion: if the brain is active during a thought, it is the thought. While this is a necessary conclusion for Philosophical Materialism, it is in no way a necessary conclusion from the data. PZ places more importance on the former, than on the latter.