I don't know the depths of his work beyond arguing for metaphysical idealism, but I research psychedelic drugs and his argument here is completely wrong.

> No, I am not kidding. Blue represents decreased brain activity. I didn’t create this figure; I downloaded it from the paper in question. Here is the direct link if you want to check it. Contrary to what the researchers claim in their reply, the findings in this paper weren’t “only modest increases in brain blood flow confined to the visual cortex”; they were of widespread decreases in activity throughout the brain.

If you actually look at the figure you see reductions in alpha activity, which would indicate increased brain activity as alpha rhythms are suppressive.

Not citing a paper here but quick copy/paste from wikipedia:

> Alpha waves are reduced with open eyes and sleep, while they are enhanced during drowsiness. Historically, they were thought to represent the activity of the visual cortex in an idle state. More recent papers have argued that they inhibit areas of the cortex not in use, or alternatively that they play an active role in network coordination and communication.

Kastrup ignores this and just states blue = less activity. He also proceeded to die on this hill and continue to try to engage in debate with actual scientists that understand EEG.

If he's this arrogant about fields he's uneducated about I'm not so interested in his philosophy.