A Test for Consciousness?

Consciousness-testing-machineRiccardo Manzotti and Tim Parks at the NYRB:

Will we ever really know what, or even where, consciousness is? Is there any way to get at it scientifically, conclusively? Week by week we hear claims from neuroscientists that would appear to confirm the prevailing “internalist” view of consciousness. If the brain creates a representation in our heads of the world around us through the firing of neurons, the argument goes, then we can identify neural activity that corresponds to particular aspects of consciousness. They tell us that if this part of the brain is damaged it will affect our eyesight. If that part suffers, we will have difficulty moving through space. They show us images based on scans of electrical and chemical activity in the brain and how those images change when our experience changes. Yet there has been no progress in bridging the gap between this activity in the brain and the nature of our experience, the richness of our sensations of color, sound, touch, motion, or simply awareness.

How, then, can the internalist theory be tested and demonstrated scientifically? Will it ever really be possible to prove beyond all doubt that this neural activity is our experience? And if that can’t be done, is there any proof for an alternative account of consciousness? What about the hypothesis that Riccardo Manzotti has been setting out in these dialogues, that consciousness is actually external to the body? Are there any scientific experiments that could settle this debate?

more here.