Global neuronal workspace theory

1. 00:45:40 — Four-second delay from unconscious to conscious thought

Psychologist Kalina Christoff puts trained meditators in fMRI machines and asks them to press a button when a thought intrudes. Her finding: there is a four-second delay between hippocampal activity — when the thought emerges in the unconscious — and the moment the meditator becomes aware of it. In brain time, four seconds is an eon. This raises a profound question: what is happening during that transit? One theory, global neuronal workspace theory, suggests thoughts compete for access to consciousness in a Darwinian process, with only the most salient breaking through.

2. 00:48:21 — Global workspace theory: bloodless but haunting

Klein critiques global neuronal workspace theory — the idea that thoughts compete in a Darwinian process for access to conscious awareness, with only the most salient being ‘broadcast’ to the whole brain — as ‘bloodless and built on personal computers in 1998.’ Yet he finds the core intuition compelling: something in his mind is running a process he didn’t choose, deciding what enters the spotlight of attention. Pollan points out a fatal flaw: if the workspace is truly selective, why does so much triviality get through? The theory also begs its own question — if thoughts are broadcast to the whole brain, who is receiving that broadcast? This loops back to the hard problem of consciousness, where, as Pollan puts it, the scientific term ’emergent property’ sounds authoritative but is really just ‘abracadabra.’