The Amygdala Hijack

What it is

Goleman was writing for general readers, building on the neuroscience available in the early 1990s, in which the amygdala was cast as the brain's fear centre. The image was vivid and it was accurate enough for its purpose at the time.

The half that holds is that acute threat degrades deliberate control. That is well supported and not in dispute. The best-evidenced version concerns working memory and top-down prefrontal control rather than anything measurable as intelligence, and a common trade-book claim that stress lowers your intelligence quotient is a different and unsupported statement.

The half that does not hold is the mechanism, and the objection comes from the researcher whose work the popular picture was built on. Joseph LeDoux argues that the amygdala detects and responds to threat but is not a fear centre and is not responsible for the conscious feeling of fear. His evidence is that people with amygdala damage lose the threat response and still feel afraid. He proposes defensive survival circuits instead, and has asked that Pavlovian fear conditioning be renamed threat conditioning. The description of one structure switching another one off is a simplification of a distributed process.

In effect

Both sides deserve stating. Goleman's defence is fair: a popular writer using a vivid image for a real experience is doing his job, and the image has helped a great many readers notice something true about themselves. Against that, the phrase has since been repeated by trainers, coaches and trade books as though it named a discovered mechanism, and the vividness is exactly what carried it past the point where it was accurate.

The way it usually arrives is the problem. Hasard Lee's The Art of Clear Thinking, at page 187, describes being hijacked by our emotions, gives it as plain anatomy, and names nobody. It is presented as a fact about how the brain works rather than as one writer's 1995 metaphor for it, and the reader has no way to learn that a metaphor is what they have been given.

The practical position is straightforward. Attribute the phrase to Goleman in 1995 and call it a popular term. Keep the observation that acute threat degrades deliberate control, and source that to the threat-processing and prefrontal literature rather than to the phrase. Do not describe the amygdala as a fear centre, and do not describe one structure as switching another off.

What it does not say

It does not name a discovered mechanism. It names an experience, in a metaphor written for general readers.

It does not describe the amygdala correctly. On LeDoux's account the structure detects and responds to threat and is not responsible for the felt experience of fear.

It does not mean one region switches another off. The process is distributed, and the switching image is the part that travelled.

It does not lower intelligence. What acute stress degrades is working memory and top-down control, which is a different claim with better evidence behind it.

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