Open access until 7 December:
authors.elsevier.com/a/1lygsbotq7...

Lastly, we outline key questions prompted by the taxonomy we introduce. Overall, a key goal for future research is to clarify how external and internal brain processes interact - within and across dimensions - to shape experience and behaviour.

We believe that rather than endpoints on a single scale, “external” and “internal” reflect distinct dimensions - cognitive mode, attentional content, and sensory origin. In the article we further explain why these processes cannot be reduced to a single dimension of brain function.