Luiz Pessoa at Aeon Magazine:
When we consider the highways traversing the brain and how signals establish behaviourally relevant relationships across the central nervous system, we come to an important insight. In a highly interconnected system, to understand function, we need to shift away from thinking in terms of individual brain regions. The functional unit is not to be found at the level of the brain area, as commonly proposed. Instead, we need to consider neuronal ensembles distributed across multiple brain regions, much like the murmuration of starlings forms a single pattern from the collective behaviour of individual birds.
There are many instances of distributed neuronal ensembles. Groups of neurons extending over cortical (say, prefrontal cortex and hippocampus) and subcortical (say, amygdala) regions form circuits that are important for learning what is threatening and what is safe. Such multiregion circuits are ubiquitous; fMRI studies in humans have shown that the brain is organised in terms of large-scale networks that stretch across the cortex as well as subcortical territories. For example, the so-called ‘salience network’ (suggested to be engaged when significant events are encountered) spans brain regions in the frontal and parietal lobes, among others, and can also be viewed as a neuronal ensemble.
more here.
Enjoying the content on 3QD? Help keep us going by donating now.