In his color example, Tom McGrath says the blue-associated feature activation is strongly anti-correlated with the red-associated feature activation and essentially uncorrelated with background activations.

“quite strong patterns in the coactivations of features you know if i have two features that are close together on the arc they will probably coactivate whereas if i have two features which are far away they will essentially never coactivate you know if i say that i have like the days of the week um let's give a continuous example let's say that it's like color red to blue um if something is blue it is not red”

“So, you know, my blue, like the S-A feature that is going through blue is like strongly anti-correlated with the activation of the S-A feature that is going through red and essentially uncorrelated with basically all of the background.”