Not looking to start a long drawn out fight here but there is more than one way to look at an object.
We are used to thinking of an object as some pattern or sequence in a map that reliably signals some object - usually some perceived object.
When you think of a behaviour you have to ask “how is that stored in the cortex.” Again, it is likely to be some pattern or sequence. This is about the same thing as an object; cortex is pretty agnostic in what is stored in it.
I see an affordance as the union of the cluster of features that make up your perception and the cluster of features for behavior that happens to be the best fit to your perception. An affordance.
I think of it as the senses priming the selections of possible behavior implementations, with some drive coming out of the subcortical structures as a strong template for these behaviors.
This is all very high-concept at this point so what does it look like in practice?
Perception -> what/where stream -> Association hub & temporal lobe -> subcortical structures -> lower forebrain -> unfolding into some action -> motor drivers -> action!
The spatial extents are hard to put into words so maybe these drawings will help. As it is these are pretty busy - if I put this all in a single drawing it would be incomprehensible.
These are the parts I will be describing below. I broke out the sub-cortical structures for clarity in this structure key. In the following illustrations, the sequence is color coded to match the descriptive text below the picture.
What I am highlighting here is the lobe-to-lobe connections.
This last bit is the priming of action plan selection based on what is being perceived.
This is also includes some lobe-to-lobe connections.
In this sequence the sensory stream has object features that are collected in the association regions that communicate with both the temporal lobe and the frontal lobe. These object are composed of features that are stored with built in judgement of positive and negative associations during exploration and learning so that in planning these object stores contribute to action selection. The “objects” stored in the different regions of the brain are vastly different but the common lingua franca of hex-grid coding allows inter-communications.