I think Robert Sapolsky's lectures on yt cover this to some degree around 115.

https://youtu.be/wLE71i4JJiM?feature=shared

Sometimes our cortex is in charge, sometimes other parts of our brain are, and we can't tell the difference. Regardless, if we try to justify it later, that justification isn't always coherent because we're not always using the part of our brain we consider to be rational.