Before revision: Adding the prefix "neuro-" to the word "cognitive" could be considered as an example of pleonasm because, analogous to expressions like "burning fire" and "black darkness," the prefix "neuro-" arguably adds no further useful information to the term "cognitive".
After revision: Adding the prefix "neuro-" to the word "cognitive" is an example of pleonasm because, analogous to expressions like "burning fire" and "black darkness," the prefix "neuro-" adds no further useful information to the term "cognitive".