To What Extent Do Ideas Connected By Signals of Conflict or Plot Twists Increase Reader Interest and Understanding, Compared to Ideas Joined By Signals of Agreement?

Certain types of words might act as cues helping readers map new information onto previous information. Words such as “but” can signal conflict, while words such as “and” signal agreement. To what extent do ideas joined by “but” increase reader interest and understanding, compared to ideas joined by “and?”