Persistence refers to the tendency to continue using strategies that have been successful in the past, even when they may not be effective for solving new problems. It is the act of sticking to familiar methods rather than adapting to new situations.
Fixation is a cognitive bias where an individual becomes stuck on one particular way of thinking or problem-solving and fails to consider other possible approaches.
Insight refers to sudden and often unexpected understanding or realization of a problem's solution. It involves a shift in thinking that allows individuals to see connections between previously unrelated pieces of information.
Mental set: Mental set is a tendency to approach problems in a specific way based on previous experiences and knowledge. It can either facilitate problem-solving by providing effective strategies or hinder it by limiting flexibility and creativity.