With no fixations on the number of stars or on the title of the review, the only two possibilities I can think of are the recency effect and a keyword the user

With no fixations on the number of stars or on the title of the review, the only two possibilities I can think of are the recency effect and a keyword the user was looking for. But if the user looked at but didn't fixate on stars/title (or other elements) we have only intuition to go on.