{"pk":21401,"title":"Effects of Discrimination Difficulty on Peak Shift and Generalization","subtitle":null,"abstract":"In this paper, we test the effect of manipulating discrimination difficulty on subsequent generalization of learning and in particular, on the peak shift effect. Participants learned a discrimination where one stimulus led to an outcome (S+) and another stimulus led to no outcome (S-). Difficulty was manipulated by varying the degree of similarity between the S+ and S- across groups (easy/medium/hard). In contrast to similar studies in animals, we found that increasing the difficulty of the discrimination resulted in less peak shift. Using a hierarchical mixture model, we characterize the effects of discrimination difficulty on relational- and similarity based responding, and show for the first time, a similar mixture of responding on stimulus identification gradients. We conclude that peak shift on generalization and identification measures can be explained by mixtures of participants responding in different ways.","language":"eng","license":{"name":"","short_name":"","text":null,"url":""},"keywords":[{"word":"Psychology; Animal cognition; Learning; Perception; Mathematical modeling"}],"section":"Papers with Oral Presentation","is_remote":true,"remote_url":"https://escholarship.org/uc/item/4br7d85x","frozenauthors":[{"first_name":"Jessica","middle_name":"C.","last_name":"Lee","name_suffix":"","institution":"University of Sydney","department":""},{"first_name":"Tamara","middle_name":"","last_name":"Cahyadi","name_suffix":"","institution":"Macquarie University","department":""},{"first_name":"Peter","middle_name":"","last_name":"Lovibond","name_suffix":"","institution":"University of New South Wales","department":""},{"first_name":"René","middle_name":"","last_name":"Schlegelmilch","name_suffix":"","institution":"University of Bremen","department":""}],"date_submitted":null,"date_accepted":null,"date_published":"2024-01-01T18:00:00Z","render_galley":null,"galleys":[{"label":"PDF","type":"pdf","path":"https://journalpub.escholarship.org/cognitivesciencesociety/article/21401/galley/11000/download/"},{"label":"PDF","type":"pdf","path":"https://journalpub.escholarship.org/cognitivesciencesociety/article/21401/galley/21846/download/"}]}