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Rats were trained under concurrent fixed\u2010ratio mixed\u2010ratio schedules, in which both ratio schedules were simultaneously available, and under a concurrent\u2010chains schedule, in which access to one of the mutually exclusive ratio schedules comprising the terminal links was contingent on a single \u201cchoice\u201d response. The distribution of responses between the two ratio schedules was taken as the choice proportion under the concurrent procedure, and the distribution of \u201cchoice\u201d responses was taken as the choice proportion under the concurrent\u2010chains procedure. Seven of eight rats displayed systematic choice; of those, each displayed nearly exclusive choice for fixed\u2010ratio 35 to the mixed\u2010ratio schedule under the concurrent procedure, but each displayed nearly exclusive choice for the mixed\u2010ratio schedule to fixed\u2010ratio 35 under the concurrent\u2010chains procedure. Thus, preference for a fixed or a mixed schedule of reinforcement depended on the procedure used to assess preference.<\/jats:p>","DOI":"10.1901\/jeab.1983.40-225","type":"journal-article","created":{"date-parts":[[2006,3,3]],"date-time":"2006-03-03T17:16:29Z","timestamp":1141406189000},"page":"225-237","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["CHOICE FOR APERIODIC VERSUS PERIODIC RATIO SCHEDULES: A COMPARISON OF CONCURRENT AND CONCURRENT\u2010CHAINS PROCEDURES"],"prefix":"10.1002","volume":"40","author":[{"given":"David P.","family":"Rider","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,2,26]]},"reference":[{"key":"e_1_2_1_1_2_2","volume-title":"The strength of conditioned reinforcers as a function of frequency and probability of reinforcement","author":"Autor S. 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