{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T18:48:43Z","timestamp":1766170123710,"version":"3.48.0"},"reference-count":56,"publisher":"Public Library of Science (PLoS)","issue":"12","license":[{"start":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T00:00:00Z","timestamp":1766102400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001821","name":"Vienna Science and Technology Fund","doi-asserted-by":"publisher","award":["Project CS 18-023"],"award-info":[{"award-number":["Project CS 18-023"]}],"id":[{"id":"10.13039\/501100001821","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002428","name":"Austrian Science Fund","doi-asserted-by":"publisher","award":["Y 1309"],"award-info":[{"award-number":["Y 1309"]}],"id":[{"id":"10.13039\/501100002428","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002428","name":"Austrian Science Fund","doi-asserted-by":"publisher","award":["PAT2728324"],"award-info":[{"award-number":["PAT2728324"]}],"id":[{"id":"10.13039\/501100002428","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS One"],"abstract":"<jats:p>Discrimination learning tasks are a method for investigating species\u2019 perception of and associative learning with a particular stimulus. Goffin\u2019s cockatoos previously required surprisingly few trials to differentiate objects based on weight alone in a simple discrimination task, outperforming primates in other weight discrimination setups. Nevertheless, it was unclear whether the difference in performance was largely based on ability or differences in experimental procedures. Therefore, we tested a group of Goffin\u2019s cockatoos on a weight-based conditional discrimination, like a task previously used with chimpanzees. Similar to the chimpanzees (compared to their first 15 sessions), none of our subjects reached above-chance levels of performance in the present study. The contrasting performance of our cockatoos in the two weight discrimination studies are in line with the idea that conditional discriminations are more cognitively demanding than simple discriminations. Our results do not support the notion of a distinct difference between birds and primates in their arbitrary discrimination learning abilities with weight cues. However, further research on this question (we suggest with simple discrimination formats) would be necessary.<\/jats:p>","DOI":"10.1371\/journal.pone.0338604","type":"journal-article","created":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T18:44:27Z","timestamp":1766169867000},"page":"e0338604","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Testing weight-based conditional discrimination in Goffin\u2019s cockatoos, Cacatua goffiniana"],"prefix":"10.1371","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0573-7891","authenticated-orcid":true,"given":"Poppy J.","family":"Lambert","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Antonia","family":"Rippel-Rachle","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alice M. 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tension in the size-weight illusion","volume":"22","author":"CM Davis","year":"1977","journal-title":"Percept Psychophys"},{"key":"pone.0338604.ref041","volume-title":"The sense of touch (Ross HE, Murray DJ trans.)","author":"EH Weber","year":"1834"},{"key":"pone.0338604.ref042","first-page":"64","volume-title":"A theory of Pavlovian conditioning: Variations in the effectiveness of reinforcement and nonreinforcement. In A. H. Black & W. F. Prokasy (Eds.), Classical conditioning II","author":"RA Rescorla","year":"1972"},{"issue":"3","key":"pone.0338604.ref043","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1037\/0735-7036.116.3.277","article-title":"Imitation of conditional discriminations in pigeons (Columba livia)","volume":"116","author":"BR Dorrance","year":"2002","journal-title":"J Comp Psychol"},{"key":"pone.0338604.ref044","volume-title":"R: A Language and Environment for Statistical Computing","author":"R Core Team","year":"2024"},{"key":"pone.0338604.ref045","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1016\/j.jml.2017.01.001","article-title":"Balancing Type I error and power in linear mixed models","volume":"94","author":"H Matuschek","year":"2017","journal-title":"J Memory Lang"},{"key":"pone.0338604.ref046","doi-asserted-by":"crossref","first-page":"7569","DOI":"10.1038\/srep07569","article-title":"Stimulus similarity determines the prevalence of behavioral laterality in a visual discrimination task for mice","volume":"4","author":"M Trevi\u00f1o","year":"2014","journal-title":"Sci Rep"},{"key":"pone.0338604.ref047","doi-asserted-by":"crossref","first-page":"99","DOI":"10.3389\/fnbeh.2020.00099","article-title":"Adaptive Choice Biases in Mice and Humans","volume":"14","author":"M Trevi\u00f1o","year":"2020","journal-title":"Front Behav Neurosci"},{"issue":"5","key":"pone.0338604.ref048","doi-asserted-by":"crossref","first-page":"675","DOI":"10.1016\/S1350-9462(01)00009-X","article-title":"The visual ecology of avian photoreceptors","volume":"20","author":"NS Hart","year":"2001","journal-title":"Prog Retin Eye Res"},{"key":"pone.0338604.ref049","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1037\/h0045047","article-title":"The effect of stimulus comparison on discrimination learning and transposition","volume":"53","author":"DA Riley","year":"1960","journal-title":"J Comp Physiol Psychol"},{"issue":"4","key":"pone.0338604.ref050","doi-asserted-by":"crossref","first-page":"971","DOI":"10.3758\/s13414-010-0073-7","article-title":"Crossmodal correspondences: a tutorial review","volume":"73","author":"C Spence","year":"2011","journal-title":"Atten Percept Psychophys"},{"key":"pone.0338604.ref051","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1146\/annurev.psych.52.1.111","article-title":"Theories of associative learning in animals","volume":"52","author":"JM Pearce","year":"2001","journal-title":"Annu Rev Psychol"},{"issue":"8","key":"pone.0338604.ref052","doi-asserted-by":"crossref","first-page":"437","DOI":"10.1016\/j.tics.2012.06.010","article-title":"Top-down versus bottom-up attentional control: a failed theoretical dichotomy","volume":"16","author":"E Awh","year":"2012","journal-title":"Trends Cogn Sci"},{"issue":"1","key":"pone.0338604.ref053","doi-asserted-by":"crossref","first-page":"8681","DOI":"10.1038\/s41598-020-65223-6","article-title":"Using an Innovation Arena to compare wild-caught and laboratory Goffin\u2019s cockatoos","volume":"10","author":"T R\u00f6ssler","year":"2020","journal-title":"Sci Rep"},{"issue":"2","key":"pone.0338604.ref054","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1016\/j.bbr.2007.06.017","article-title":"Do discrimination tasks discourage multi-dimensional stimulus processing? 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