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To this end, a therapeutic invigoration task was developed drawing on cognitive\u2010behavioral and guided imagery therapies. This study investigated the validity and reliability of a therapeutic invigoration task in avolitional residual phase schizophrenia outpatients.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In a proof\u2010of\u2010concept quasi\u2010experimental one\u2010group sequentially repeated pretest\/posttest study design, patients (<jats:italic>n<\/jats:italic>\u2009=\u200976) participated in a structured invigoration task that was repeated after 1 month (<jats:italic>n<\/jats:italic>\u2009=\u200970).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Patients' vigor during the preceding 7 days measured on the Vigor Assessment Scale increased highly significantly in anticipation of the subsequent 7 days on both occasions with respectively very large (Cohen's <jats:italic>\u03b4<\/jats:italic> with Hedges' correction [<jats:italic>\u03b4<\/jats:italic>]\u2009=\u20091.46) and large (<jats:italic>\u03b4<\/jats:italic>\u2009=\u20091.04) effect sizes. The anticipated vigor after the first occasion was partially consummated during the subsequent month in that vigor during the 7 days preceding the second occasion was lower than participants had anticipated but still significantly higher than at baseline (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001; <jats:italic>\u03b4<\/jats:italic>\u2009=\u20090.70). Repeating the task a month later, together with homework, had a cumulative effect as indicated by a very large effect size (<jats:italic>\u03b4<\/jats:italic>\u2009=\u20091.61).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Results suggest that the invigoration task did what it was supposed do, and did so consistently, in patients with avolitional residual schizophrenia. These results warrant a subsequent randomized controlled trial to establish the efficacy of the invigoration task.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jclp.23562","type":"journal-article","created":{"date-parts":[[2023,6,27]],"date-time":"2023-06-27T13:44:26Z","timestamp":1687873466000},"page":"7-22","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The validity of a therapeutic invigoration task in avolitional schizophrenia outpatients"],"prefix":"10.1002","volume":"80","author":[{"given":"Antonia","family":"Dlagnekova","sequence":"first","affiliation":[{"name":"Department of Psychiatry University of Pretoria Pretoria South Africa"},{"name":"Centre for Ethics and Philosophy of Health Sciences University of Pretoria  Pretoria South Africa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8411-5846","authenticated-orcid":false,"given":"Werdie","family":"Van 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