some questions on IQ tests depict rotated images of figures, and ask things like:<p>&gt; can the two figures in each set be made identical by rotating them in space? [0]<p>this isn&#x27;t my domain, so without knowing any better i would kind of expect the Vividness of Visual Imagery Questionnaire and its abridged version to ask similar questions. but if they didn&#x27;t, and you wanted to create another test, here&#x27;s where i&#x27;d start:<p>1. devise a test with a bunch of similar questions (to the one in the above example) of varying difficulty. use these hypotheses:<p>H_{0}: there will be no difference in performance for people with aphantasia<p>H_{1}: people with aphantasia will perform worse.<p>2. find some people with aphantasia and test them to get a baseline.<p>3. test a random sample.<p>4. compare results. maybe use a one-tailed test.<p>[0] link to image: <a href="https:&#x2F;&#x2F;saylordotorg.github.io&#x2F;text_introduction-to-psychology&#x2F;section_13&#x2F;7b058245d52f3821cd0727530bc761a1.jpg" rel="nofollow">https:&#x2F;&#x2F;saylordotorg.github.io&#x2F;text_introduction-to-psycholo...</a>