Another important upshot of the high test–retest reliability of ISV metrics observed in the more successful tasks of the present study is that it provides further evidence that ISV shows trait-like characteristics. This is important for the idea of ISV as a suitable topic for differential psychology, but also as a possible endophenotype for psychiatric disorders – a key topic in ISV research. These data also suggest that ISV is a relatively stable trait in healthy participants, rather than only being a feature of pathological states such as psychosis or terminal decline.