Experimental Factor Ontology id EFO_0009097 (positive domain measurement) is a measurement of some aspect of psychological positive valence systems e.g. those responsible for responses to positive motivational situations or contexts, such as reward seeking, consummatory behavior, and reward/habit learning.  Based on the NIH NIMH's research domain criteria (RDoC).  https://www.nimh.nih.gov/research-priorities/rdoc/definitions-of-the-rdoc-domains-and-constructs.shtml.