It is need which gives pleasure.

In behavioral neuropharmacology, this refers to a shift in the 'pursuit of pleasure.' Stimulation of cannabinoid receptors, for example, can cause a hedonic shift in food consumption.

The Hedonic scale is a rating system used for little kids to get a better understanding of what their opinion is. it is usually a selection of different 'happy faces' or a system of stars out of five.

of, pertaining to, or determined by regression analysis: regression curve; regression equation. dictionary.com

Unit regression testing Regional regression testing Full regression testing