Graphology the relationship. The theory is that after knowing and understanding how each individual in the relationship differs from every other individual in the relationship, the resulting marriage will be more enduring. Medical graphology is probably the most controversial branch of handwriting analysis. Strictly speaking, such research is not graphology as described throughout this article but an examination of factors pertaining to motor control. Research studies have been conducted in which a detailed examination of handwriting factors, particularly timing, fluidity, pressure, and consistency of size, form, speed, and pressure are considered in the process of evaluating patients and their response to
What Love Is Made Of extremely positive about "What Love Is Made Of", describing it as "darker than anything" from "On a Mission", while calling it "slinky". The reviewer went on to commend the "irresistibly pouty" chorus. Pitchfork Media's Katherine St. Asaph commented that, in the song, the singer "sound[ed] completely enthralled, by either her lover or the music" and complimented her voice, noting that it seemed "ten times bigger than before". Jordan Sargent of "Spin" magazine called the track "exuberant" and highlighted Katy's vocal performance, which he deemed "typically fantastic", while the team from pop music website Popjustice gave "What Love Is Made Of"