Absorption is most commonly measured by the Tellegen Absorption Scale. Several versions of this scale are available, the most recent being by Graham Jamieson, who provides a copy of his modified scale. The TAS comprises nine content clusters or subscales:
A 1991 study by Glisky et al. concluded that responsiveness to the engaging or inductive stimuli subscales of the TAS were more strongly related to hypnotisability than were imagistic thought, episodes of expanded awareness, or absorption in thoughts and imaginings. A revised version of the TAS has been included in Tellegen's Multidimensional Personality Questionnaire in which it is considered both a primary and a broad trait. In the MPQ, absorption has two subscales called "sentient" and "prone to imaginative and altered states" respectively. Tellegen has assigned copyright of TAS to the University of Minnesota Press. It was generally believed from the 1990s that the TAS was now in the public domain, and various improved versions were circulated. However, recently the UMP has reasserted its copyright, and regards these later versions to be unauthorised, and also disputes whether these versions are in fact improvements.
Absorption can facilitate the experience of both positive and negative emotions. Positive experiences facilitated by absorption include the enjoyment of music, art, and natural beauty and pleasant forms of daydreaming. Absorption has also been linked to forms of maladjustment, such as nightmare frequency and anxiety sensitivity, and dissociative symptoms. Absorption may act to amplify minor somatic symptoms, leading to an increased risk of conditions associated with hypersensitivity to internal bodily sensations, such as somatoform disorders and panic disorder. People may have a particular risk of the aforementioned problems when they are prone to both high absorption and to personality traits associated with negative emotionality.
A core feature of absorption is an experience of focused attention wherein: "objects of absorbed attention acquire an importance and intimacy that are normally reserved for the self and may, therefore, acquire a temporary self-like quality. These object identifications have mystical overtones." This capacity for focused attention facilitates the experience of altered states of consciousness. In addition to individual differences in hypnotizability, absorption is associated with differential responses to other procedures for inducing altered states of consciousness, including meditation, marijuana use, and biofeedback. A review of studies on differential response to the drug psilocybin found that absorption had the largest effect of all the psychological variables assessed on the intensity of individual experiences of altered states of consciousness. Absorption was strongly associated with overall consciousness alteration and with mystical-type experiences and visual effects induced by psilocybin. Researchers have suggested that individual differences in both absorption and responsiveness to hallucinogenic drugs could be related to the binding potential of serotonin receptors which are the main site of action of classic hallucinogens, such as LSD and psilocybin.
Dream recall
Research has found that frequency of dream recall is associated with absorption and related personality traits, such as openness to experience and proneness to dissociation. A proposed explanation is the continuity model of human consciousness. This model proposes that people who are prone to vivid and unusual experiences during the day, such as fantasy and daydreaming, will tend to have vivid and memorable dream content, and hence will be more likely to remember their dreams.
