A 1995 study by Adolf Dittrich and Daniel Lamparter found that DMT-induced altered state of consciousness (ASC) is strongly influenced by habitual rather than situative factors. In the study, researchers used three dimensions of the APZ questionnaire to examine ASC. The first dimension, oceanic boundlessness (OB), refers to dissolution of ego boundaries and is mostly associated with positive emotions. The second dimension, anxious ego-dissolution (AED), represents a disordering of thoughts and decreases in autonomy and self-control. Lastly, visionary restructuralization (VR) refers to auditory/ visual illusions and hallucinations. Results showed strong effects within the first and third dimensions for all conditions, especially with DMT, and suggested strong intrastability of elicited reactions independently of the condition for the OB and VR scales.