Delusion

A delusion is a belief held with strong conviction despite superior evidence to the contrary. As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, or other effects of perception.

Delusions typically occur in the context of neurological or mental illness, although they are not tied to any particular disease and have been found to occur in the context of many pathological states (both physical and mental). However, they are of particular diagnostic importance in psychotic disorders including schizophrenia, paraphrenia, manic episodes of bipolar disorder, and psychotic depression.

Definition

Although non-specific concepts of madness have been around for several thousand years, the psychiatrist and philosopher Karl Jaspers was the first to define the three main criteria for a belief to be considered delusional in his 1913 book General Psychopathology. These criteria are:

Pink Floyd bootleg recordings

Pink Floyd bootleg recordings are the collections of audio and video recordings of musical performances by the British rock band Pink Floyd, which were never officially released by the band. The recordings consist of both live performances and outtakes from studio sessions unavailable in official releases. In some cases, certain bootleg recordings may be highly prized among collectors, as at least 40 songs composed by Pink Floyd have never been officially released.

During the 1970s, bands such as Pink Floyd created a lucrative market for the mass production of unofficial recordings with large followings of fans willing to purchase them. In addition, the huge crowds that turned up to these concerts made the effective policing of the audience for the presence of recording equipment virtually impossible. Vast numbers of recordings were issued for profit by bootleg labels.

Some Pink Floyd bootlegs exist in several variations with differing sound quality and length because sometimes listeners have recorded different versions of the same performance at the same time. Pink Floyd was a group that protected its sonic performance, making recording with amateur recording devices difficult. In their career, Pink Floyd played over 1,300 concerts, of which more than 350 were released as bootlegged recordings (sometimes in various versions). Few concerts have ever been broadcast (or repeated once they were broadcast on television), especially during 'the golden age' of the group from 1966 to 1981.