[Speech illusions and their significance for aviation and space flight practice]

The pattern of erroneous perception of intelligible and incoherent words accompanied by loud noise has been investigated. It has been found that proper interpretation of incoherent words depends at large on their rhythmic, or syllabic structure. As a rule, the words are reconstructed in the back-to-forward direction. One- and two-syllable words with predominant median and low frequencies are those which are most frequently subjected to speech illusions.