![]() The difficulty is that B is difficult to define. Unfortunately this equation is only useful in demonstrating relationships. P(H) is the probability of an auditory hallucinationī is the strength of the contexualising stimulus In some cases however, these causes relate to hearing impairment. There will be no explanation for all cases of auditory hallucinations as they are symptoms with a heterogenous collection of causes. If we can characterise the McGurk Effect and the Manley Words as auditory ambigrams contextualised by visual stimuli then we can look at auditory hallucinations from another perspective. The sounds in the videos above are effectively auditory ambigrams and the perspective is contextualised by the presented visual information. To hear the same sound as pine, magpie and bagpipe as simple examples suggests that these effects are quite powerful.Īmbigrams are symbols that manifest a different meaning when viewed from another perspective. ![]() In both cases, if you are expecting something from a visual cue then this can influence your perception of sounds. These illusions are quite impressive and have some similarities to the McGurk Effect examined in a previous post. I will refer to the effect eponymously as the Manley Words. I was able to hear these words convincingly for the first few words although it was a little less convincing for later words. When different words are presented on the screen the spoken words take on the appearance of the written words. Although the sounds are rather ominous, working through the video the most remarkable segment contains the words ‘high’ and ‘low’. The reader may recognise the initial Shepard tones from a previous post. The video above from Kyle Manley’s channel illustrates a range of auditory illusions.
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