 Skeptic Michael Shermer claims that the emergence of the " Paul is dead " phenomenon , including the alleged message at the end of " I 'm So Tired " , was caused by faulty perception of a pattern . Shermer argues that the human brain evolved with a strong pattern recognition ability that was necessary to process the large amount of noise in man 's environment , but that today this ability leads to false positives . Stanford University psychology professor Brian Wandell postulates that the observance of backward messages is a mistake arising from this pattern recognition facility , and argues that subliminal persuasion theories are " bizarre " and " implausible . " Rumors of backmasking in popular music have been described as auditory pareidolia . James Walker , president of Christian research group Watchman Fellowship , states that " You could take a Christian hymn , and if you played it backwards long enough at different speeds , you could make that hymn say anything you want to " ; Led Zeppelin publicist BP Fallon concurs , saying " Play anything backwards , and you 'll find something . " Eric Borgos of audio reversal website talkbackwards.com states that " Mathematically , if you listen long enough , eventually you 'll find a pattern " , while Jeff Milner recounts , " Most people , when I show them the site , say that they 're not able to hear anything , until , of course , I show them the reverse lyrics . " 
