I wondered if maybe it was also an attempt to add some touches of weirdness to the memories. Beverly's recollections do have an attempt at 'horror' about them (the dead body, the screams, the long walk down the creepy corridor etc) and his disfigured face partly adds to that effect.
But, yeah - I still go with medical application.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist