JFC. This thing is a monkey nightmare machine.

https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hire...

For sure, those are very likely images of fear. If you wanna call them “highly stimulating” well... That’s probably not untrue.

But the only thing that the monkey is likely finding “stimulating” about familiar people in surgical masks is an association with pain and terror. Note the odd expressionless faces standing over them, holding utensils.

Pretty god damned ominous. Not at all images one might call fun.