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Re:Google Home: An Insight Into a 4-Year-Old’s Mind by pavel_lishin on Friday May 19, 2017 @03:35PM (#14378753)
> Under the covers, it's like an old "choose your own adventure" game, assembling a narrative out of parts. And it uses eye tracking to detect what you're interested in. Do you like character A? Then we'll emphasize A.

Hannu Rajaniemi (science fiction author) tried to go further, and attempted to create an "interactive" narrative that actually used some brain activity sensors to see what imagery you most responded to: http://neurofiction.net/

Re:Google Home: An Insight Into a 4-Year-Old’s Mind by mncharity on Friday May 19, 2017 @04:37PM (#14379142)
> what imagery you most responded to

Apr 1, 2020 - Scary Zombie Game introduced "scared as you want to be"(tm), using real-time emotive feedback to adjust game art and story to achieve the desired levels, types, and temporal profiles of scare. The "won't startle a baby bunny" profile developed a camp cult following. Valve reports no player has ever completed the "continuously mounting dread with Poisson spikes of terror" profile.

With eye tracking perhaps widespread in the 2018 generation of HMDs, it seems an area likely to get increasing attention.