Blinks mark thought

Glassy, unblinking eyes give a generated face away first. A blink placed where a thought turns does more than any adjective.

The eye-life line [proven], one per character whose eyes read, inside PERFORMANCE:

• the eyes stay locked on what they look at (where that is comes from the EYELINE line);

• the pupils move;

• a blink lands where a thought finishes or changes direction; between those, the blinks come irregularly;

• a controlled, powerful or deceiving character blinks rarely and slowly;

• a listener's blink may follow the speaker's blink at a pause by about 0.25–0.5 s [best available, not yet validated].

Judge eyes and blinks on the 1080p finish at full size, never on a 480p draft. A blink that lands a little early is harmless; frozen eyes are not, so keep the moving pupils in every line.

Why: Walter Murch treats a blink as the punctuation of a thought, and edits on it. A 2010 study found that listeners blink about a quarter to half a second after a speaker's blink at a pause. A critic who saw a full AI feature at Cannes in 2026 named the eyes as the biggest giveaway.

Sources

• Walter Murch, In the Blink of an Eye (No Film School); Nakano and Kitazawa, "Eyeblink entrainment at breakpoints of speech" (study); Michael Caine; Higgsfield's The Cully Hill Boys (controlled characters blink rarely); JoBlo's review of Hell Grind (review).