A new study co-led by Indiana University that tracked the eye movement of twins finds that genetics plays a strong role in how people attend to their environment.
[R]esearchers compared the eye movements of 466 children — 233 pairs of twins (119 identical and 114 fraternal) — between ages 9 and 14 as each child looked at 80 snapshots of scenes people might encounter in daily life, half of which included people. Using an eye tracker, the researchers then measured the sequence of eye movements in both space and time as each child looked at the scene. They also examined general “tendencies of exploration”; for example, if a child looked at only one or two features of a scene or at many different ones.
Published [November 11] in the journal Current Biology, the study found a strong similarity in gaze patterns within sets of identical twins, who tended to look at the same features of a scene in the same order. It found a weaker but still pronounced similarity between fraternal twins.
“This is not a subtle statistical finding,” [researcher Daniel] Kennedy said. “How people look at images is diagnostic of their genetics. Eye movements allow individuals to obtain specific information from a space that is vast and largely unconstrained. It’s through this selection process that we end up shaping our visual experiences.
[Editor’s note: Read the full study (behind paywall)]
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