Relationship between eye movement, learning, and picture complexity

@article{Nesbit1981RelationshipBE,
  title={Relationship between eye movement, learning, and picture complexity},
  author={Larry L. Nesbit},
  journal={ECTJ},
  year={1981},
  volume={29},
  pages={109-116}
}
Is the number of eye fixations a reliable external indicator of internal cognitive processes when subjects are unaware that their eye movements are being monitored electronically? In this study involving college students, there was a relationship between posttest scores and the number of eye fixations, and intelligence level of the subject was correlated with eye fixations.