Infants’ gaze exhibits a fractal structure that varies by age and stimulus salience

Isabella C. Stallworthy, Robin Sifre, Daniel Berry, Carolyn Lasch, Tim J. Smith, Jed T. Elison

Research output: Contribution to journalArticlepeer-review

Abstract

The development of selective visual attention is critical for effectively engaging with an ever-changing world. Its optimal deployment depends upon interactions between neural, motor, and sensory systems across multiple timescales and neurocognitive loci. Previous work illustrates the spatio-temporal dynamics of these processes in adults, but less is known about this emergent phenomenon early in life. Using data (n = 190; 421 visits) collected between 3 and 35 months of age, we examined the spatio-temporal complexity of young children’s gaze patterns as they viewed stimuli varying in semantic salience. Specifically, we used detrended fluctuation analysis (DFA) to quantify the extent to which infants’ gaze patterns exhibited scale invariant patterns of nested variability, an organizational feature thought to reflect self-organized and optimally flexible system dynamics that are not overly rigid or random. Results indicated that gaze patterns of even the youngest infants exhibited fractal organization that increased with age. Further, fractal organization was greater when children (a) viewed social stimuli compared to stimuli with degraded social information and (b) when they spontaneously gazed at faces. These findings suggest that selective attention is well-organized in infancy, particularly toward social information, and indicate noteworthy growth in these processes across the first years of life.

Original languageEnglish (US)
Article number17216
JournalScientific reports
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2020

Bibliographical note

Funding Information:
This study was supported by a NIMH sponsored Biobehavioral Award for Innovative New Scientists (R01 MH104324) to J. Elison, and in part by the UNC/UMN Baby Connectome Project (U01MH110274). I. Stall-worthy, R. Sifre, and C. Lasch are funded by the National Science Foundation Graduate Research Fellowships Program (NSF-GRFP). The funders had no role in study design, analysis, data interpretation, or the writing of the report. We thank all the children and families who participated in our studies. Lastly, we are indebted to the ELAB members for their dedication to the broader project, specifically Kirsten Dalrymple, Elayne Teska, Rachel Roisum, and Kristen Gault.

Funding Information:
D.B. and J.E. conceptualized the project. J.E., D.B, I.S., and R.S. contributed to developing methodology. Programming and formal analysis were conducted by I.S. and R.S. Investigation for this project was carried out by J.E. and C.L. Writing was carried out by I.S. and R.S. and all authors contributed to revisions. J.E. and T.S. provided the resources for this project and the project was supervised by J.E. and D.B. Funding for the project was acquired by J.E.

PubMed: MeSH publication types

  • Journal Article
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, N.I.H., Extramural

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