Portugal Ana Maria, Taylor Mark J, Tammimies Kristiina, Ronald Angelica, Falck-Ytter Terje
Development and Neurodiversity Lab (DIVE), Department of Psychology, Uppsala University, Uppsala, Sweden.
Center of Neurodevelopmental Disorders (KIND), Centre for Psychiatry Research, Department of Women's and Children's Health, Karolinska Institutet and Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Sci Rep. 2025 Feb 3;15(1):4100. doi: 10.1038/s41598-024-83557-3.
Eye-movement metrics like fixation location and duration are increasingly being used in infancy research. We tested whether fixation durations during meaningful social stimulus viewing involve common or different familial influences than fixation durations during viewing of abstract stimulus. We analysed the duration of fixations, and the allocation of fixations to face and motion, from 536 dizygotic and monozygotic 5-month-old twins in: naturalistic scenes including low- and high-level social features, and abstract scenes only having low-level features. We observed significant genetic influences in both conditions (h = 0.30, 95% confidence interval (CI) 0.14 to 0.44; h = 0.25, 95% CI 0.09 to 0.39), while shared environmental influences were negligible. Although some genetic influences were shared between the two conditions, unique genetic factors were linked to naturalistic scene viewing, indicating that fixation durations index different phenomena dependent on the context. Heritability for face looking was moderate (h = 0.19, 95% CI 0.03 to 0.34), and no familial influences were found for motion looking. Exploratory polygenic score analyses revealed no significant associations with fixation measures. This study underscores the dissociable genetic influences on infants' visual exploration of abstract versus naturalistic stimuli and the importance of considering context when interpreting eye-tracking data.
像注视位置和持续时间这样的眼动指标越来越多地被用于婴儿研究中。我们测试了在观看有意义的社会刺激时的注视持续时间与观看抽象刺激时的注视持续时间相比，是否涉及相同或不同的家族影响。我们分析了536对5个月大的异卵和同卵双胞胎在以下场景中的注视持续时间，以及注视在面部和动作上的分配情况：包含低层次和高层次社会特征的自然场景，以及仅具有低层次特征的抽象场景。我们在两种情况下都观察到了显著的遗传影响（h = 0.30，95%置信区间（CI）为0.14至0.44；h = 0.25，95%CI为0.09至0.39），而共同环境影响可以忽略不计。虽然两种情况之间存在一些共同的遗传影响，但独特的遗传因素与自然场景观看有关，这表明注视持续时间指标所反映的现象因情境而异。对面部注视的遗传度适中（h = 0.19，95%CI为0.03至0.34），未发现对动作注视有家族影响。探索性多基因评分分析显示与注视指标无显著关联。这项研究强调了对婴儿抽象刺激与自然刺激视觉探索的可分离遗传影响，以及在解释眼动追踪数据时考虑情境的重要性。
