Measurements of screen exposure at 12-months were based on caregiver responses to the question: "Does your child watch TV and/or DVDs? (yes/no)," and at 18- and 24- months based on the question: "Over the past 30 days, on average, how many hours per day did your child watch TV and/or DVDs?" Scores were considered "typical" if they were within one standard deviation from the average of the ITSP norm. Children score in "typical," "high" or "low" groups based on how often they display various sensory-related behaviors. ITSP subscales examine children's patterns of low registration, sensation seeking, such as excessively touching or smelling objects sensory sensitivity, such as being overly upset or irritated by lights and noise and sensation avoiding - actively trying to control their environment to avoid things like having their teeth brushed. Sensory processing outcomes were assessed at 33 months using the Infant/Toddler Sensory Profile (ITSP), a questionnaire completed by parents/caregivers, designed to give insights on how children process what they see, hear and smell, etc. The team pulled 2011-2014 data on television or DVD-watching by babies and toddlers at 12- 18- and 24-months from the National Children's Study of 1,471 children (50% male) nationwide. Sensory processing skills reflect the body's ability to respond efficiently and appropriately to information and stimuli received by its sensory systems, such as what the toddler hears, sees, touches, and tastes. According to the researchers, children exposed to greater TV viewing by their second birthday were more likely to develop atypical sensory processing behaviors, such as "sensation seeking" and "sensation avoiding," as well as "low registration" - being less sensitive or slower to respond to stimuli, such as their name being called, by 33 months old.
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