Used results of a study of 5 month olds and a study of 5-11 month olds to differentiate subtypes of infant mouthing. Only certain types of mouthing constituted exploratory activity. The process of mouthing an object then looking at it can be designated as exploratory mouthing. (BG)

Investigated newborns' responses to decreased sound pressure level (SPL) by means of a localized head turning habituation procedure. Findings, which demonstrated recovery of neonatal head turning to decreased SPL, were inconsistent with the selective receptor adaptation model. (RH)

Assessed delayed-response performance in 120 infants 7, 9, and 11 months old. Correct response was identified as either retrieval of a hidden object or a gaze toward its location. Performance improved with age, was above chance for each age group in each condition, and was more often correct for gaze response, suggesting a significant effect of…

The Infant Temperament Questionnaire was used to assess behavioral peculiarities of 30 infants born with low birth weight (LBW), compared to two control infants of normal birth weight assigned to each LBW case. LBW was significantly associated with infant's adaptability, with LBW infants presented as slower adapting. This behavioral feature was…

Maintains author's interpretation of 6-month-olds' behavior is consistent with task requirements in the 2000 study and previous work showing that infants use explanatory inferences to make sense of their world. Asserts that ability to understand that people communicate with persons but act on objects is precursor to infants' understanding at 9 to…

Behavioral responses of 3- to 4-day-old newborns to the odors of various human milk (HM) and formula milk (FM) were examined in paired-choice tests. When both stimuli were nonfamiliar, breast-fed, as well as bottle-fed, infants oriented their head and mouthed more vigorously to HM than to FM. When breast-fed infants were exposed to nonfamiliar HM…

Little is known about the acoustic cues infants might use to selectively attend to one talker in the presence of background noise. This study examined the role of talker familiarity as a possible cue. Infants either heard their own mothers (maternal-voice condition) or a different infant's mother (novel-voice condition) repeating isolated words…

Although a large literature discusses infants' preference for infant-directed speech (IDS), few studies have examined how this preference might change over time or across listening situations. The work reported here compares infants' preference for IDS while listening in a quiet versus a noisy environment, and across 3 points in development: 4.5…

In 4 experiments, we examined 16- and 20-month-old infants' understanding of proper names and count nouns. In each experiment, infants were taught a novel word modeled linguistically as either a proper name (e.g., "DAXY") or a count noun (e.g., "a DAXY") for a stuffed animal shown on a puppet stage. This animal was moved to a new location on the…

To elucidate the differential saliency of infant emotions to mothers across interactive contexts, the authors examined the moderating role of observed infant affect during interactions with mother in the relation between maternal and laboratory-based ratings of infant temperament. Fifty-nine developmentally healthy 9-month-old infants were…

To better understand the form and recognizability of neonatal smiling, 32 newborns (14 girls; M = 25.6 hr) were videorecorded in the behavioral states of alertness, drowsiness, active sleep, and quiet sleep. Baby Facial Action Coding System coding of both lip corner raising (simple or non-Duchenne) and lip corner raising with cheek raising…

A parent-report instrument, the First Year Inventory (FYI), was developed to assess behaviors in 12-month-old infants that suggest risk for an eventual diagnosis of autism. The target behaviors were identified from retrospective and prospective studies. FYIs were mailed to 5,941 families and 25% (N = 1,496) were returned, with higher return rates…

This article presents the causes of anger and frustrations of children at different ages. Honig discusses understanding children's anger from ages 0-2 and gives suggestions on how to cope with anger. Miller discusses how children ages 3-4 provoke to anger, and recommends ways to prevent it. Church discusses the cause of anger in 5- and 6-year old…

Studied infants' reactions to a Plexiglas box placed over a toy by their mothers. (JMB)