Intuitive probabilistic inference in capuchin monkeys

The ability to reason about probabilities has ecological relevance for many species. Recent research has shown that both preverbal infants and non-human great apes can make predictions about single-item samples randomly drawn from populations by reasoning about proportions. To further explore the evolutionary origins of this ability, we conducted the first investigation of probabilistic inference in a monkey species (capuchins; Sapajus spp.). Across four experiments, capuchins (N = 19) were presented with two populations of food items that differed in their relative distribution of preferred and non-preferred items, such that one population was more likely to yield a preferred item. In each trial, capuchins had to select between hidden single-item samples randomly drawn from each population. In Experiment 1 each population was homogeneous so reasoning about proportions was not required; Experiments 2–3 replicated previous probabilistic reasoning research with infants and apes; and Experiment 4 was a novel condition untested in other species, providing an important extension to previous work. Results revealed that at least some capuchins were able to make probabilistic inferences via reasoning about proportions as opposed to simpler quantity heuristics. Performance was relatively poor in Experiment 4, so the possibility remains that capuchins may use quantity-based heuristics in some situations, though further work is required to confirm this. Interestingly, performance was not at ceiling in Experiment 1, which did not involve reasoning about proportions, but did involve sampling. This suggests that the sampling task posed demands in addition to reasoning about proportions, possibly related to inhibitory control, working memory, and/or knowledge of object permanence.     

Integrating physical constraints in statistical inference by 11-month-old infants

Much research on cognitive development focuses either on early-emerging domain-specific knowledge or domain-general learning mechanisms. However, little research examines how these sources of knowledge interact. Previous research suggests that young infants can make inferences from samples to populations (Xu & Garcia, 2008) and 11- to 12.5-month-old infants can integrate psychological and physical knowledge in probabilistic reasoning (Teglas, Girotto, Gonzalez, & Bonatti, 2007; Xu & Denison, 2009). Here, we ask whether infants can integrate a physical constraint of immobility into a statistical inference mechanism. Results from three experiments suggest that, first, infants were able to use domain-specific knowledge to override statistical information, reasoning that sometimes a physical constraint is more informative than probabilistic information. Second, we provide the first evidence that infants are capable of applying domain-specific knowledge in probabilistic reasoning by using a physical constraint to exclude one set of objects while computing probabilities over the remaining sets.     

Child care centre adherence to infant physical activity and screen time recommendations in Australia,Canada and the United States: An observational study

ObjectiveThe aim of this study was to compare adherence to physical activity and sedentary behaviour recommendations within the 2011 Institute of Medicine Early Childhood Obesity Prevention Policies as well as screen time recommendations from the 2013 American Academy of Pediatrics for samples of infants in child care centres in Australia, Canada, and the United States (US).MethodsThis cross-sectional study used data from: the Australian 2013 Standing Preschools (N = 9) and the 2014–2017 Early Start Baseline (N = 22) studies; the 2011 Canadian Healthy Living Habits in Pre-School Children study (N = 14); and the American 2008 (N = 31) and 2013–2017 (N = 31) Baby Nutrition and Physical Activity Self-Assessment for Child Care (NAP SACC) trials. Data were compared on the above infant recommendations. Percentages were used to describe compliance to the recommendations and chi-square tests to determine whether compliance differed by country.ResultsChild care centres were most compliant (74%–95%) with recommendations to: provide daily indoor opportunities for infants to move freely under adult supervision, daily tummy time for infants less than 6 months of age, indoor and outdoor recreation areas that encourage infants to be physically active, and discourage screen time. Centres were least compliant (38%-41%) with adhering to recommendations to: limit the use of equipment that restricts an infant’s movement and provide education about physical activity to families. Compared with Canadian and US centres, Australian centres were less compliant (46%) with the recommendation to engage with infants on the ground each day, to optimize adult-infant interactions and to limit the use of equipment that restricts the infant’s movement. Canadian centres were less compliant (39%) with the recommendation to provide training to staff and education to parents about children’s physical activity. US centres were less compliant (25%–41%) with the recommendations to provide daily opportunities for infants to explore their outdoor environment, limit the use of equipment that restricts the infant’s movement and provide education to families about children’s physical activity.ConclusionsAssisting child care centres on limiting the use of equipment that restricts an infant’s movement, and providing education about children’s physical activity to families may be important targets for future interventions.     

Cognitive flexibility and response inhibition in patients with Obsessive-Compulsive Disorder and Generalized Anxiety Disorder

Background/ObjectiveThe main aim of this study was to analyze differences in inhibition and cognitive flexibility, taking into account some variables that may influence results (non verbal reasoning, depression, anxiety, intolerance of uncertainty, comorbidity, medication consumption).MethodThe participants were 95 adults aged 17-61 years old (M = 33.48, SD = 11.13), primary (most severe) Generalized Anxiety Disorder or Obsessive-Compulsive Disorder and a healthy control group. Neuropsychological neasures were completed using computerized Wisconsin Card Sorting Test, Stroop Color Word Test and Go/NoGo Task.ResultsClinical groups presented worse results in cognitive flexibility to the control group. The obsessive-compulsive group showed worse scores in flexibility than the generalized anxiety group, once non-verbal reasoning and tolerance to uncertainty were controlled. Comorbidity and medication use did not affect results in the obsessive compulsive group but did however influence the generalized anxiety group.ConclusionsCognitive flexibility could be included treatment in the treatment of obsessive-compulsive disorder and generalized anxiety disorder.     

Infant sleep-wake behaviors at two weeks,three and six months

Although infant sleep-wake behavior presents several developmental changes during the first six months, literature lacks on reference values and few studies have explored the role of individual change and stability on infant sleep-wake behavior during the first six months. This study aimed (1) to describe infant sleep-wake behaviors during the 24-h period, day and night, at two weeks, three, and six months, (2) and to explore developmental changes and the role of individual change and stability on infant sleep-wake behaviors from two weeks to six months. Ninety-four primiparous mothers completed measures on infant sleep-wake behaviors at two weeks, three and six months. Significant developmental changes were found on infant sleep-wake behaviors from two weeks to six months. Two-week-old infants sleep 13.3 h, spend 8.7 h awake, awake 6.1 times, have 0.4 h of latency to sleep, and 3.2 h of longest sleep period. Three-month-old infants sleep 13.0 h, spend 9.2 h awake, awake 5.5 times, have 0.4 h of latency to sleep, and 5.2 h of longest sleep period. Six-month-old infants sleep 12.2 h, spend 10.0 h awake, awake 5.2 times, have 0.4 h of latency to sleep, and 5.6 h of longest sleep period. Significant individual change and stability were also found on infant sleep-wake behaviors from two weeks to six months. Despite significant developmental and individual changes, individual stability explains a significant amount of the variance on infant sleep-wake behaviors over the first six months of life.     

One-year neurodevelopmental outcome of very and late preterm infants: Risk factors and correlation with maternal stress

Although “late preterm” (LP) newborns (33–36 weeks of gestational age) represent more than 70% of all preterm labors, little is known about the relation between certain risk factors and developmental outcomes in LP compared to “very preterm” (≤32 weeks) children (VP).This study investigates: (1) LP and VP infants’ development at 12 months of corrected age (CA) using the Bayley Scales of Infant Development – 3rd Edition (BSID-III); (2) correlation between BSID-III performances and maternal stress (using Parenting Stress Index-Short Form, PSI-SF) among LP and VP at 12 months CA; and (3) the link between known neonatal and demographic risk factors and developmental outcomes of LP and VP infants.For both LP and VP infants the Mean Cognitive (LP: 102.69 ± 7.68; VP: 103.63 ± 10.68), Language (LP: 96.23 ± 10.08; VP: 99.10 ± 10.37) and Motor (LP: 91.11 ± 10.33; VP: 93.85 ± 10.17) composite scores were in the normal range, without significant differences between the groups. Correlations between PSI-SF and BSID-III showed that in the VP group (but not LP), Language score was negatively related to the PSI-SF ‘Difficult Child’ scale (r = −.34, p < .05). Regression models revealed that cognitive performance was significantly predicted by physical therapy in LP and by cesarean section in VP infants. For VP only maternal education and length of stay predicted Language score, whereas physical therapy predicted Motor score.Results of the study underline the importance of considering cognitive, language and motor developments separately when assessing a preterm child's development. Prediction models of developmental performance confirm the influence of some known neonatal risk factors and indicate the need for further research on the role of sociodemographic risk factors.     

Is sensory processing an issue for infants with colic?

ObjectivesTo determine the association between sensory functioning, sleep, cry/fuss, and feeding behaviors of infants with colic younger than 4 months of age.MethodsDunn’s Infant/Toddler Sensory Profile™ and a modified Barr Baby Day Diary^© were used to assess 44 breastfed infants with colic under four months of age. Colic was defined according to Wessel’s criteria.ResultsThirty-four of the 44 infants with colic (77%) scored as atypical for sensory processing. Of these, 56% scored atypical for sensory processing on quadrant one (Q1) (Low Registration), with 24%, 65%, and 18% scoring as atypical for sensory processing on Q2 (Sensory seeking), Q3 (Sensory sensitivity), and Q4 (Sensation avoiding), respectively. All infants demonstrating sensation avoiding also scored as Low Threshold. A moderate statistically significant correlation was found between sensation seeking and time spent sleeping (r = 0.31; p = 0.04). No other statistically significant associations between infant behaviors and their sensory functioning were demonstrated. Overall, infants demonstrating atypical sensory responses (in any quadrant) slept significantly more than infants demonstrating typical sensory responses (mean difference = −67.8 min/day; 95% CI = −133.6 to −2.1; p = 0.04).ConclusionVery limited associations between infant behaviors and sensory functioning were demonstrated, suggesting that sensory functioning may not be a significant factor in the multifactorial nature of infant colic. Further well-designed studies using validated tools for infants with colic are required to determine whether associations between infant behaviors and sensory functioning exist.     

Sensibilité développementale théorique et empirique des items de la Batterie d’Évaluation Cognitive et Socio-émotionnelle (BECS) pour l’évaluation du développement psychologique de très jeunes enfants au développement typique

The Social and Cognitive Evaluation Battery (SCEB) is an instrument specifically created for the examination of pre-school and school-aged children with autism and intellectual disability and recommended by the French High Health Authority (HAS, 2010, 2011, 2012, 2018). The SCEB explores 16 functional abilities, in both cognitive and socio-emotional areas and allows the calculation of domains and areas developmental levels and heterogeneity indices for the global, cognitive and socio-emotional areas. Each of the 16 domains of the SCEB includes behavioral items hierarchized into 4 developmental levels corresponding to 4 age periods (level 1: 4–8 months; level 2: 8–12 months; level 3: 12–18 months; level 4: 18–24 months). The child's assessment provides a profile of the 16 levels of cognitive and socio-emotional development that can be interpreted within the framework of Piaget's (1977) and Fisher's (1980) theory. The study tests the developmental sensitivity of level scores and their adjustment to chronological ages and developmental ages assessed with the Brunet-Lézine Scale for 65 young typical developmental French children aged from 4 months to 24 months. The results show high sensitivity of scores and satisfactory adjustment to chronological and developmental age differences. Normative benchmarks are also given for indices of heterogeneity of development profiles, heterogeneity that decreases with age. Thus, the scores are interpretable in reference to theoretical models and can be used for the study of all developmental characteristics in infant and toddlers’ children with and without neurodevelopmental disorder.     

Screening Solid Foods Infants 1 (SSFI-1) development of a screening tool to detect problems in the transition from milk to solid food in infants from six to nine months of age

AimTo establish the psychometric properties of a newly developed screening tool Screening Solid Foods Infants 1 (SSFI-1) used by early childhood professionals, to detect problems in the transition from milk to solid food of smooth consistency in infants 6–9 months of age.MethodsThe SSFI-1 score was filled out by the parents of a subgroup with term infants (n = 35); healthy preterm infants (n = 26); infants with comorbidity (n = 17); infants with feeding problems (n = 13). Internal consistency, reproducibility, construct, criterion and related validity was evaluated.ResultsThe preterm subgroup differed significantly in age when starting with fruits/vegetables and period of experience (p < 0.01). The SSFI-1 was sufficiently reliable for the total group and term subgroup (α = 0.78 and 0.76), but not for the preterm and comorbidity/feeding problem subgroup (α = 0.51 and 0.69). Inter-rater reliability was high for the total score (n = 25, ICC r = 0.93), and moderate to good for individual items (weighted kappa range 0.55–0.95). Validity was confirmed by significantly higher scores for the comorbidity/feeding problem subgroups and clinically distinguishable subgroups (p < 0.05) and area under the curve values > 0.78. The initial 10-item screening tool was modified to a seven item screening tool. A SSFI-1 score of 4, +2 SD of the term subgroup, had 76.9% sensitivity and 82.1% specificity, for detecting the presence of a feeding problem.ConclusionThe seven-item screening tool Screening Solid Foods 1 may be used as a screening tool for term infants. Further testing of the SSFI-1 in new infants is needed, to confirm reliability and validity both for term, preterm and (risk for) feeding problem infants.     

The development of perceptual grouping biases in infancy: A Japanese-English cross-linguistic study

Perceptual grouping has traditionally been thought to be governed by innate, universal principles. However, recent work has found differences in Japanese and English speakers’ non-linguistic perceptual grouping, implicating language in non-linguistic perceptual processes (Iversen, Patel, & Ohgushi, 2008). Two experiments test Japanese- and English-learning infants of 5–6 and 7–8 months of age to explore the development of grouping preferences. At 5–6 months, neither the Japanese nor the English infants revealed any systematic perceptual biases. However, by 7–8 months, the same age as when linguistic phrasal grouping develops, infants developed non-linguistic grouping preferences consistent with their language’s structure (and the grouping biases found in adulthood). These results reveal an early difference in non-linguistic perception between infants growing up in different language environments. The possibility that infants’ linguistic phrasal grouping is bootstrapped by abstract perceptual principles is discussed.     

ERICA– an instrument to measure individual and collective regulation of learning

IntroductionThis paper presents two studies that aimed at validating the Individual and Collective Regulation of Learning Scale – ERICA.ObjectiveThe scale was developed to measure learner perceptions of macro-level co-regulation strategies in conjunction with self-regulation strategies learners use.MethodStudies in two separate educational settings are presented. The first with undergraduate psychology students (n = 547) tested the factorial structure and reliability that confirmed its psychometric qualities. The second with undergraduate healthcare students (n = 191) provided for tests of convergent and discriminant validity.ResultsThe studies confirm a six-dimensional structure that stands up to tests of validity for structure, consistency and convergence.ConclusionThe scale is suitable for use in various educational contexts and environments with large cohorts to study perceptions learners have of the strategies learners use related to planning, monitoring, assessment and decision-making regulation phases.     

The dopamine D4 receptor gene,birth weight,maternal depression,maternal attention,and the prediction of disorganized attachment at 36 months of age: A prospective gene × environment analysis

BackgroundEfforts to understand the developmental pathways for disorganized attachment reflect the importance of disorganized attachment on the prediction of future psychopathology. The inconsistent findings on the prediction of disorganized attachment from the dopamine D4 receptor (DRD4) gene, birth weight, and maternal depression as well as the evidence supporting the contribution of early maternal care, suggest the importance of exploring a gene by environment model.MethodsOur sample is from the Maternal Adversity, Vulnerability, and Neurodevelopment project; consisting of 655 mother–child dyads. Birth weight was cross-referenced with normative data to calculate birth weight percentile. Infant DRD4 genotype was obtained with buccal swabs and categorized according to the presence of the 7-repeat allele. Maternal depression was assessed with the Center for Epidemiologic Studies Depression Scale at the prenatal, 6-, 12-, and 24-month assessments. Maternal attention was measured at 6-months using a videotaped session of a 20-min non-feeding interaction. Attachment was assessed at 36-months using the Strange Situation Procedure.ResultsThe presence of the DRD4 7-repeat allele was associated with less disorganized attachment, β = −1.11, OR = 0.33, p = 0.0008. Maternal looking away frequency showed significant interactions with maternal depression at the prenatal assessment, β = 0.003, OR = 1.003, p = 0.023, and at 24 months, β = 0.004, OR = 1.004, p = 0.021, as at both time points, women suffering from depression and with frequent looking away behavior had an increased probability of disorganized attachment in their child, while those with less looking away behavior had a decreased probability of disorganized attachment in their child at 36 months.ConclusionsOur models support the contribution of biological and multiple environmental factors in the complex prediction of disorganized attachment at 36 months.     

Self-uncertainty,social identity prominence and group identification

Drawing on uncertainty-identity theory (Hogg, 2007) and referring to the concept of social identity complexity, we conducted two experiments to test the hypothesis that people would identify most strongly with their group if they felt both self-uncertain and that their group's identity was prominent relative to other identities, either because it was distinct from other identities or because they had few other identities. Self-uncertainty was primed in both experiments after participants had been primed to consider their group's attributes to overlap with or be distinct from the attributes of other identities of theirs (Experiment 1, N = 90) or to consider few or multiple other identities they had (Experiment 2, N = 87). As predicted, group identification was strongest under high uncertainty and when identity distinctiveness or few other identities had been primed. Implications of this research for how we conceptualize identity complexity are discussed.     

The BDNFval66met polymorphism and individual differences in temperament in 4-month-old infants: A pilot study

Individual differences in infants’ temperament are under genetic control. We investigated the association between brain-derived-neurotrophic-factor (BDNF_val66met) polymorphism and temperament in 63 full-term infants. Met-carriers (N = 25) had lower Regulatory capacities compared to val-homozygotes (N = 38). These findings suggest that the BDNF polymorphism affects early temperament individual differences.     

ERP characteristics of sentential inductive reasoning in time and frequency domains

Earlier studies have examined the issues of brain spatial localization in human sentential inductive reasoning using PET/fMRI. However, the temporal characteristics of such reasoning remain unclear. In our present study, we have used ERP (Event-related Potential) to further study human inductive reasoning involving sentential tasks. For congruent induction tasks, in which premises and conclusions are related, participants need to synthesize semantic information from the premises, conclusions, as well as background knowledge, while for incongruent induction tasks (baseline), in which premises and conclusions are unrelated, participants can respond “no” immediately. Behavioral data have been obtained that is consistent with expectations. ERPs imply that participants may integrate semantic information within the time window of 350–650 ms. Statistical analysis in the frequency domain has revealed a significant increase in the power of the gamma band (30–50 Hz) for congruent induction tasks in contrast to incongruent induction tasks.     

Interoceptive sensitivity facilitates both antecedent- and response-focused emotion regulation strategies

The ability to perceive bodily signals (interoceptive sensitivity) modulates emotional experience. However, there is scarce evidence that interoceptive sensitivity also modulates the use of emotion regulation strategies. The present study investigated whether individual differences in interoceptive sensitivity are associated with the habitual use of two main emotion regulation strategies: reappraisal (antecedent-focused) and suppression (response-focused). All participants (N = 402) completed the Emotion Regulation Questionnaire and underwent the heartbeat perception task. Individuals with higher interoceptive sensitivity showed both greater habitual reappraisal and suppression use compared to those with lower interoceptive sensitivity. These findings suggest that better detection of ones' bodily signals facilitates the selection and implementation of antecedent-focused as well as response-focused emotion regulation strategies.     

Children's understanding of posterior probability

Do young children have a basic intuition of posterior probability? Do they update their decisions and judgments in the light of new evidence? We hypothesized that they can do so extensionally, by considering and counting the various ways in which an event may or may not occur. The results reported in this paper showed that from the age of five, children's decisions under uncertainty (Study 1) and judgments about random outcomes (Study 2) are correctly affected by posterior information. From the same age, children correctly revise their decisions in situations in which they face a single, uncertain event, produced by an intentional agent (Study 3). The finding that young children have some understanding of posterior probability supports the theory of naive extensional reasoning, and contravenes some pessimistic views of probabilistic reasoning, in particular the evolutionary claim that the human mind cannot deal with single-case probability.     

Brief pitch-priming facilitates infants’ discrimination of pitch-evoking noise: Evidence from event-related potentials

Pitch is derived by the auditory system through complex spectrotemporal processing. Pitch extraction is thought to depend on both spectral cues arising from lower harmonics that are resolved by cochlear filters in the inner ear, and on temporal cues arising from the pattern of action potentials contained in the cochlear output. Adults are capable of extracting pitch in the absence of robust spectral cues, taking advantage of the temporal cues that remain. However, recent behavioral evidence suggests that infants have difficulty discriminating between stimuli with different pitches when resolvable spectral cues are absent. In the current experiments, we used the mismatch negativity (MMN) component of the event related potential derived from electroencephalographic (EEG) recordings to examine a cortical representation of pitch discrimination for iterated rippled noise (IRN) stimuli in 4- and 8-month-old infants. IRN stimuli are pitch-evoking sounds generated by repeatedly adding a segment of white noise to itself at a constant delay. We created IRN stimuli (delays of 5 and 6 ms creating pitch percepts of 200 and 167 Hz) and high-pass filtered them to remove all resolvable spectral pitch cues. In experiment 1, we did not find EEG evidence that infants could detect the change in the pitch of these IRN stimuli. However, in Experiment 2, after a brief period of pitch-priming during which we added a sine wave component to the IRN stimulus at its perceived pitch, infants did show significant MMN in response to pitch changes in the IRN stimuli with sine waves removed. This suggests that (1) infants can use temporal cues to process pitch, although such processing is not mature and (2) that a short amount of pitch-priming experience can alter pitch representations in auditory cortex during infancy.     

The Situational Test of Emotional Management – Brief (STEM-B): Development and validation using item response theory and latent class analysis

This study uses a 3-Parameter Logistic item response theory (IRT) model to develop an 18-item short-form of the Situational Test of Emotion Management (STEM). In a sample of 900 people, the short form showed acceptable reliability (reliability index = .87; Cronbach’s alpha = .84) and a meaningful correlation with another indicator of emotional intelligence (i.e., r = .30 with the Situational Test of Emotional Understanding). Latent class analysis of the short-form detected two classes. For all items, participants in Class 2 had a higher probability of selecting the best option than Class 1. When response options were coded to represent different emotion regulation strategies, Class 2 had a higher probability of endorsing “situation modification” and Class 1 had a higher probability of endorsing “no regulation”. These results provide validity evidence for the STEM-B as an assessment of emotion regulation.     

Infant patterns of reactivity to tactile stimulation during parent-child interaction

Touch is the primary modality infants use to engage with the world; atypical responses to tactile stimuli may indicate risk for disordered outcomes. The current study examined infants’ responses to tactile stimulation within parent-child interaction, adding to prior knowledge based on parent report. Nine-month-old infants (N = 497) were observed while parents painted and pressed infants’ hands and feet to paper to make designs. Positive and negative affect and gazing away, exploring, and resistance behaviors were coded. Latent Class Analysis of observed behaviors yielded four tactile response patterns partially consistent with current nosology for sensory processing patterns: Low Reactive, Sensory Overreactive, Sensory Seeking, and Mixed Over/Underreactive. To evaluate whether patterns made valid distinctions among infants, latent classes were examined in relation to parent-reported temperament. Infants in the Mixed Over/Underreactive class were rated higher in distress to limitations and activity level than other infants. Sensory processing patterns observed in parent-child interaction are consistent with those identified by parent-report and may be used in future research to elucidate relations with temperament and typical and atypical development.