Familiarity breeds searching: infants reverse their novelty preferences when reaching for hidden objects

What infants appear to know depends heavily on how they are tested. For example, infants seem to understand object permanence (that objects continue to exist when no longer perceptible) within the first few months of life when this understanding is assessed through looking measures, but not until several months later when it is assessed through search measures. One explanation of such results is that infants gradually develop stronger representations of objects through experience, and that stronger representations are required for some tasks than for others. The current study confirms one prediction from this account: Stronger representations of familiar objects (relative to novel objects) should support greater sensitivity to their continued existence. After seeing objects hidden, infants reached more for familiar than novel objects, in striking contrast to their robust novelty preferences with visible objects. Theoretical implications concerning the origins of knowledge are discussed.     

Developmental cognitive neuroscience: progress and potential

Developmental cognitive neuroscience is an evolving field that investigates the relations between neural and cognitive development. Lying at the intersection of diverse disciplines, work in this area promises to shed light on classic developmental questions, mechanisms subserving developmental change, diagnosis and treatment of developmental disorders, and cognitive and neuroscientific topics traditionally considered outside the domain of development. Fundamental questions include: What are the interrelations between developmental changes in the brain (e.g. in connectivity, chemistry, morphology) and developmental changes in children's behavior and cognitive abilities (e.g. representational complexity, ability to sustain selective attention, speed of processing)? Why, and how, is learning enhanced during certain periods in development? How is our knowledge organized, and how does this change with development? We discuss preliminary investigations of such questions and directions for future work.     

Demographic correlates of constant condom use among sex workers in Tangail, Dhaka, Bangladesh

Consistent condom use, particularly by promiscuous individuals, is a major safeguard against sexually transmitted diseases, including HIV/AIDS. This study examines some demographic factors that may affect such use among Bangladeshi female commercial sex workers at a brothel in Tangail (n = 196; mean age = 23.44 years), and the streets of Dhaka (n = 112; mean age = 25.92 years). The chi2 results indicated that sex workers over 19 years of age were 2.52 times more likely than adolescents under 19 to work on the street rather than at a brothel (chi2 = 8.73, p < .0.01, OR = 2.52, 95% CI = 1.35-4.72). Brothel sex workers aged over 19 years reported 3.26 probability to regularly use condom with clients than those adolescents aged below 19 years (chi2 = 6.23, p < 0.01, OR = 3.26, 95% CI = 1.25-8.53). This study found age to be a significant demographic correlate of regular condom use, particularly, among the brothel workers.     

Why won’t you do what I want? The informative failures of children and models

Computational models are powerful tools – too powerful, according to some. We argue that the idea that models can “do anything” is wrong, and we describe how their failures have been informative. We present new work showing surprising diversity in the effects of feedback on children's task-switching, such that some children perseverate despite this feedback, other children switch as instructed, and yet others play an “opposites” game without truly switching to the newly instructed task. We present simulations that demonstrate the failure of an otherwise-successful neural network model to capture this failure. Simulating this pattern motivates the inclusion of updating mechanisms that make contact with a growing literature on frontostriatal function, despite their absence in theories of the development of cognitive flexibility. We argue from this and other examples that computational models are more constrained than is typically acknowledged and that their resulting failures can be theoretically illuminating.     

Developing Cognitive Control: Three Key Transitions

The ability to flexibly break out of routine behaviors develops gradually and is essential for success in life. We discuss three key developmental transitions toward more flexible behavior. First, children develop an increasing ability to overcome habits by engaging cognitive control in response to environmental signals. Second, children shift from recruiting cognitive control reactively, as needed in the moment, to recruiting cognitive control proactively, in preparation for needing it. Third, children shift from relying on environmental signals for engaging cognitive control to becoming more self-directed. All three transitions can be understood in terms of the development of increasingly active and abstract goal representations in prefrontal cortex.     

So many options,so little control: Abstract representations can reduce selection demands to increase children’s self-directed flexibility

Children often struggle to behave flexibly when they must use self-directed goals (e.g., doing homework without prompting) rather than externally driven goals (e.g., cleaning up when told). Such struggles may reflect the demands of selecting among many potential options, as required for self-directed control. The current study tested whether (a) 6-year-old children show difficulty in selecting among competing semantic representations, (b) providing category labels designed to reduce selection demands improves performance, and (c) such benefits transfer to self-directed flexibility. Selection was measured using the blocked cyclic naming task for the first time with children. Pictures were named repeatedly in either homogeneous blocks from the same category (e.g., all animals), which create high selection demands due to spreading semantic activation and engage effortful cognitive control, or mixed blocks with each picture from a different category. Children showed robust difficulty in selecting among options, as indexed by response time (RT) differences between homogeneous and mixed blocks. Providing subcategory labels designed to reduce selection demands by distinguishing among same-category items (e.g., “A cow is a farm animal. A cat is a pet.”) improved selection. Providing superordinate categories (e.g., “A cow is an animal. A cat is an animal.”) also improved selection, but these benefits were less robust, and subcategory labels led to greater benefits than superordinate category labels on a subsequent verbal fluency task. These results support a role for subcategory representations in reducing selection demands to aid self-directed flexibility while suggesting that some children may use superordinate category labels to activate subcategory representations on their own.     

Correlates of adolescent assertiveness with HIV avoidance in a four-nation sample

Adolescents are frequently admonished to be socially assertive in order to confront negative interpersonal peer influences. Since the advent of HIV/AIDS in human social chemistry, the admonition has become more critical than ever. But the warning is often proffered in the misguided presumption that social assertiveness is the all-required psycho-structure against risk. The present cross-national study examines social and sexual assertiveness in four-country adolescent samples of Nigerian, Thai, Chinese, and Japanese college students. The findings reveal that sexual rather than social assertiveness was the sine qua non against risk, cross-culturally.     

The place of advice: Japanese parents' sources of information about childrearing and child health

A survey of 1,150 fathers and 1,147 mothers in four regions of Japan (mean ages: FATHERS = 36.7, MOTHERS = 33.8, CHILDREN = 4.4 years) documented Japanese parents' sources of advice and information about young children. Mothers reported receiving more advice and information from more sources, compared with fathers. However, more husbands and wives cited “my spouse” than any other potential source of advice, and men and women expressed a high level of confidence in each other. Relatively few parents said that they had used professional advice. It is apparent that various sources of parenting knowledge can be facilitated to alleviate the stress felt by today's increasingly isolated parents.