Problematic dyadic interaction among toddlers and their polydrug‐cocaine‐using mothers

Dyadic interactions between 84 at‐risk toddlers and their nondrug‐, polydrug‐non‐cocaine‐, or polydrug‐cocaine‐using mothers were examined during unstructured play. Coded videotaped behaviors revealed two maternal constructs (interactive competence, maladaptive engagement) and three toddler constructs (responsiveness, active positive initiation, play). Cocaine‐using mothers displayed more maladaptive engagement than did prenatal nondrug users; however, poorer interactive competence further distinguished them from polydrug‐but‐noncocaine users. Toddlers of cocaine‐using mothers displayed less responsiveness and positive initiation than non‐drug‐group peers; however, these behaviors did not reliably differ from polydrug‐non‐cocaine counterparts. Play interest remained relatively similar across groups. Results suggest that difficulties in social interaction appear to continue among cocaine‐using mothers during dyadic exchanges with their offspring in the second year; however, toddler deficits do not appear to be greater than those experienced by polydrug‐non‐cocaine counterparts.     

Perceived quality of maternal care in childhood and structure and function of mothers' brain

Animal studies indicate that early maternal care has long‐term effects on brain areas related to social attachment and parenting, whereas neglectful mothering is linked with heightened stress reactivity in the hippocampus across the lifespan. The present study explores the possibility, using magnetic resonance imaging, that perceived quality of maternal care in childhood is associated with brain structure and functional responses to salient infant stimuli among human mothers in the first postpartum month. Mothers who reported higher maternal care in childhood showed larger grey matter volumes in the superior and middle frontal gyri, orbital gyrus, superior temporal gyrus and fusiform gyrus. In response to infant cries, these mothers exhibited higher activations in the middle frontal gyrus, superior temporal gyrus and fusiform gyrus, whereas mothers reporting lower maternal care showed increased hippocampal activations. These findings suggest that maternal care in childhood may be associated with anatomy and functions in brain regions implicated in appropriate responsivity to infant stimuli in human mothers.     

British English norms for the spontaneous completion of three-letter word stems

Word stem completion tasks involve showing participants a number of words and then later asking them to complete word stems to make a full word. If the stem is completed with one of the studied words, it indicates memory. It is a test widely used to assess both implicit and explicit forms of memory. An important aspect of stimulus selection is that target words should not frequently be generated spontaneously from the word stem, to ensure that production of the word really represents memory. In this article, we present a database of spontaneous stem completion rates for 395 stems from a group of 80 British undergraduate psychology students. It includes information on other characteristics of the words (word frequency, concreteness, imageability, age of acquisition, common part of speech, and number of letters) and, as such, can be used to select suitable words to include in a stem completion task. Supplemental materials for this article may be downloaded from http://brm .psychonomic-journals.org/content/supplemental.     

Prenatal views of baby and parenthood: Association with sociodemographic and pregnancy factors

The aim of the present study was to explore whether sociodemographic and pregnancy factors are associated with the content of prenatal maternal representations about the child and maternity. The study was designed as a questionnaire‐based, anonymous, cross‐sectional study. Participants were 391 pregnant women in routine follow‐up visits enrolled from 14 maternity care centers in Southwestern Finland. Measures consisted of self‐report questionnaires for background data and adjective lists (i.e., semantic differentials) regarding the mother's prenatal view of this child, herself, child's father, and own mother‐as‐mother. Of the nine background factors explored in this study, two factors had significant associations with the content of prenatal representations: a number of children under 7 years of age in the household and (b) planning of the current pregnancy. Prenatal maternal representations about the child, self, partner, and own mother were more negative in content, especially if the mother already had two to three children under 7 years of age, if this pregnancy was not planned, or both. Background factors which did not have significant associations with the content of any prenatal representations included social class, previous abortions, duration of gestation, and somatic problems in this pregnancy. The results are important considering the previous research findings on the role of prenatal representations for the quality of postnatal maternal interactive behavior with the child, intergenerational transmission of attachment security, and developmental outcome of the child later, even in school age. The factors found in this study to have significance for the content of prenatal representations are routinely asked in all maternity care practice and do not need any arrangements to be explored. The results suggest that professionals working in maternity care should pay more attention to the subgroups of pregnant women with many small children in the family and/or whose pregnancy is unplanned. Their need for support in the relationship with this particular child should be especially attended to.     

The Claparède phenomenon: A further example in amnesics,a demonstration of a similar effect in normal people with attenuated memory,and a reinterpretation

Three amnesics and four controls were asked to find hidden objects in cartoon drawings, and their success rate and search speed were noted over five learning trials. When latency on the first trial was equated in the two groups, amnesics were shown to learn the location of the test objects less rapidly than controls. Savings scores at seven weeks were similar in the two groups when amount of exposure during learning was equivalent. At seven weeks amnesics failed to recognize items that they were able to show savings on in terms of speed of search (the Claparede phenomenon), but a similar effect was demonstrated in the control group when tested some 17 months later. The implications of the results for various retrieval-deficit views of the amnesic syndrome were discussed.     

The hippocampus and delayed recall: bigger is not necessarily better?

Healthy young female participants were tested on a measure of delayed verbal recall and then received volumetric Magnetic Resonance Imaging (MRI) scans. The analysis of the MRI scans focused on the volume of the hippocampus. Left hippocampal volume was negatively associated with the level of delayed verbal recall performance. This relationship was confirmed in further testing. This finding is consistent with a previous report of a similar relationship in healthy elderly individuals, but not in patients with Alzheimer's disease, in whom the opposite relationship was observed. An explanation of these findings in terms of impaired neural pruning of the hippocampus is advanced, whereby insufficient pruning of the hippocampus during childhood and adolescence (following adequate growth) may lead to reduced mnemonic efficiency.     

WISC-IV and WISC-III profiles in children with ADHD

Wechsler Intelligence Scale for Children, 3rd and 4th editions (WISC-III n = 586 and WISC-IV n = 118), profiles were compared for children with ADHD and normal intelligence. Mean Verbal Comprehension Index (VCI) and Perceptual Organization/Perceptual Reasoning Index (POI/PRI) scores were significantly higher than Freedom From Distractibility/Working Memory Index (FDI/WMI) and Processing Speed Index (PSI), and Symbol Search was higher than Coding. FDI/WMI and PSI scores were similar on both tests, but VCI and POI/PRI were higher on the WISC-IV than on the WISC-III. Therefore, index discrepancies were greater for the WISC-IV, suggesting that the WISC-IV might be better than the WISC-III in delineating the strengths and weaknesses of children with ADHD. All children in the WISC-IV sample scored lowest on WMI or PSI, whereas only 88% of the WISC-III children scored lowest on FDI or PSI. Thus, the WISC-IV may be more helpful in diagnosing ADHD than the WISC-III.     

Impairment in material-specific long-term memory following unilateral mediodorsal thalamic damage and presumed partial disconnection of the mammillo-thalamic tract

Neuropsychological findings suggest material-specific lateralization of the medial temporal lobe's role in long-term memory, with greater left-sided involvement in verbal memory, and greater right-sided involvement in visual memory. Whether material-specific lateralization of long-term memory also extends to the anteromedial thalamus remains uncertain. We report two patients with unilateral right (OG) and left (SM) mediodorsal thalamic pathology plus probable correspondingly lateralized damage of the mammillo-thalamic tract. The lesions were mapped using high-resolution structural magnetic resonance imaging and schematically reconstructed. Mean absolute volume estimates for the mammillary bodies, hippocampus, perirhinal cortex, and ventricles are also presented. Estimates of visual and verbal recall and item recognition memory were obtained using the Doors and People, the Rey Complex Figure Test, and the Logical Memory subtests of the Wechsler Memory Scales. Each patient's performance was compared to a group of healthy volunteers matched for demographic characteristics, premorbid IQ, and current levels of functioning. A striking double dissociation was evident in material-specific long-term memory, with OG showing significant impairments in visual memory but not verbal memory, and SM showing the opposite profile of preserved visual memory and significantly impaired verbal memory. These impairments affected both recall and item recognition. The reported double dissociation provides the strongest evidence yet that material-specific lateralization of long-term memory also extends to the anteromedial thalamus. The findings are also discussed in relation to proposals that distinct anatomical regions within the medial temporal lobe, anteromedial thalamus, and associated tracts make qualitatively different contributions to recall and item recognition.