Janet Marquis

Longitudinal change in language production: effects of aging and dementia on grammatical complexity and propositional content.

Mixed modeling was used to examine longitudinal changes in linguistic ability in healthy older adults and older adults with dementia. Language samples, vocabulary scores, and digit span scores were collected annually from healthy older adults and semiannually from older adults with dementia. The language samples were scored for grammatical complexity and propositional content. For the healthy group, age-related declines in grammatical complexity and propositional content were observed. The declines were most rapid in the mid 70s. For the group with dementia, grammatical complexity and propositional content also declined over time, regardless of age. Rates of decline were uniform across individuals. These analyses reveal how both grammatical complexity and propositional content are related to late-life changes in cognition in healthy older adults aswell as those with dementia. Alzheimers disease accelerates this decline, regardless of age.

Relationship of Perceived Adequacy of Services, Family–Professional Partnerships, and Family Quality of Life in Early Childhood Service Programmes

This study applied three family measures (ratings of service adequacy or implementation, satisfaction with the family–professional partnership, and family quality of life) to a sample of families of young children in one Midwestern U.S. state. The results suggest that: (a) families more often believe they are receiving adequate amounts of services for their child, but tend to believe they are not receiving adequate amounts of services for their family; (b) respondents tend to be satisfied with their partnerships with their primary service provider, with lower satisfaction ratings for the providers ability to meet their childs individual needs and to provide information about services; and (c) respondents tended to be more satisfied with their familys material well‐being and less so with their familys emotional well‐being. Finally, we found that service adequacy ratings were a significant predictor of family quality of life, and that partnerships partially mediated this effect. We discuss the research, service, and policy implications of these findings.

A Multi-site Evaluation of Parent to Parent Programs for Parents of Children With Disabilities

This paper describes 2 approaches used to evaluate Parent to Parent mentoring programs in 5 states. Parents were assigned to either a treatment group or a waiting list comparison group. The treatment group participated in Parent to Parent for 2 months. Groups were compared on measures of coping, attitude, and progress on addressing problems. Analyses showed statistically significant positive gains for the parents in the treatment group. Changes on a measure of empowerment were not statistically significant. A qualitative study based on consumer satisfaction interviews with parents provided insight into what makes the Parent to Parent program work. The findings support the value of Parent to Parent self-help programs as one component of a family support system.

Effect of the Number of Scale Points on Chi-Square Fit Indices in Confirmatory Factor Analysis.

This article investigates the effect of the number of item response categories on chi‐square statistics for confirmatory factor analysis to assess whether a greater number of categories increases the likelihood of identifying spurious factors, as previous research had concluded. Four types of continuous single‐factor data were simulated for a 20‐item test: (a) uniform for all items, (b) symmetric unimodal for all items, (c) negatively skewed for all items, or (d) negatively skewed for 10 items and positively skewed for 10 items. For each of the 4 types of distributions, item responses were divided to yield item scores with 2,4, or 6 categories. The results indicated that the chi‐square statistic for evaluating a single‐factor model was most inflated (suggesting spurious factors) for 2‐category responses and became less inflated as the number of categories increased. However, the Satorra‐Bentler scaled chi‐square tended not to be inflated even for 2‐category responses, except if the continuous item data ha...

Language decline across the life span: findings from the Nun study

The present study examines language samples from the Nun Study. Measures of grammatical complexity and idea density were obtained from autobiographies written over a 60-year span. Participants who had met criteria for dementia were contrasted with those who did not. Grammatical complexity initially averaged 4.78 (on a 0-to-7-point scale) for participants who did not meet criteria for dementia and declined .04 units per year; grammatical complexity for participants who met criteria for dementia initially averaged 3.86 and declined .03 units per year. Idea density averaged 5.35 propositions per 10 words initially for participants who did not meet criteria for dementia and declined an average of .03 units per year, whereas idea density averaged 4.34 propositions per 10 words initially for participants who met criteria for dementia and declined .02 units per year. Adult experiences, in general, did not moderate these declines.

Effects of risperidone on Aberrant behavior of persons with developmental disabilities: I. A double-blind crossover study using multiple measures

The efficacy of the atypical antipsychotic risperidone was evaluated in the treatment of aberrant behavior (e.g., aggression, self-injury) in 20 individuals with developmental disabilities. A double-blind, crossover design was used to compare risperidone with placebo in a 22-week trial with a 6-month follow-up phase. Based on a 50% reduction in mean Aberrant Behavior Checklist--Community total scores, 50% of the participants were identified as responders. Naturalistic observations of a subset of five individuals showed that for 4 out of 5 participants, risperidone was effective in reducing aberrant behavior. Side effects included weight gain (84% of participants) and sedation (40% of participants). The advantages of conducting a comprehensive analysis of the effects of medication on aberrant behavior are discussed.

What Is the Reading Component Skill Profile of Adolescent Struggling Readers in Urban Schools

The purpose of this descriptive study was to examine the component reading skills of adolescent struggling readers attending urban high schools. Specifically, 11 measures of reading skills were administered to 345 adolescent readers to gain a research-based perspective on the reading skill profile of this population. Participants were assessed in the domains of word level, fluency, vocabulary, and comprehension. Analysis of the results found that 61% of the struggling adolescent readers had significant deficits in all of the reading components listed above. Subgroups of struggling readers showed similar but more severe patterns. For example, students with learning disabilities scored significantly below the levels of the struggling reader group at large. In contrast, most proficient readers scored high on all measures of reading with above-average component reading skills in word level, vocabulary, and comprehension. The lowest skill area for the proficient reader group was fluency, where they scored at the average level. Implications for policy and instructional programming are discussed.

Maternal Responsivity Predicts Language Development in Young Children With Fragile X Syndrome

The relationship between early maternal responsivity and later child communication outcomes in young children with fragile X syndrome was investigated. Data were obtained from 55 mother-child dyads over a 36-month period. Performance data were obtained at each measurement point from video observations of four different contexts. These were coded for (a) child communication behaviors, (b) parent responsivity, and (c) behavior management behaviors. Results indicate that early maternal responsivity predicts the level of four important child language outcomes at 36 months of age after controlling for child developmental level and autism symptomology.

Statistical analysis of data from studies on experimental autoimmune encephalomyelitis

Research in multiple sclerosis often employs animal models of the disease, especially experimental autoimmune encephalomyelitis (EAE) in rodents. The statistical analysis procedures chosen for these studies are often suboptimal, either because of violations of the assumptions of the procedure or because the analysis selected is inappropriate for the research question. In this paper, we discuss the types of research questions frequently asked in EAE studies and suggest appropriate and useful research designs and statistical methods that will optimize the information contained within the data. We also discuss other troublesome issues such as missing data, atypical disease profiles, and power analysis.

The acquisition of tense in English: Distinguishing child second language from first language and specific language impairment

This study reports on a comparison of the use and knowledge of tense-marking morphemes in English by first language (L1), second language (L2) and specifically language-impaired (SLI) children. The objective of our research was to ascertain whether the L2 childrens tense acquisition patterns were similar or dissimilar to those of the L1 and SLI groups, and whether they would fit an (Extended) Optional Infinitive profile, or an L2-based profile, e.g., the Missing Surface Inflection Hypothesis. Results showed that the L2 children had a unique profile compared with their monolingual peers, which was better characterized by the Missing Surface Inflection Hypothesis. At the same time, results reinforce the assumption underlying the (Extended) Optional Infinitive profile that internal constraints on the acquisition of tense could be a component of L1 development, with and without SLI.