Shogo Hirata

Features of Stroop and Reverse-Stroop Interference: Analysis by Response Modality and Evaluation:

Stroop interference (the Stroop effect) is the phenomenon observed when naming the color of an incongruent stimulus, such as the word “red” printed in blue ink; typically, this color incongruence causes slower naming compared to a neutral stimulus, such as a blue square patch. Reverse-Stroop interference occurs when reading the stimulus takes longer than reading the neutral stimulus. Features of Stroop and reverse-Stroop interference were examined, focusing on the difference between the response modalities — oral response and manual response — and the difference between methods of evaluating performance (time or correct responses) and the interference score. Participants were 47 students (30 women, 17 men; M age = 20.8 yr., range = 19–29). The results were as follows: (1) the performance of the reverse-Stroop condition was higher than that of the Stroop condition for both oral and manual responses; (2) the Stroop interference score was significantly greater with the oral response than with the manual response; and (3) the reverse-Stroop interference score was constant regardless of the response modality. The results were discussed with respect to differences in processing speeds of verbal and sensory information.

Relationship between motor skill and social impairment in children with autism spectrum disorders

Abstract Aim: The purpose of this study was to investigate the relationship between motor skill and social impairment in children with autism spectrum disorders (ASD). Methods: The subjects were 26 children with ASD aged 7–16 years. Their intelligence quotients (IQ) ranged from 73 to 124. We conducted two tasks: movement assessment battery for children-2 (MABC-2) and social responsiveness scale (SRS). The MABC-2 is a motor test that can assess total motor ability, and three sub-domain abilities. SRS is a parent questionnaire that can assess individual differences in social impairment. Results: In the children with ASD in this study, difficulty with manual dexterity was the most frequently occurring problem. Also, their individual differences in social impairment were strongly interrelated with problems with manual dexterity. Interpretation: These results suggest that when MABC-2 is administered to children with ASD but without severe cognitive impairment, due attention should be paid to their manual dexterity (MD) score.

Applicability of the Movement Assessment Battery for Children-Second Edition to Japanese children: A study of the Age Band 2

BACKGROUND The diagnosis of Developmental Coordination Disorder (DCD) requires a precise assessment of motor skills via a standardized tool such as the Movement Assessment Battery for Children-Second Edition (MABC-2). Although the MABC-2 has been widely used in English-speaking countries, to the best of our knowledge, no studies have examined its applicability to Japanese children. Thus, it has been difficult to diagnose DCD in Japan. AIMS As a preliminary investigation preceding its formal standardization in Japan, we examined the applicability of the MABC-2. METHODS AND PROCEDURES Participants comprised 132 typically developing Japanese children who completed a test set of the MABC-2 for Age Band 2. We analyzed both internal consistency and factorial validity for our Japanese sample. We also included a comparison between our sample of Japanese children and the normative sample of the MABC-2, as well as an examination of gender differences. OUTCOMES AND RESULTS Our results indicated acceptable internal consistency and scale homogeneity. High factorial validity, which has not been examined in other populations, was also confirmed for the test set. Moreover, we found differences in component scores between the Japanese and normative children with respect to Manual Dexterity and Balance. We also found that girls obtained superior Manual Dexterity and Balance scores compared with boys. CONCLUSIONS AND IMPLICATIONS The present findings represent the first step towards the standardization of the MABC-2 in a Japanese population.

Motor Skills and Social Impairments in Children With Autism Spectrum Disorders

The purpose of this study was to examine the relationship between the Japanese version of the Developmental Coordination Disorder Questionnaire (DCDQ-J) and the Social Responsiveness Scale (SRS) in Japanese children with autism spectrum disorders (ASD). The participants were 19 children with ASD. The DCDQ-J is a parent questionnaire that can assess the degree of motor skill impairments, and the SRS assesses the severity of social impairments. To check the criterion-related validity of the DCDQ-J in children with ASD, the Japanese version of the Movement Assessment Battery for Children-2 (MABC2-J) was also conducted. The total score of the DCDQ-J was significantly negatively correlated with the SRS score in the same way as the MABC2-J total score. These results indicate that the severity of social impairments in children with ASD is related not only to the child’s fundamental motor abilities but also to practical motor skills in everyday life.

Relationship between Stroop/reverse-Stroop interference and postural sway when standing in elderly people1, 2

Abstract Prefrontal brain functions are reported to be involved in postural control. This study examined the correlation between a postural control task and a Stroop/reverse-Stroop test that also taps the prefrontal brain functions. Twenty healthy elderly people (3 men, 17 women) ages 61–81 years participated. Stroop interference and reverse-Stroop interference were measured. The postural control task required participants to stand as still as possible for 30 sec. with eyes open and then with eyes closed. Reverse-Stroop interference, which is reported to activate more prefrontal function, correlated positively with postural sway when standing with eyes closed. Prefrontal function may be an important component of postural control when sensory information is insufficient.

Temporal and spatial parameters of stepping in place in children and adults.

Characteristics of synchronized and self-paced stepping in place were examined by analyzing a temporal parameter (step frequency) and a spatial parameter (step height). Participants were 20 adults (10 women, 10 men; M age = 22.5 yr., range = 21–23) and 10 children (5 girls, 5 boys; M age = 6.1 yr., range = 5–6). Results indicated that: (1) the step frequencies, which were equivalent for both groups, were well coincident with stimulus frequencies; (2) when step frequencies were imposed, the step height decreased with increasing step frequency, except for the lowest frequency condition in children; (3) movement consistency was the highest at 2 Hz and deteriorated if the step frequency was higher or lower; and (4) the self-paced stepping in place was optimal in terms of movement consistency. These results showed that stepping in place is a rhythmic movement at a given range of frequency which is coordinated so as to keep the product of step frequency and step height constant.

Memory Strategies for Serial Recall in Adults with Intellectual Disabilities

This study was conducted to investigate the memory strategy for serial recall in adults with general intellectual disability (ID) using the picture memory span task. Relations between memory strategies and two aspects of intellectual abilities, i . e ., verbal and nonverbal abilities, were investigated. Study participants were 19 adults with general ID ( i.e., ID of unknown etiologies). The picture memory span task, which can assess features of memory coding, was administered under four conditions: control, visually similar, phonologically similar, and long-name condition. The picture vocabulary test – revised (PVTR) and Raven color progressive matrices (RCPM) were conducted. Performance on the picture memory span task revealed that participants with ID used visual and verbal strategies for memory coding. Individual differences in verbal ability were interrelated with the degree of verbal strategy use. Results of this study suggest that features of memory coding of adults with ID do not contradict their level of intellectual development.

Applicability of the Movement Assessment Battery for Children-Second Edition (MABC-2) for Japanese Children Aged 3–6 Years: A Preliminary Investigation Emphasizing Internal Consistency and Factorial Validity

This study investigated the applicability of the Movement Assessment Battery for Children – Second Edition (MABC-2) for 3- to 6-year-old Japanese children, particularly addressing its internal consistency and factorial validity. The MABC-2 test set for 3- to 6-year-old children was administered to 252 children. Differences between Japanese children and those of the original normative sample (i.e. United Kingdom children) were investigated along with sex differences. The Japanese children aged 3–6 years were found to have higher Manual Dexterity and Balance component scores than children of the normative sample. Girls scored higher than boys on the Balance component. Results of several analyses showed good internal consistency of the MABC-2. Confirmatory factor analysis revealed that a theoretical three-component model of the MABC-2 was not fitted to Japanese children aged 3–6 years. Instead, a new three-component model was postulated and discussed. The new three-component model of the MABC-2, with Manual Dexterity, Static Balance and Ball Skills, and Dynamic Balance, has high factorial validity in Japanese children aged 3–6 years.

Role of inner speech on the Luria hand test

Abstract This study was conducted to investigate the psychological characteristics of the Luria hand test (LHT), a well-known neuropsychological assessment. We investigated the role of inner speech in LHT using the dual-task paradigm. Additionally, we investigated the relation between LHT and Wechsler Memory Scale—Revised (WMS-R) scores. Performance of the 21 university student participants on the LHT decreased significantly in the articulatory suppression condition, but not in spatial suppression. This result indicates that the inner speech or phonological loop of working memory plays an important role in the LHT. Moreover, only the verbal memory score of the WMS-R was correlated significantly with LHT performance. Based on these results, psychological characteristics of the LHT were discussed.

Role of Inner Speech on Serial Recall in Children with ASD: A Pilot Study Using the Luria Hand Test

This study was conducted to investigate the relation between the effect of articulatory suppression on the serial recall and severity of social impairments among children with autism spectrum disorders (ASD). The Luria hand test (LHT) was administered to evaluate the capacity for serial recall in 13 children with ASD. The LHT was administered under three conditions: control, under articulatory suppression, and under spatial suppression. Performance on the LHT of children with ASD was significantly lower in terms of both articulatory suppression and the spatial suppression condition. Moreover, the severity of social impairment in children with ASD was related to individual differences of effects of articulatory suppression on the LHT, but not with effects of spatial suppression. These results support the notion that dialogic inner speech which mediates complex cognitive abilities has inherently social origins.