[Selection of goal-directed information triggers removal of irrelevant information from working memory].

This study investigated the triggers for removing irrelevant information from working memory. Based on the perspective that removal is a unique process of updating working memory (Ecker et al., 2010), we hypothesized that the removal process begins after selection of task-relevant information. To test this hypothesis, we employed a modified Sternberg task that reflects the time-course for the removal of information. In a standard procedure of this task, the removal process is thought to be completed in approximately 1,500 ms after directing relevant information. If selection induces removal, removal might not end within 1,500 ms when selection requires more time. To increase the time for selection, we created a circumstance with high interference. Experiment 1 showed that removal was incomplete within 2,000 ms after directing relevant information. Experiment 2 showed that removal could be completed given more time. These results support the hypothesis that the trigger for the removal process is the completion of selection. This is in consistent with recent frameworks concerning executive functions.

[Observing grasping action from egocentric perspective modulates observer's visual attention].

Previous studies demonstrated that observing another person's grasp action modulated the observer's attention to the object in a manner congruent with another person's action goal. These studies suggest that this grasp-cueing effect results from representation of the observer's understanding of action intention in the mirror neuron system. This system serves as the neural mechanism underlying action-oriented goals, regardless of whether they are those of the observer or others. The present study examined whether the grasp-cueing effect emerged even when a grasp action was observed from an egocentric (observer's own) perspective. Reaction times were faster when the target was presented over the object that was congruent with the action goal implied by the size of the hand aperture. This indicated that the grasp cueing effect occurred when the stimulus was observed from an egocentric perspective, consistent with the view that this effect resulted from the observer's understanding of action intention as represented in the mirror neuron system.

[Does action semantic knowledge influence mental simulation in sentence comprehension?].

This research investigated whether action semantic knowledge influences mental simulation during sentence comprehension. In Experiment 1, we confirmed that the words of face-related objects include the perceptual knowledge about the actions that bring the object to the face. In Experiment 2, we used an acceptability judgment task and a word-picture verification task to compare the perceptual information that is activated by the comprehension of sentences describing an action using face-related objects near the face (near-sentence) or far from the face (far-sentence). Results showed that participants took a longer time to judge the acceptability of the far-sentence than the near-sentence. Verification times were significantly faster when the actions in the pictures matched the action described in the sentences than when they were mismatched. These findings suggest that action semantic knowledge influences sentence processing, and that perceptual information corresponding to the content of the sentence is activated regardless of the action semantic knowledge at the end of the sentence processing.

[Scale for assessing interests of Japanese elderly people in their daily life].

OBJECTIVE: Programs to support independent living for elderly people are generally designed taking into account physical and psychological conditions. The interests of individuals are diverse even when the physical conditions are the same. Interests in daily life are important factors for adequate planning of the programs for independent living. The purpose of this study was to examine an evaluation structure of interests of Japanese elderly people in their daily life. METHODS: Focus group interviews were conducted to collect items for interests in daily life by several researchers targeting activity groups of elderly people. Eighteen items were extracted from a total of 50 following the principles: (1) Items with similar meanings are brought together; (2) Items which might have big differences in meaning depending on the subject were excluded; and (3) Items which were double barreled were excluded. The questionnaire 18 items were designed to give a 4-point Likart scale for answers from "very important" to "not important at all". The survey was conducted in 20 municipalities all over Japan in 2000. From residents aged 65 years and over, 6,094 individuals were selected randomly as the study population. RESULTS: Of 5,565 participants, 4,527 individuals answered all 18 items. "To have a good time with the family" was the favorite answer (54.8%), rated as "very important". Four factors (eigenvalue > 1) were extracted by applying principal component analysis: "to live with good communication", "to achieve one's purpose", "to live socially", and "to live comfortably". "To live with good communication" showed the highest score and "To live socially" showed the lowest score. CONCLUSION: With this scale, we could precisely determine the diversity of interests of Japanese elderly people in their daily life. We suggest that this scale might be useful not only to analyze the interests of individuals, but also to plan programs in terms of quality of life or independent living in late life.

[Factors associated with self-rated health for non-institutionalized aged persons].

OBJECTIVE: To determine factors affecting self-rated health among the non-institutionalized elderly in Japan. METHODS: In 20 municipalities in Japan, 6,094 persons aged 65 years and older who were not institutionalized were selected at random. A questionnaire survey was conducted from September through November 2000. The distribution of self-rated health was rated in terms of dependent variables, with odds ratios and their 95% confidence intervals calculated using unconditional logistic models. RESULTS: Of the study population, 5,565 persons (91.8%) responded to the survey. Of the respondents, 64.4% answered that they were healthy, while 28.8% were not. The necessity for periodical visit to hospitals and clinics, and lowering of the activity of daily living greatly lowered self-rated health. Compared with those who were 85 years of age or older, a high health status was observed among those aged between 75 and 84 years, but not those aged 65 to 74 years. Those who tried to have exercise periodically, who had a vice-leadership role in a group, who joined social activities, who lived what they considered a worthwhile life, and who had positive positive activities in daily life, had high levels of self-rated health. Joining social activities for passive reasons elevated the health as well as joining for active reasons such as "because it is fun." CONCLUSION: Even if the reason is passive, joining social activities may elevate the self-rated health levels of elderly people.