Plant Bioinspired Ecological Robotics.

Plants are movers, but the nature of their movement differs dramatically from that of creatures that move their whole body from point A to point B. Plants grow to where they are going. Bio-inspired robotics sometimes emulates plants' growth-based movement; but growing is part of a broader system of movement guidance and control. We argue that ecological psychology's conception of "information" and "control" can simultaneously make sense of what it means for a plant to navigate its environment and provide a control scheme for the design of ecological plant-inspired robotics. In this effort, we will outline several control laws and give special consideration to the class of control laws identified by tau theory, such as time to contact.

A longitudinal and retrospective study of PTSD among older prisoners of war.

OBJECTIVE: The authors examined the longitudinal changes in posttraumatic stress disorder (PTSD) symptom levels and prevalence rates over a 4-year time period among American former prisoners of war (POWs) from World War II and the Korean War. Retrospective symptom reports by World War II POWs dating back to shortly after repatriation were examined for 1) additional evidence of changing PTSD symptom levels and 2) evidence of PTSD cases with a long-delayed onset. METHOD: PTSD prevalence rates and symptom levels were measured by the Mississippi Scale for Combat-Related Posttraumatic Stress Disorder. For the longitudinal portion of the study, participants were 177 community-dwelling World War II and Korean POWs. For the retrospective portion, participants were 244 community-dwelling World War II POWs. RESULTS: PTSD prevalence rates and symptom levels increased significantly over the 4-year measurement interval. Retrospective symptom reports indicated that symptoms were highest shortly after the war, declined for several decades, and increased within the past two decades. Long-delayed onset of PTSD symptoms was rare. Demographic and psychosocial variables were used to characterize participants whose symptoms increased over 4 years and differentiate participants who reported a long-delayed symptom onset. CONCLUSIONS: Both longitudinal and retrospective data support a PTSD symptom pattern of immediate onset and gradual decline, followed by increasing PTSD symptom levels among older survivors of remote trauma.

Parity violation in elastic electron-proton scattering and the Proton's strange magnetic form factor

We report a new measurement of the parity-violating asymmetry in elastic electron scattering from the proton at backward scattering angles. This asymmetry is sensitive to the strange magnetic form factor of the proton as well as electroweak axial radiative corrections. The new measurement of A = -4.92+/-0.61+/-0.73 ppm provides a significant constraint on these quantities. The implications for the strange magnetic form factor are discussed in the context of theoretical estimates for the axial corrections.

Cognitive risk factors and suicide attempts among formerly hospitalized adolescents: a prospective naturalistic study.

OBJECTIVE: To examine the relationship between cognitive variables and time until suicide attempts among 180 adolescents who were monitored for as much as 6.9 years after discharge from an inpatient psychiatry unit. METHOD: In a prospective naturalistic study, adolescents were assessed at the time of their psychiatric hospitalization and semiannually thereafter. Suicidal behavior at index hospitalization and over the follow-up period was assessed with semistructured psychiatric diagnostic interviews. At hospitalization, cognitive risk factors were assessed with a problem-solving task and with questionnaires assessing hopelessness, expectations for posthospitalization suicidal behavior, reasons for living, and dysfunctional attitudes. RESULTS: Expectations about future suicidal behavior were related to posthospitalization suicide attempts. Among youths with previous suicide attempts, higher levels of hopelessness were associated with increased risk, and greater survival and coping beliefs were associated with decreased risk for posthospitalization suicide attempts. Hopelessness and survival and coping beliefs were not related to posthospitalization attempts among adolescents without prior suicidal behavior, and hopelessness was not predictive after controlling for overall severity of depression. CONCLUSIONS: Expectations for suicidal behavior, hopelessness, and survival and coping beliefs provide important prognostic information about later suicidal behavior and should be targeted in interventions with suicidal youths.

Suicide attempts among formerly hospitalized adolescents: a prospective naturalistic study of risk during the first 5 years after discharge.

OBJECTIVE: To examine risk for suicide attempts among 180 consecutively referred adolescents during the first 5 years after discharge from an inpatient psychiatry unit. METHOD: In a prospective naturalistic study, adolescents were assessed at psychiatric hospitalization and semiannually thereafter for up to 5 years with semistructured psychiatric diagnostic interviews and self-report questionnaires. RESULTS: Approximately 25% of the adolescents attempted suicide and no adolescents completed suicide within the first 5 years after discharge. The first 6 months to 1 year after discharge represented the period of highest risk. The number of prior attempts was the strongest predictor of posthospitalization attempts. Affective disorders by themselves did not predict later suicide attempts but were related to posthospitalization attempts when accompanied by a history of past suicide attempts. Independent of psychiatric diagnoses, severity of depressive symptoms and trait anxiety also predicted suicide attempts. Similar to the effect with affective disorders, depressive symptoms were most strongly related to posthospitalization suicidality among adolescents with a prior history of suicide attempts. CONCLUSIONS: Particularly among youths with prior suicidal behavior, clinicians should be alert to the above constellation of psychiatric predictors of posthospitalization suicidal behavior.

Psychiatric diagnoses of previous suicide attempters, first-time attempters, and repeat attempters on an adolescent inpatient psychiatry unit.

OBJECTIVE: To compare psychiatric diagnoses of hospitalized adolescents who (a) have made previous but no recent suicide attempts, (b) have recently made their first suicide attempt, (c) have recently made a second or subsequent attempt, or (d) have never made an attempt. METHOD: Semistructured psychiatric diagnostic interviews were used to determine psychiatric diagnoses and history of recent and previous suicidal behavior of 269 consecutively admitted adolescents to an inpatient psychiatric facility. Forty-nine previously suicidal youths, 28 first-time attempters, and 33 repeat attempters were compared with 159 nonsuicidal youths in prevalence of Axis I psychiatric disorders and psychiatric comorbidity with affective disorder. RESULTS: Previous attempters and repeat attempters both reported more affective disorders, whereas first-time attempters reported more adjustment disorders than nonsuicidal youths. Previous attempters and nonsuicidal youths reported the most externalizing disorders. CONCLUSIONS: Previous attempters on an inpatient unit have multiple psychiatric problems. Like repeat attempters, they often are depressed, but like nonsuicidal youths, they also exhibit significant externalizing behaviors. Interventions with these adolescents should focus not only on immediate presenting problems, but also on ameliorating their long-term risk of posthospitalization suicidal behavior.

Positive and negative life changes following sexual assault.

A longitudinal study was conducted to investigate (a) the timing and course of posttraumatic growth and (b) the relations between positive and negative life changes and posttraumatic distress among recent female sexual assault survivors (N = 171). Most survivors reported positive change even at 2 weeks postassault. Positive changes generally increased over time and negative changes decreased, although change in different domains followed different courses and there was significant individual variability in change patterns. Both positive and negative changes were associated with distress in expected ways, although the relations with negative changes were stronger. The least distress at 12 months was reported by those who noted positive life changes at both 2 weeks and 12 months postassault. Implications for theory and research on posttraumatic growth are discussed.

The use of religious coping during stressful life events: main effects, moderation, and mediation.

The effects of religious coping, the potential moderation of such effects by religious affiliation (i.e., Catholic, Protestant), and the potential mediation of such effects by various factors (i.e., cognitive restructuring, social support, perceived control) were investigated in patients and significant others coping with the stress of kidney transplant surgery. At 3 and 12 months after transplantation, results showed that the use of religious coping was generally associated with better adjustment both concurrently and over time in both patients and significant others. These effects were moderated by religious affiliation, such that religious coping was more effective in promoting adjustment for Protestants than for Catholics. Religious coping was related to adjustment beyond the effects of the proposed mediators. Implications of these results for future research and practice are discussed.

Victim attributions and post-rape trauma.

This study assessed (a) the kinds of attributions victims make, (b) whether behavioral and characterological self-blame are associated with other variables as hypothesized (e.g., perception of future avoidability of being raped), and (c) whether behavioral self-blame is associated with better post-rape adjustment (Janoff-Bulman, 1979). Attributions and adjustment were assessed in a sample of adult female rape victims seen at a hospital-based rape crisis program. Many victims blamed themselves but tended to place more blame on external factors. The pattern of relations between behavioral and characterological self-blame and other attributional measures did not support the hypothesized distinctions between them. Both kinds of self-blame were significantly associated with increased post-rape depression (all ps less than .05). Attributions strongly predicted adjustment, accounting for up to 67% of the variance in 3-day post-rape depression. The theoretical and clinical implications of these findings are discussed.

Test of a method to determine socially acceptable occlusal conditions.

A method for determining the social acceptability for dental appearance across the full range of occlusal conditions found in a natural population was developed and tested. The strategy used in developing the Social Acceptability Scale of Occlusal Conditions (SASOC) was to present photographs of 100 dental study models to a large sample of high school students (n = 880) and their parents (n = 403) whose responses were measured by a semantic differential instrument. After refinement of the semantic differential instrument scale scores were derived for each study model by computing the mean individual scores. Ranks were assigned to the mean scores. The Pearsonian correlation obtained between parent and student subsamples was 0.95. The reliability and validity of SASOC were assessed. COCSTOC measures of specific occlusal traits for these 100 study models are available. The future task involves the development of a highly reliable regression equation for predicting social acceptability scores from a small number of objective physical measurements.

A factor analysis of traits as measured by COCSTOC-MOT to identify occlusal trait combinations.

Occlusal conditions which vary significantly from accepted social norms for dental appearance may socially handicap an individual. An instrument is required by which socially unacceptable occlusal conditions can be identified by members of the public who have internalized society's norms for acceptable dental appearance. The factors identified in this paper make it possible to select a reasonable number (100) of models for constructing a measurement instrument which depicts the full range of occlusal patterns found in a natural population for use in assessing the social acceptability of occlusal conditions. This paper presents the methodology and process used to identify individual occlusal traits which tend to occur together in trait combinations or independently and their range from "normal" to extreme. Data on the frequency distribution of the individual COCSTOC measurements found in a natural population was subjected to a factor analysis which identified 18 occlusal patterns (combinations of traits) and five unique or independent traits or anomalies.

Priorities to preserve fluoride uses: rationales and strategies.

Well-planned, new initiatives are required to preserve fluoride uses, especially water fluoridation. Discussed are barriers to fluoride promotion, evidence about public and health-care providers' knowledge and opinions about fluoride use and decision making, implications of sources of public information on fluorides, consequences to professionals and the public of being misinformed about fluorides, and four general strategies for promoting fluorides under varying conditions. Educational and political initiatives must be appropriate to state needs and conditions. Four broad categories of actions include: diagnosis and planning for education/promotion; public and professional education under both noncontroversial and controversial conditions, political persuasion where required, and changing the context of fluoridation decision making to prevent public referenda on public health measures.

Future elementary schoolteachers' knowledge and opinions about oral health and community programs.

Dental public health practitioners can play a critical role in assuring that elementary schoolteachers have current, scientifically accurate oral health information upon which to base decisions on behalf of the children they teach. Teachers traditionally have educated children about oral health and often participate in school-based prevention programs. This project examined the knowledge and opinions about oral health and community programs, and the perceived future roles and responsibilities in school-based preventive oral health programs, of 313 elementary education majors enrolled at the University of Minnesota. Descriptive results indicate that these future teachers were ill informed and held inconsistent opinions about basic concepts and information related to oral health and oral health promotion. Findings suggest the need for greater public health efforts directed toward improving oral health knowledge and opinions of this influential population about effective community oral health programs.

Oral health education and promotion in maternal and child health: a position paper.

Oral health education and promotion are the connecting mechanisms among prevention, policy development and program implementation, maintenance and evaluation. Given the preventive procedures available today, all focus populations of women and children should have access to accurate information about such procedures as well as access to the procedures themselves. Furthermore, appropriate methodologies need to be utilized for community oral health education and these methods differ from those commonly used for individual education. In the context of maternal and child health there are unprecedented opportunities for new accomplishments in oral health. The health education model most appropriate for these groups is the public health model, an approach designed to empower as well as inform, and one that fosters shared decision making among community members and health professionals. Dental professionals have the responsibility to address this challenge, and to help correct the health information inequities that prevail, especially among the traditionally informationally disenfranchised subfocus populations discussed in this paper.

Issues in the widespread adoption of pit-and-fissure sealants.

Seven issues affecting the use of sealants have been discussed, and five strategies have been suggested to promote their wider use in private and public settings. A strong initiative by industry, in conjunction with organized dentistry and government, is needed to generate public demand and to promote appropriate use by practitioners and auxiliaries. The most fruitful market for sealants at present and in the future may be through public health programs using dental auxiliaries, because the primary prevention of dental caries is stressed more in this area, whereas private practitioners tend to focus more on treating caries. During these times of financial restriction, there is all the more reason to focus effective caries prevention on those tooth surfaces that develop more than half of all carious lesions. The most efficient use of the limited private and public funds that are available to promote oral health must be made. Given the new sealant materials available and the opportunity to delegate their application to auxiliary personnel in both private and public practice, the challenge now is to promote the widespread use of this technology in conjunction with appropriate fluorides so that no child is denied the opportunity to enjoy a caries-free dentition.

School-based preventive regimens and oral health knowledge and practices of sixth graders.

The purpose of this study was to examine the oral health knowledge and reported practices of sixth grade students in Wichita, Kansas. A quasi-experimental design was used to test differences between two groups: (1) children who had completed a four-year regimen referred to as the National Preventive Dentistry Demonstration Program (NPDDP), and (2) a control group of children who had not been exposed to any aspect of the NPDDP. Based on incidental learning theory, the research question was whether or not students' knowledge and practices were consistent with the preventive regimes provided at school. The study reported here was not directly connected with the NPDDP. A school nurse-administered questionnaire was obtained from 284 students 16 months after the NPDDP had terminated. Students in all groups reported similar dental health practices; no practical differences were found among groups with regard to knowledge about appropriate fluoride uses and benefits. Students who received sealants were somewhat more knowledgeable about the use and purpose of sealants. Although students in five of the six NPDDP groups had received preventive regimens, these data suggest that they lacked awareness and understanding of the procedures and their value in preventing oral diseases. Generally, students were unable to discriminate among methods appropriate for preventing dental caries and periodontal diseases. Education regarding the purpose and value of preventive regimens should be consistent with, and an integral part of, the delivery of such services.

Dental hygienists' knowledge and opinions about fluorides and fluoridation.

This article reports results of a study of 563 practicing Minnesota and Wisconsin dental hygienists' knowledge and opinions about fluorides and water fluoridation. Two independent samples were selected randomly from the populations of licensed dental hygienists residing in the two states. Data were collected using a pretested, 42-item, mailed questionnaire. An 84 percent response was achieved with two followup reminders. These data provide baseline information about the caries prevention knowledge and attitudes of practicing dental hygienists in two states. Respondents from both states held similar levels of knowledge about fluorides and opinions about decision making on fluoridation. Fluoride topics, especially water fluoridation, were not receiving high priority in patient education, although nearly all believed that dental hygienists should promote water fluoridation actively. Two-thirds of respondents from both states believed fluoridation decisions should be made by health authorities, rather than by elected officials or through public vote. Greater attention to patient education about fluoride and community water fluoridation is needed by dental hygienists.

Dental hygienists' knowledge, opinions, and use of pit and fissure sealants: a comparison of two states.

This article reports results of a study of 563 practicing Minnesota and Wisconsin dental hygienists' knowledge, opinions, and use of pit and fissure sealants. The study was carried out six months prior to the 1983 NIH Consensus Development Conference on Dental Sealants in the Prevention of Tooth Decay. It therefore provides baseline information for two states prior to the initiation of widespread public information about the positive value of sealants that occurred as a result of that conference. Such baseline information is relevant for future studies of the diffusion of adoption of this caries-preventive technology by dental hygienists. Two independent samples were selected randomly from the populations of licensed dental hygienists residing in the two states. Data were collected using a 42-item mailed questionnaire, with an 84 percent response. Data were analyzed for both interstate and intrastate comparisons. Respondents were generally knowledgeable and had favorable opinions about sealants, although they had low levels of training in their use. Sealants were being used in 54 percent of the offices in which respondents practiced, with the dentist placing them most often. Among hygienists who applied sealants at all, more than two-thirds did so three or fewer times per week. Eighty-four percent indicated they would like to apply sealants more often. The most frequent reasons given for nonuse were lack of acceptance by the dentist-employer and nondelegation.

Knowledge and attitudes of schoolteachers toward oral health programs and preventive dentistry.

Because teachers often take on major roles in school dental health programs, three surveys were completed between 1973 and 1981 to measure teachers' attitudes and knowledge about oral health and their own participation in school programs. The questionnaires were sent to teachers whose schools were included in major dental caries preventive programs and teachers whose schools were not included in such programs. Results showed that: Teachers were quite willing to teach oral health topics and were willing to take on a wide range of teaching, but not administrative, responsibilities. Teachers' acceptance of these responsibilities appeared to decrease during the surveys, possibly as a function of school budget difficulties, indicating a need for incentives and positive rein-forcement. However, their acceptance of responsibilities was not affected by their participation in preventive programs. Schoolteachers had basic misinformation about the purposes of personal oral hygiene, and about the relative effectiveness of measures such as oral hygiene and consumption of fluoridated water in preventing dental caries. The preventive knowledge of teachers was unaffected by either the passage of time or participation in school preventive programs. A series of recommendations is given for the inservice education of school-teachers.

Preventive dental programs for school-age children in 8 countries: pilot survey, 1979.

This paper reports the results of a pilot project, sponsored by the FDI Working Group on Oral Health Promotion, which was designed to describe preventive dental programs for school-age children in 10 countries. A mail questionnaire was developed to obtain information about program philosophy, target population, preventive program components, promotion and educational methods, barriers to program development, program priorities and evaluation methods. In this pilot phase, a total of 27 questionnaires were returned from 8 countries (Argentina, Federal Republic of Germany, France, Japan, Singapore, Sweden, Thailand, United Kingdom). Respondents generally recognized the need to include three major program elements in order to build comprehensive programs, primary preventive measures, early detection and treatment services, and instructional activities for children and adults. Financial problems were cited most frequently as barriers to program development, followed by manpower, public acceptance, policy decisions, policy-maker attitudes, legal constraints and transportation. The domain of educational problems associated with initiating and maintaining children's preventive dental programs is broad and diverse. Educational problems, roles and methods seemed to be pervasive, cutting across all program components. Although the greatest educational emphasis appeared to be on oral hygiene, the need was also recognized to include educational components for each dental program element or service, such as fluoride rinsing. Educational needs related not only to children, but to policy-makers, dental and other health professionals and program and school personnel. The FDI Working Group has expanded the survey and collected data from a much larger number of countries during 1979-1981. Results of the larger survey will be presented at the Annual World Dental Congress of the FDI in Vienna, 1982.