Role of female behavior in controlling population growth in mice

Sex ratio does not appear to be a factor in generating the characteristic population growth curve. Freely growing populations of house mice, consisting of all females and one male, stopped their growth at approximately the same densities as normal sexratio populations used as references. The mechanism(s) of female control of population dynamics may be related to female aggressive behavior. As the all-female/one-male populations approached their maximum size, the females began to show wounding patterns and social hierarchies in much the same manner as males in populations with normal sex ratios. The male in each of the populations was severely wounded in the posterior region, and each lost its tail as a result of injuries which could have been inflicted only by the females. The female social hierarchy can be seen only when there has been reproduction and population growth. Assembled populations of all females rarely exhibit aggressive behavior. Female aggression becomes apparent only when the population approaches its maximum size and thereafter. These data are consistent with the hypothesis that males are competitive among themselves for territory and social rank, and ultimately to mate with the females. Other investigators have indicated that females respond to population size, which may reflect increased competition between the females with the establishment of territories. Thus female agression may control population growth, a role previously ascribed to male aggression.     

Sense,reference and substitution

Philosophical Studies - We show that, contrary to conventional wisdom, Frege’s distinction between sense and reference does not reconcile a classical logic of identity with apparent...     

The influence of alcohol and weapon presence on eyewitness memory and confidence

In this quasi-experimental field study, bar drinkers (0.00–0.23% blood alcohol content) viewed a photographic sequence in which a male took a laptop from a helpdesk assistant, either on loan or at gunpoint. Following a brief retention period, participants answered 20 multiple-choice questions about the male, his actions, and details of the scene, then attempted to identify him from a simultaneous target-present or target-absent line-up. Alcohol was associated with a reduction in correct identifications and an increase in false identifications. Surprisingly, the presence of a weapon in the scene enhanced identification accuracy, though wider scene memory was not influenced by alcohol or the weapon. Findings offer some support for the view that alcohol restricts face encoding, perhaps through the narrowing of attention to salient external features (e.g., hair). We also suggest that curiosity about mock-crime perpetrators may produce weapon focus reversals, although the factors that might elicit such curiosity remain unclear.     

REVIEW OF ANTECEDENT CONTROL: INNOVATIVE APPROACHES TO BEHAVIORAL SUPPORT,EDITED BY J. LUISELLI AND M. CAMERON

This review identifies antecedent manipulation and the role of establishing operations as primary themes of the book as well as crucial elements in the design of a broadly applicable behavior support technology. The discussion of the book's thematic treatment of these elements highlights the traditional importance of elaborate antecedent interactions within the field of behavior analysis and welcomes researchers' efforts to broaden their credibility and influence through comprehensive and durable applications of behavior support technologies in a variety of natural settings. The reviewers rate the book as representative of the most recent developments and directions within applied behavior support.     

Family Assessment Measure (FAM) and Process Model of Family Functioning

This paper provides an overview of twenty years' work in the development of the Family Assessment Measure (FAM), based on the Process Model of Family Functioning. The Process Model describes a conceptual framework for conducting family assessments according to seven key dimensions: task accomplishment, role performance, communication, affective expression, involvement, control, values and norms. The FAM provides measures of these dimensions at three levels: whole family system (general scale, fifty items), various dyadic relationships (dyadic scale, forty-two items) and individual functioning (self-rating scale, forty-two items). In addition, the general scale includes social desirability and defensiveness response style measures. Brief FAMs (fourteen items) are available for each scale as well. The measurement properties of FAM have been evaluated in a variety of clinical and non-clinical settings. Reliability estimates are very good in most contexts. FAM's validity has been supported using a number of techniques. Overall, the weight of the evidence is that FAM's effectively and efficiently assess family functioning and provide strong explanatory and predictive utility. This empirical evidence reinforces experiences of clinicians, indicating that FAM provides a rich source of information on family functioning.     

Fast and accurate measurement of taste and smell thresholds using a maximum-likelihood adaptive staircase procedure.

This paper evaluates the use of a maximum-likelihood adaptive staircase psychophysical procedure (ML-PEST), originally developed in vision and audition, for measuring detection thresholds in gustation and olfaction. The basis for the psychophysical measurement of thresholds with the ML-PEST procedure is developed. Then, two experiments and four simulations are reported. In the first experiment, ML-PEST was compared with the Wetherill and Levitt up-down staircase method and with the Cain ascending method of limits in the measurement of butyl alcohol thresholds. The four Monte Carlo simulations compared the three psychophysical procedures. In the second experiment, the test-retest reliability of MLPEST for measuring NaCl and butyl alcohol thresholds was assessed. The results indicate that the ML-PEST method gives reliable and precise threshold measurements. Its ability to detect malingerers shows considerable promise. It is recommended for use in clinical testing.     

Relationships between adolescents' attachment styles and family functioning

This study examined the relationship between university students' perceptions of their familial attachment and the manner in which their families cope with life's difficulties. It was hypothesized that individuals with high levels of secure attachment would perceive their families as using more active coping strategies (e.g., mobilizing the family to deal with a problem and making efforts to acquire social support). The results supported this hypothesis. Further, individuals with high levels of anxious/ambivalent attachment perceived their families as using a passive appraisal coping strategy, possibly because of a desire to avoid confrontation for fear of disturbing family accord. The findings are discussed in terms of individuals' dispositional coping styles formed as a function of type of familial attachment, as well as situational factors that might serve to mitigate the use of their basic coping strategies.     

A prospective study of psychophysiological arousal, acute stress disorder, and posttraumatic stress disorder

This study investigated the role of acute arousal in the development of posttraumatic stress disorder (PTSD). Hospitalized motor-vehicle-accident survivors (n = 146) were assessed for acute stress disorder (ASD) within 1 month of the trauma and were reassessed (n = 113) for PTSD 6 months posttrauma. Heart rate (HR) and blood pressure (BP) were assessed on the day of hospital discharge. Participants with subclinical ASD had higher HR than those with ASD and no ASD. Participants who developed PTSD had higher HR in the acute posttrauma phase than those without PTSD. Diagnosis of ASD and resting HR accounted for 36% of the variance of the number of PTSD symptoms. A formula composed of a diagnosis of ASD or a resting HR of > 90 beats per minute possessed strong sensitivity (88%) and specificity (85%) in predicting PTSD. These findings are discussed in terms of acute arousal and longer term adaptation to trauma.     

Trend and rhythm analysis of time-series data using complex demodulation

Biological time-series data collected over long intervals generally show combined systematic and periodic fluctuations. Comprehensive analysis of such data requires separation of the trend and rhythmic components. Most available time-series analytic techniques do not explicitly extract the trend, and do implicitly assume the underlying rhythms are simple symmetrical sinusoids, whose amplitude and phase values remain constant throughout the recorded interval. Neither assumption is very accurate when dealing with biological data, and the stationarity assumption in particular becomes harder to defend as experiments extend over days or even weeks. Complex demodulation (CD) is described here as a technique for separation of trend from cyclic components, and multiple complex demodulation (MCD) as a technique for extraction of all possible frequencies in the data set, along with their moment-by-moment amplitude and phase values.     

The calculus of dissent: An analysis of terrorists' choice of targets

This article applies formal modeling to study a terrorist group's choice of whether to attack or not, and, in the case of an attack, which of two potential targets to strike. Each potential target individually takes protective measures that influence the terrorists' perceived success and failure, and, hence, the likelihood of attack. For domestic terrorism, a tendency for potential targets to overdeter is indicated. For transnational terrorism, cases of overdeterrence and underdeterrence are identified. We demonstrate that increased information about terrorists' preferences, acquired by the targets, may exacerbate inefficiency when deterrence efforts are not coordinated. In some cases, perfect information may eliminate the existence of a noncooperative solution.Yet the need for improved international cooperation is growing. Terrorism is inherently international in character, so that, paradoxically, the more individual states improve their national measures, the more it becomes attractive for the terrorists to cross frontiers ... (Wilkinson 1986, p. 49)