Multicategorical spline model for item response theory

Additional information contained in incorrect responses calls for a multicategorical rather than a binary analysis of multiple choice data. A nonparametric divided-by-total model for joint maximum likelihood estimation of probability-of-choice functions (for particular responses) and of latent ability is proposed. The model approximates probability functions by rational splines. Some illustrative examples of real test data analysis and the results of a Monte Carlo study are presented.The research in this paper was supported by the National Sciences and Engineering Research Council of Canada Grants OGP0105521 and APA 320 awarded to the first and the second author, respectively. The authors are indebted to R. Melzack and A. Baker for making available the data analyzed in this paper. We would also like to thank J. McKenna and B. Cont for their assistance in editing this paper.     

The “pill popper”: A device for drug capsule self-administration by primates

An apparatus for establishing self-administration of drugs in capsule preparation form by nonhuman primates is described. The system includes a capsule loading unit combined with a pressurized liquid dispenser and mouth-operated drinking tube lever. Operation of the mouth lever results in forced ingestion of a capsule or other solid substance and a measured quantity of liquid. The components of the system are separately programmable and adjustable to permit shaping of pressurized liquid and capsule ingestion through successive approximations. Examination of absorption factors and temporal variables associated with delay of drug reinforcement onset, as well as precision in oral dosage, are thus possible in a model which approximates the most common method and features of drug self-administration in humans.     

Response patterning on an avoidance schedule as a function of time-correlated stimuli

Control of avoidance response patterning by time-correlated stimuli was studied in rhesus monkeys. At several shock-shock = response-shock intervals, the intervals were divided into 8, 4, or 2 time segments by correlating, respectively, 1, 2, or 4 discrete lights of an eight-light display with each successive segment. A further condition examined response patterning when the avoidance interval was not segmented: all eight lights of the display were lit throughout the interval. Reversal of the order in which the lights were lit in sequence was also examined. Generally, increasing the number of lights lit at one time (decreasing the number of signalled time segments) increased response rates and shifted interresponse time distributions to the left. When the lights were lit one at a time, signalling eight discrete time segments of the interval, response rates were consistently low.     

Not as Different as We Want to Be: Attitudinally Consistent Trait Desirability Leads to Exaggerated Associations Between Personality and Sociopolitical Attitudes

Research connecting sociopolitical attitudes to personality typically relies exclusively on self‐report measures of personality. A recently discovered mechanism of bias in self‐reports highlights a particular challenge for this approach. Specifically, individuals tend to report exaggerated levels of a trait to the extent that they view that trait as desirable. In a community sample of 443 participants, differences in sociopolitical attitudes were associated with differences in the extent to which individuals provided biased self‐reports for a given trait (relative to trait levels indicated by peer‐report or an objective measure) as well as differences in views of the desirability of that trait. Further, the tendency to misrepresent traits in a manner consistent with one's sociopolitical attitudes was mediated by differences in views of trait desirability. Thus, although meaningful personality differences exist among those with differing sociopolitical attitudes, those differences may not be as large as people with opposing sociopolitical attitudes might like them to be.     

Risk and Resilience Factors in Families Under Ongoing Terror Along the Life Cycle

Families of unarmed civilians who live in warzones at political conflict areas are at risk of exposure to traumatic ongoing terrorism (OGT). This paper focuses on families living at the political conflict area by the border of the Gaza Strip at southwestern Israel, who have experienced OGT of missile fire for a decade and a half. Case examples illustrate the nuances and details of traumatic events, such as massive bombing, life threatening situations, evacuation, threat to and loss of life of family members and close friends, and their implications on the family system along life span. Members of these families are at risk of posttraumatic reactions and maladaptive system functioning in relation to the traumatic context of their specific life cycle stage. However, some families have shown potential for developing resilience, related to three main dimensions: belief system, organizational patterns, and communication channels. The objective of the present paper is to shed light, by evidence of families exposed to OGT, on risk and resilience factors affecting a family’s ability to overcome trauma throughout the lifecycle.     

Patients’ Attitudes Towards Disclosure of Genetic Test Results to Family Members: The Impact of Patients’ Sociodemographic Background and Counseling Experience

Many factors predict the intention to disclose genetic information to relatives. The article examines the impact of patients’ socio-demographic factors on their intention to disclose genetic testing results to their relatives. Data were collected in eight genetic clinics in Israel. Patients were requested to fill in a questionnaire after counseling. A convenience sample of 564 participants who visited these clinics was collected for a response rate of 85 %. Of them, 282 participants came for susceptibility testing for hereditary cancers (cancer group), and 282 for genetic screening tests (prenatal group). In the cancer group, being secular and having more years of education correlated positively with the intention to disclose test results to relatives. In the prenatal group, being married and female correlated positively with the intention to disclose. In the cancer group, being religious and with less years of education correlated positively with the view that the clinician should deliver the results to the family. In the prenatal group, being male and unmarried correlated positively with this belief. In both groups, being of young age correlated with the perception that genetic information is private. Varied sociodemographic factors affect the intention to inform family members. Thus, knowing the social background of patients will shed light on people’s attitudes to genetic information and will help clinicians provide effective counseling in discussions with patients about the implications of test results for relatives.     

Visual routines for extracting magnitude relations

Linking relations described in text with relations in visualizations is often difficult. We used eye tracking to measure the optimal way to extract such relations in graphs, college students, and young children (6- and 8-year-olds). Participants compared relational statements (“Are there more blueberries than oranges?”) with simple graphs, and two systematic patterns emerged: eye movements that followed the verbal order of the question (inspecting the “blueberry” value first) versus those that followed a left-first bias (regardless of the left value’s identity). Question-order patterns led substantially to faster responses and increased in prevalence with age, whereas the left-first pattern led to far slower responses and was the dominant strategy for younger children. We argue that the optimal way to verify a verbally expressed relation’s consistency with visualization is for the eyes to mimic the verbal ordering but that this strategy requires executive control and coordination with language.     

Sedentary antlion larvae (Neuroptera: Myrmeleontidae) use vibrational cues to modify their foraging strategies

Learning abilities are exhibited by many animals, including insects. However, sedentary species are typically believed to have low capacities and requirements for learning. Despite this view, recent studies show that even such inconspicuous organisms as larval antlions, which employ an ambush predation strategy, are capable of learning, although their learning abilities are rather simple, i.e., limited to the association of vibrational cues with the arrival of prey. This study demonstrates, for the first time, that antlion larvae can use vibrational cues for complex modifications of their foraging strategies. Specifically, antlion larvae rapidly learn to differentiate between the vibrational cues associated with prey of different sizes, and they save resources by ignoring smaller prey in favour of larger, more energetically profitable prey. Moreover, antlion larvae can learn to associate vibrational cues with the loss of their prey, and they respond by burying their victims under the sand more often and more rapidly than do individuals with no opportunities to form such associations. These findings provide not only new insights into the cognitive abilities of animals but also support for the optimal foraging strategy concept, suggesting the importance of maximizing fitness output by balancing the costs and benefits of alternative foraging strategies.     

Ein psychologisch-onomasiologischer Ansatz zur Auffassung räumlicher Objektrelationen und ihrem sprachlichen Ausdruck: Inklusion und Kontakt

The human conception of spatial relations between objects from an onomasiological and psychological perspective: inclusion and contact Summary. In linguistic semantics, prepositions for spatial relations are considered highly polysemous. While in this field, a semasiological perspective, i.e. the analysis of meaning(s), is preferred, this paper offers a classification as well as a formal definition of the human conception of topological relations between objects from the perspective of onomasiology. It starts from the psychological assumption that objects are assigned both proper places and regions, the interrelations of which lead to nine distinguishable classes of relations between objects pertaining to inclusion and contact. Spatial expressions convey spatial relations on the basis of (or at least independent of) already cognized objects, they do not convey the conception of the related objects themselves. With respect to successful communication, therefore, the polysemy problem turns out to be less important. Zusammenfassung. Raumrelationale Präpositionen werden in der linguistischen Semantik als hochgradig polysem beschrieben. Der dort bevorzugten semasiologischen Bedeutungsanalyse wird aus einer onomasiologischen Perspektive eine Taxonomie der menschlichen kognitiven Auffassung topologischer Objektrelationen gegenübergestellt und formal definiert. Ausgangspunkt ist die psychologische Annahme, daß der Mensch Objekten Eigenörter und Regionen zuweist, aus deren Relationen sich neun unterscheidbare Klassen von Inklusions- und Kontaktrelationen zwischen Objekten ergeben. Da mit raumreferentiellen Ausdrücken Raumrelationen bei gegebener (oder zumindest von der verwendeten Präposition unabhängiger) Kognition der relatierten Objekte vermittelt werden und nicht die Auffassung der Objekte selbst, wird mit Blick auf eine gelingende Kommunikation das Polysemieproblem ein Stück weit 'entzaubert'.