Referenzsemantik in der Partnermodellierung

How can we explain that an assertion on something perceived can be understood in the same manner by somebody who cannot perceive that scene? This problem bases the interest in computational linguistics in how listener modeling could possibly be harmonized with reference semantics. Mental images substituting real perception appear as a way out. The architecture of the listener model has to be adapted to the creation and use of such pictorial data structures. Furthermore, the relation between the latter and a verbal (i. e., propositional) representation must be understood. The resulting architecture of a listener model with reference semantics can be employed to solve communicational problems from three general classes in a better way, as is demonstrated by an example implementation.     

Colour vision,evolution, and perceptual content

Computational models of colour vision assume that the biological function of colour vision is to detect surface reflectance. Some philosophers invoke these models as a basis for externalism about perceptual content (content is distal) and objectivism about colour (colour is surface reflectance). In an earlier article (Thompson et al. 1992), I criticised the computational objectivist position on the basis of comparative colour vision: There are fundamental differences among the colour vision of animals and these differences do not converge on the detection of any single type of environmental property. David R. Hilbert (1992) has recently defended computational objectivism against my comparative argument; his arguments are based on the externalist approach to perceptual content originally developed by Mohan Matthen (1988) and on the computationally inspired theory of the evolutionary basis for trichromacy developed by Roger N. Shepard (1990). The present article provides a reply to Hilbert with extensive criticism of both Matthen's and Shepard's theories. I argue that the biological function of colour vision is not to detect surface reflectance, but to provide a set of perceptual categories that can apply to objects in a stable way in a variety of conditions. Comparative research indicates that both the perceptual categories and the distal stimuli will differ according to the animal and its visual ecology, therefore externalism and objectivism must be rejected.Versions of this article were read to the Department of Philosophy at the University of Chicago and to the Department of Philosophy at Boston University. I am grateful to the audiences for the discussions that ensued. I am also grateful to an anonymous referee for constructive criticism of certain points in the article. Special thanks are due to my comparative colour vision collaborators, Adrian Palacios and Francisco Varela.     

Romantic partners and body image disturbance: Further evidence for the role of perceived—actual disparities

In this study, female and male college dyads (primarily Caucasian) involved in a “romantic relationship” used schematic figures to rate their conceptions of body size on a variety of rating protocols, including actual self, ideal self, ideal opposite gender, perceived partner's ideal opposite gender, perceived partner's rating of self, and rating of partner's body size. Based on the reflected-appraisal literature and previous body image research on perceived—actual disparities in body size ratings, five discrepancy indices were created and related to dispositional levels of body image disturbance, eating dysfunction, and general psychological function (self-esteem, depression). The results clearly indicated gender differences in the particular predictor associated with all measures of disturbance. For females, the discrepancy between the Self rating and the Perceived Partner's Ideal Other Gender rating accounted for almost all of the variance associated with clinical indices of disturbance. For males, the discrepancy between the Self rating and the Actual Partner's Ideal Other Gender rating was the only important predictor to emerge in regression analyses. The findings are interpreted in light of recent research on actual/perceived differences in body size ratings.     

Stereotyped movement disorder in an adult following acquired brain injury: Effect of environmental stimulation

In the present study, a naturalistic functional analysis procedure was used to assess the effect of environmental stimulation on the stereotypic behavior (body rocking) of an adult whose stereotypy appeared to be induced by an acquired brain injury. Environmental stimulation, operationalized in terms of both physical and social characteristics, resulted in only minimal changes in the occurrence of body rocking. Body rocking occurred in excess of 50% of the observations in all environmental stimulation conditions and in a naturally occurring baseline condition. To our knowledge, this is the first published report of a functional analysis of stereotypy associated with acquired brain injury.     

The effects of maternal employment and non-maternal infant care on development at two and four years

Differences in maternal employment during children's first year of life and children's entry into non-maternal care before the age of 1 year failed to predict differences in cognitive and socioemotional development at 2 and 4 years of age, after family background variables were controlled. Two samples were studied: a population sample of 1100 Bermudian children and a smaller subsample of children most of whom were determined to be at risk for developmental problems. To assess the effects of maternal employment, we compared infants with mothers who worked 20 or more hours a week to infants with mothers who worked less than 20 hours a week. To assess the effects of entry into non-maternal care before the age of one, we compared infants who were placed in regular non-maternal care before the age of one versus infants who did not experience regular non-maternal care before the age of one. The results revealed that family background variables frequently predicted many child outcome measures in both the total sample and the smaller research sample. After controlling for family characteristics, no differences were found between children whose mothers worked 20 or more hours a week when they were infants and children with mothers who worked less than 20 hours a week in either sample. In addition, age of entry into non. maternal care before the age of one did not significantly predict any child outcome measures.     

Sensitivity to combinations of musical parameters: Pitch with duration,and pitch pattern with durational pattern

In four experiments, listeners’ sensitivity to combinations of pitch and duration was investigated. Experiments 1–3 involved “textures” of notes, which were created by repeatedly sounding one of two notes (e.g., C₄ quarter note; D₄ eighth note), so that each note had an equal chance of occurring at any point within a texture. Experiment 1 showed that if a texture change was effected by introducing a pitch or duration that was not in the initial texture, the change was perceived by both attentive and distracted listeners. If a texture change was effected by combining the pitch of one note with the duration of the other note in the initial texture, and vice versa, it was perceived only if the listeners were attentive. Sensitivity to pitch/duration combinations was poorer when the pitch difference between component notes of textures was increased (Experiment 2), but it was better when the difference in duration between component notes was increased (Experiment 3). In Experiment 4, listeners’ sensitivity to combinations of pitch pattern and durational pattern in brief sequences was examined. Listeners were sensitive to the manner in which parameter patterns were combined when they were attentive, but not when they were distracted. The results are discussed in view of featureintegration theory and its application to music cognition.     

Illusions of Safety in a Risky World: A Study of College Students' Condom Use

The role that costs, benefits, and perceptions of invulnerability play in condom use was examined in a sample of students ( N = 211) at 4-year and 2-year colleges. In multiple regression analyses, past condom use was related to relative invulnerability, low present risk, and inexperience. Less intended condom use was associated with high perceptions of relative invulnerability and low perceptions of present risk. It appears that many college students feel protected from HIV because they judge their current sexual environment to be safe due to monogamy, sexual history taking, and the ability to tell a partner's HIV status. Independent of that, feelings of relative invulnerability are associated with more condom use—perhaps an accurate judgment of past risky behavior.     

THE TREATMENT OF COVERT SELF-INJURY THROUGH CONTINGENCIES ON RESPONSE PRODUCTS

Assessment and treatment of covert self-injurious behavior are complicated because it is difficult to quantify and apply differential consequences to covert responses. In this study, both tangible and social reinforcers were identified using reinforcer assessment methods. These reinforcers were then provided contingent upon the absence of tissue damage identified during physical examinations, resulting in near 100% success in physical assessment checks that was maintained over 10 months.