Trusting in others’ biases: Fostering guarded trust in collaborative filtering and recommender systems

Collaborative filtering is being used within organizations and in community contexts for knowledge management and decision support as well as the facilitation of interactions among individuals. This article analyzes rhetorical and technical efforts to establish trust in the constructions of individual opinions, reputations, and tastes provided by these systems. These initiatives have some important parallels with early efforts to support quantitative opinion polling and construct the notion of “public opinion.” The article explores specific ways to increase trust in these systems, albeit a “guarded trust” in which individuals actively seek information about system foibles and analyze the reputations of participants. She received her MBA, MA, MS, and Ph.D. degrees from the University of Wisconsin at Madison. She taught computer information systems and public policy at Baruch College of the City University of New York and also taught in the School of Business and the Computer Sciences Department at UW-Madison. In the 1990s, she served as the chair of the Privacy Council of the State of Wisconsin, the nation’s first state-level council dealing with information technology and privacy issues. She has written several books (including Virtual Individuals, Virtual Groups: Human Dimensions of Groupware and Computer Networking, Cambridge University Press and Home as Information Space: Electronic Commerce and the Domestication of Computer Networking, forthcoming). She has worked for public television and developed software along with her academic ventures.     

A Topological Model of Epistemic Intentionality

Beyond their linguistic and rhetorical uses, the mental epistemic verbs to knowand to believe reveal a basic conceptual system for human intentionality and the theory of representational mind. Numerous studies, particularly in the field of child development, have been devoted to the conditions under which knowledge and belief are acquired. Upstream of this empirical approach, this paper proposes a topological model of the conceptual structure underlying the linguistic use of to know and to believe. A cusp model of catastrophe theory is chosen to model the formation of epistemic states. Its main characteristic is considering to believe as an intermediate state which lacks stability and presents the delayed effect of hysteresis. The attribution of mental states to the other (viewpoint of the third person) is obtained by the crossing of first and third person knowledge and belief, which gives rise to new categories (to know if and to falsely believe) and closes the system. Another merging of the beliefs of persons A and B, using the butterfly catastrophe, provides a model of interpersonal belief appreciated by an independent observer along a potential evolving from agreement to disagreement. This revised version was published online in August 2006 with corrections to the Cover Date.     

Consultant or Comrade: Comments About Analysts' Working Relationships in Schools

The articles in this issue of the Journal of Applied Psychoanalytic Studies pose a dilemma for educators. On the one hand, each article describes an important psychosocial intervention implemented in schools. On the other hand, these interventions, at least as described in the articles, are either imposed on the work of teachers and students or isolated from that work. Either circumstance ultimately limits the impact of the intervention. I claim that analysts and teachers are natural allies despite lack of evidence for alliance in these articles. To extend that alliance beyond conversations about individual children, analysts must understand that teachers' views of learning and development are different from those that influence the organization and management of schools.     

A cortical framework for invariant object categorization and recognition

In this paper we present a new model for invariant object categorization and recognition. It is based on explicit multi-scale features: lines, edges and keypoints are extracted from responses of simple, complex and end-stopped cells in cortical area V1, and keypoints are used to construct saliency maps for Focus-of-Attention. The model is a functional but dichotomous one, because keypoints are employed to model the “where” data stream, with dynamic routing of features from V1 to higher areas to obtain translation, rotation and size invariance, whereas lines and edges are employed in the “what” stream for object categorization and recognition. Furthermore, both the “where” and “what” pathways are dynamic in that information at coarse scales is employed first, after which information at progressively finer scales is added in order to refine the processes, i.e., both the dynamic feature routing and the categorization level. The construction of group and object templates, which are thought to be available in the prefrontal cortex with “what” and “where” components in PF46d and PF46v, is also illustrated. The model was tested in the framework of an integrated and biologically plausible architecture.

CHANGES IN BLOOD PRESSURE AND HEART RATE DURING FIXED‐INTERVAL RESPONDING IN SQUIRREL MONKEYS

Episodic and sustained increases in heart rate and mean arterial blood pressure can occur with recurring patterns of schedule‐controlled behavior. Most previous studies were conducted under fixed‐ratio schedules, which maintained a consistent high rate of responding that alternated with periods of no responding during times when the schedule was not in operation. The present study examined changes in heart rate and blood pressure under fixed‐interval schedules which maintained a range of rates that varied from little or no responding at the beginning of the fixed interval to high rates at the end of the interval. The relations of cardiovascular function to rate of responding were examined. Squirrel monkeys prepared with arterial catheters were trained to respond under fixed‐interval schedules of electric‐shock presentation. The duration of the interval was varied across sessions and cardiovascular parameters were examined. Local rates of responding were typically near zero during timeout periods, low at the beginning of each fixed‐interval cycle, and then increased as the fixed interval progressed. At most schedule durations, arterial blood pressure and heart rate levels were lowest at the beginning of the interval cycles, increased as the rate of responding increased, and then decreased during the timeout periods. At all parameters studied, there was a direct relationship between changes in response rate within fixed‐interval cycles and changes in heart rate and blood pressure. The results suggest that a much closer concordance of these cardiovascular parameters and schedule‐controlled responding is obtained by examining ongoing behavior as it occurs within the contingencies by which it is maintained.     

Lean and mean rats: Some effects of acute changes in the food supply upon territorial aggression

In experiment 1, individually housed rats subjected to short-term food restriction displayed more territorial aggression toward conspecific intruders than controls maintained on a free-feeding diet. In experiment 2, small groups of three adult male rats had access to either a standard laboratory diet or the standard diet plus sucrose. Groups with the sucrose supplement were significantly less aggressive toward intruders than controls. Sucrose availability did not produce appreciable gains in body weight but it did reliably decrease within-colony weight variation. The results suggest the existence of an effective dietary mechanism that enables a social species such as Rattus norvegicus to tolerate each other in dense feeding aggregations when food is abundant. Conversely, when food is limited, social intolerance increases and serves to limit the development of large feeding groups.     

PBCB: A norming of the spanish translation of the Boehm test of Basic Concepts

The Boehm Test of Basic Concepts (BTBC) was designed to measure children's mastery of concepts considered necessary for achievement in the first years of school. The test is group administered, and is appropriate for use with children in the first three grades: kindergarten, first grade, and second grade. The test has been demonstrated to be a valid and reliable measure when administered in English. Prueba Boehm de Conceptos Basicos (PBCB), a Spanish translation of the test, was administered to 1,292 children three times in public and private schools in Puerto Rico during the 1979–1981 school years. Normative information, reported by type of school, by grade, and by time of year tested is presented. The reliability of PBCB was established. The test was shown to have predictive validity as well, correlating with measures of academic achievement one year following the end-of-year administration of the PBCB.     

Research methods for computer applications

This paper identifies issues and techniques useful to psychologists interested in applied research for computer applications. Applied research includes guideline research, product development evaluation, and field trial evaluation. Suggestions for improved guideline research involve screening the problem to determine its potential usefulness and screening the design to make sure it involves sufficiently representative tasks, subjects, and materials for the desired generality. Product development evaluation requires techniques for testing users that are fast, flexible, and inexpensive, such as “user trials” of products in ergonomics and “user edits” for testing documentation. Field trials of office automation or videotex systems lead to decisions about further introduction of those systems. A methodology for planning the research component of field trials, “evaluation assessment,” provides a set of steps to use in deciding which design and measures should be collected.