Human Decisions in Moral Dilemmas are Largely Described by Utilitarianism: Virtual Car Driving Study Provides Guidelines for Autonomous Driving Vehicles

Science and Engineering Ethics - Ethical thought experiments such as the trolley dilemma have been investigated extensively in the past, showing that humans act in utilitarian ways, trying to cause...     

Strategy development and learning differences in supervised and unsupervised categorization

The processes that determine unsupervised categorization, the task of classifying stimuli without guidance or feedback, are poorly understood. Two experiments examined the emergence and plasticity of unsupervised strategies using perceptual stimuli that varied along two separable dimensions. In the first experiment, participants either classified stimuli into any two categories of their choice or learned identical classifications by supervised categorization. Irrespective of the complexity of classification, supervised and unsupervised learning rates differed little when both modes of learning were maximally comparable. The second experiment examined the plasticity of unsupervised classifications by introducing novel stimuli halfway through training. Whether or not people altered their strategies, they responded to novel stimuli in a gradual manner. The gradual and continuous evolution and adaptation of strategies suggests that unsupervised categorization involves true learning which shares many properties of supervised category learning. We also show that the choice of unsupervised strategy cannot be predicted from the properties of early learning trials, but is best understood as a function of the initial distribution of dimensional attention.     

The magnitude of binocular disparity modulates search time for targets defined by a conjunction of depth and colour

Nakayama and Silverman (1986) proposed that, when searching for a target defined by a conjunction of color and stereoscopic depth, observers partition 3D space into separate depth planes and then rapidly search each such plane in turn, thereby turning a conjunctive search into a "feature" search. In their study, they found, consistent with their hypothesis, shallow search slopes when searching depth planes separated by large binocular disparities. Here, the authors investigated whether the search slope depends upon the extent of the stereoscopically induced separation between the planes to be searched (i.e., upon the magnitude of the binocular disparity. The obtained slope shows that (1) a rapid search only occurs with disparities greater than 6 min of arc, a value that vastly exceeds the stereo threshold, and that (2) the steepness of this slope increases in a major way at lower disparities. The ability to implement the search mode envisaged by Nakayama and Silverman is thus clearly limited to large disparities; less efficient search strategies are mandated by lower disparity values, as under such conditions items from one depth plane may be more likely to "intrude" upon the other. (PsycINFO Database Record (c) 2008 APA, all rights reserved).     

Effects of Personality Characteristics on Knowledge,Skill, and Performance in Servicing Retail Customers

This study tested the idea that some personality variables are related to interpersonal aspects of job performance primarily through interpersonal knowledge and skill, just as cognitive ability has been shown to be related to technical aspects of job performance primarily through technical knowledge and skill. We measured personality factors, cognitive ability, customer service knowledge (through a structured interview), customer service skill (through role‐play simulations), and customer service performance (through supervisory ratings) in a sample of 140 retail store associates. As expected, results showed that interpersonally oriented personality characteristics are related to customer service knowledge even when effects of ability, conscientiousness, and experience are taken into account, and that customer service knowledge and skill together carry the indirect effects of personality characteristics, ability, and experience to customer service performance. We also found that conscientiousness moderates the relation between knowledge and performance such that knowledge predicts performance best for people who are highly conscientious.     

Fokale psychodynamische Psychotherapie der Anorexia nervosa

The paper presents a manual for the focal psychodynamic psychotherapy of anorexia nervosa (AN). The manual was developed in the context of the largest randomized controlled trial of outpatient psychotherapy for AN so far [Anorexia Nervosa Treatment of OutPatients (ANTOP), n=234]. The study compares focal psychodynamic psychotherapy with cognitive-behavioral therapy and with a control group with free choice of therapy outside the study. The manual comprises instructions for the working through of typical focal emotional and interpersonal issues of AN. Also recommendations for anorexia-specific therapeutic difficulties in the course of treatment are given. First results concerning the efficacy of the therapies carried out based on the manual are expected after completion of the ANTOP study in the middle of the year 2010.     

Coordination of complex bimanual multijoint movements under increasing cycling frequencies: The prevalence of mirror-image and translational symmetry

The present study examined the principles underlying inter and intralimb coordination constraints during performance of bimanual elbow–wrist movements at different cycling frequencies (from 0.75 Hz to 2.50 Hz). Participants performed eight coordination tasks that consisted of a combination of in-phase (IN) and/or anti-phase (AN) coordination modes between both elbows and wrists (interlimb), with isodirectional (Iso) or non-isodirectional (NonI) coordination modes within each limb (intralimb). As expected, the principle of muscle homology (in-phase coordination), giving rise to mirror symmetrical movements with respect to the mid-sagittal plane, had a powerful influence on the quality of global coordinative behavior both between and within limbs. When this principle was violated (i.e., when the anti-phase mode was introduced in one or both joint pairs), the non-isodirectional intralimb mode exhibited a (de)stabilizing role in coordination, which became more pronounced at higher cycling frequencies. However, pattern loss with increasing cycling frequency resulted not only in convergence toward the more stable in-phase patterns with the elbows and wrists but also to the anti-phase patterns (which were associated with directional compatibility of within-limb motions). Moreover, participants generally preserved their initial mode of coordination (either in-phase or anti-phase) in the proximal joints (i.e., elbows) while shifting from anti-phase to in-phase (or vice versa) with their distal joint pair (i.e., wrists). Taken together, these findings reflect the impact of two immanent types of symmetry in bimanual coordination: mirror-image and translational symmetry.     

Traveling economically through memory space: Characterizing output order in memory for serial order

How do people report the contents of short-term memory when information about order must be retained but items can be retrieved in any order? We report an experiment using an unconstrained reconstruction task in which people can report list items in any order but must place them in their correct serial positions. We found (1) a tendency to report recent items first in immediate but not in delayed reconstruction, (2) a tendency to recall temporally isolated items first, (3) a preference for forward recall order, and (4) a preference for output orders that minimize the length of the path that must be traversed through memory space during retrieval. The results constrain most current models of short-term memory in which retrieval is ballistic and is assumed to run to completion autonomously once initiated.     

The Wisdom of Individuals: Exploring People's Knowledge About Everyday Events Using Iterated Learning

Determining the knowledge that guides human judgments is fundamental to understanding how people reason, make decisions, and form predictions. We use an experimental procedure called 'iterated learning,' in which the responses that people give on one trial are used to generate the data they see on the next, to pinpoint the knowledge that informs people's predictions about everyday events (e.g., predicting the total box office gross of a movie from its current take). In particular, we use this method to discriminate between two models of human judgments: a simple Bayesian model ( Griffiths & Tenenbaum, 2006 ) and a recently proposed alternative model that assumes people store only a few instances of each type of event in memory (Min K ; Mozer, Pashler, & Homaei, 2008 ). Although testing these models using standard experimental procedures is difficult due to differences in the number of free parameters and the need to make assumptions about the knowledge of individual learners, we show that the two models make very different predictions about the outcome of iterated learning. The results of an experiment using this methodology provide a rich picture of how much people know about the distributions of everyday quantities, and they are inconsistent with the predictions of the Min K model. The results suggest that accurate predictions about everyday events reflect relatively sophisticated knowledge on the part of individuals.     

Measuring Procedural Knowledge More Simply with a Single-Response Situational Judgment Test

Purpose  This paper describes the development of a situational judgment test (SJT) based on single-response options developed directly from critical incidents and reports a study that tested the SJT’s concurrent validity against ratings of job performance. Design/Methodology/Approach  Situational judgment test items were developed from critical incidents provided by administrators of volunteer agencies. Volunteers who worked at another agency completed the SJT and a self-report personality test. Supervisors rated their job performance on three dimensions. Findings  Situational judgment test scores representing procedural knowledge about work effort were significantly correlated with ratings of work effort performance (r = .28). Conscientiousness was correlated with work effort knowledge (r = .26), but not with work effort performance (r = −.02). Implications  These results provide some preliminary evidence that a single-response SJT format based upon critical incidents can produce valid measures of procedural knowledge and might be a useful alternative to the traditional multiple-response format. Originality/Value  This paper presents a novel way to construct SJTs using single-response options that are less laborious to develop than the multiple-response options in traditional SJT formats. Results of the validity study suggest that this new single-response format can predict job performance and encourage further research on the viability of this approach.