Unsafe Assertions

John Turri has recently provided two problem cases for the knowledge account of assertion (KAA) to argue for the express knowledge account of assertion (EKAA). We defend KAA by explaining away the intuitions about the problem cases and by showing that our explanation is theoretically superior to EKAA.     

Can students evaluate their understanding of cause-and-effect relations? The effects of diagram completion on monitoring accuracy

For effective self-regulated study of expository texts, it is crucial that learners can accurately monitor their understanding of cause-and-effect relations. This study aimed to improve adolescents' monitoring accuracy using a diagram completion task. Participants read six texts, predicted performance, selected texts for restudy, and were tested for comprehension. Three groups were compared, in which learners either completed causal diagrams immediately after reading, completed them after a delay, or received no-diagram control instructions. Accuracy of predictions of performance was highest for learning of causal relations following delayed diagram completion. Completing delayed diagrams focused learners specifically on their learning of causal relations, so this task did not improve monitoring of learning of factual information. When selecting texts for restudy, the participants followed their predictions of performance to the same degree, regardless of monitoring accuracy. Fine-grained analyses also showed that, when completing delayed diagrams, learners based judgments on diagnostic cues that indicated actual understanding of connections between events in the text. Most important, delayed diagram completion can improve adolescents' ability to monitor their learning of cause-and-effect relations.     

Curved movement paths and the Hering illusion: Positions or directions?

When trying to move in a straight line to a target, participants produce movement paths that are slightly (but systematically) curved. Is this because perceived space is curved, or because the direction to the target is systematically misjudged? We used a simple model to investigate whether continuous use of an incorrect judgement of the direction to the target could explain the curvature. The model predicted the asymmetries that were found experimentally when moving across a background of radiating lines (the Hering illusion). The magnitude of the curvature in participants' movements was correlated with their sensitivity to the illusion when judging a moving dot's path, but not with their sensitivity when judging the straightness of a line. We conclude that a misjudgement of direction causes participants to perceive a straight path of a moving dot as curved and to produce curved movement paths.     

Organizational change in health care: A strategic perspective please!

Abstract

Commentary on “Making Sense of “Resistance”: Responses to Organizational Change in a Private Nursing Home for the Elderly” by C. Meston and N. King     

Control Options in Managing Strategic Decision-making Processes

Abstract

Top decision making processes are generally depicted as chaotic, unstructured, incremental or spasmodic, and protracted. In this article it is shown, based on data from 25 strategic decision processes from 12 organizations in three industry sectors, that, within certain limits, there certainly are control options in strategic decision-making processes. In addition, their use tums out to be profitable. The analyses of patterns in the use of control dimensions in the 25 cases leads to a typology of four types of decision models or strategies: the neo-rational model (n = 3), the bureaucratic model (n = 4), the arena model (n = 8) and the open-end model (n = 10). This empirical typology confirms earlier typologies based on literature.

The use of control strategies is shown to vary across industry sectors and topics of decisions and have adifferential effect. It is concluded that context and content variables have either a selection effect (some strategies do not occur in some sectors) or a optimization effect (some strategies are more effective than others in a given context).     

10 years of illusions

A decade ago, S. Aglioti, J. F. X. DeSouza, and M. A. Goodale (1995) published an experiment that has had a big influence on the way that visual information is thought to control human behavior. Their findings have often been simplified as suggesting that action is immune to perceptual illusions. The current authors critically analyze the 4 steps involved in this simplification and argue that research during the last 10 years has shown that the validity of 3 of the 4 steps is doubtful. They conclude that this experiment cannot be regarded as firm support for the 2-visual-systems hypothesis (i.e., that the ventral stream is for perception and the dorsal stream is for visually guided actions).     

Depth perception by the active observer

The connection between perception and action has classically been studied in one direction only: the effect of perception on subsequent action. Although our actions can modify our perceptions externally, by modifying the world or our view of it, it has recently become clear that even without this external feedback the preparation and execution of a variety of motor actions can have an effect on three-dimensional perceptual processes. Here, we review the ways in which an observer's motor actions--locomotion, head and eye movements, and object manipulation--affect his or her perception and representation of three-dimensional objects and space. Allowing observers to act can drastically change the way they perceive the third dimension, as well as how scientists view depth perception.     

Job control and burnout across occupations

Researchers have reported that, for individual workers, low job control is associated with high burnout; however, as yet it is unclear whether this association holds for occupations as well. Whether differences in job control between occupations as assessed by eight expert judges could account for individual-level and occupational-level differences in burnout rates. Data were obtained from 9,503 incumbents of 28 occupations in The Netherlands (M age = 37.9 yr., SD = 8.7; 50% were men). Burnout was measured on the Maslach Burnout Inventory. Occupational-level job control was inversely correlated with burnout, explaining 16% of the variation in occupational-level burnout. Thus, between-occupation differences in job control are somewhat systematically related to burnout.     

Sustained conscious access to incidental memories in RSVP

In visual search of natural scenes, differentiation of briefly fixated but task-irrelevant distractor items from incidental memory is often comparable to explicit memorization. However, many characteristics of incidental memory remain unclear, including the capacity for its conscious retrieval. Here, we examined incidental memory for faces in either upright or inverted orientation using Rapid Serial Visual Presentation (RSVP). Subjects were instructed to detect a target face in a sequence of 8–15 faces cropped from natural scene photographs (Experiment 1). If the target face was identified within a brief time window, the subject proceeded to an incidental memory task. Here, subjects used incidental memory to discriminate between a probe face (a distractor in the RSVP stream) and a novel, foil face. In Experiment 2 we reduced scene-related semantic coherency by intermixing faces from multiple scenes and contrasted incidental memory with explicit memory, a condition where subjects actively memorized each face from the sequence without searching for a target. In both experiments, we measured objective performance (Type 1 AUC) and metacognitive accuracy (Type 2 AUC), revealing sustained and consciously accessible incidental memory for upright and inverted faces. In novel analyses of face categories, we examined whether accuracy or metacognitive judgments are affected by shared semantic features (i.e., similarity in gender, race, age). Similarity enhanced the accuracy of incidental memory discriminations but did not influence metacognition. We conclude that incidental memory is sustained and consciously accessible, is not reliant on scene contexts, and is not enhanced by explicit memorization.     

Can false memories be created through nonconscious processes?

Presentation times of study words presented in the Deese/Roediger and McDermott (DRM) paradigm varied from 20 to 2000 ms per word in an attempt to replicate the false memory effect following extremely short presentations reported by. Both in a within-subjects design (Experiment 1) and in a between-subjects design (Experiment 2) subjects showed memory for studied words as well as a false memory effect for related critical lures in the 2000-ms condition. However, in the conditions with shorter presentation times (20 ms in Experiment 1; 20 and 40 ms in Experiment 2) no memory for studied words, nor a false memory effect was found. We argue that there is at present no strong evidence supporting the claim for a nonconscious basis of the false memory effect.