Effects of semantic and nonsemantic cued orienting tasks on associative clustering in free recall

Memory & Cognition - During presentation of a randomized list of nonadjacent associative pairs, Ss heard a cue after each word designating the task to be performed. All Ss performed two tasks....     

The effects of atropine on viscerovisceral reactions and the electrocardiogram of the cat

In 12 chronic cats the effects of mechanical stimulation (distention) of the gallbladder on heart rate, respiratory movements and bioelectrical activity of the cerebral cortex were studied under normal conditions and after intraperitoneal administration of atropine. In the control group without atropine a decrease or an increase of heart rate and of respiratory movements occurred, depending on stimulation intensity. These changes were independent of an activated or inactivated EKG. Behavioral arousal was not seen in every cat. After administration of atropine in doses from 0.2 to 2.0 mg per kg body weight, the changes in heart rate, respiration and EKG were suppressed or completely disappeared.     

Visual neglect in the first weeks after a stroke in the right hemisphere

The aim of the study was to characterize symptoms of visual neglect among patients who recently survived a stroke in the right hemisphere (RH), and to contribute to the understanding of change in symptoms during the first months after a RH stroke. Thirteen patients with a RH stroke and twenty controls were assessed by using standard neglect tests. Five patients were followed up by repetitive test sessions during the next four months. To assess more subtle symptoms, reaction-time (RT) measures derived from an experimental cue-target paradigm were included in the final test session. A high frequency of neglect symptoms was documented at the first test session. The changes in performance during the first weeks were characterized by a high inter-individual as well as a high intra-individual variability. Although the remission rate on standard tests was high in the follow-up study, the RT measures indicated sustained symptoms of visual extinction in all patients. The long-term implication of the changes of neglect symptoms during the first weeks after a stroke and signs of sustained symptoms of visual extinction calls for further longitudinal studies including a larger group of patients.     

Is there really very rapid forgetting from primary memory? The role of expectancy and item importance in short-term recall

In two experiments, subjects recalled one of two letter segments following a digit-filled retention interval. In Experiment 1, recall expectancy was manipulated by using precues that correctly informed or misinformed subjects concerning which letter segment wou;d be tested for recall. In Experiment 2, item importance was varied by precuing one segment as important but requiring that the uncued segment be recalled first. Recall performance was very low under conditions of low expectancy and low segment importance, but the slopes of the retention-functions did not demonstrate more rapid forgetting than under standard -conditions. The previous observations of very rapid forgetting from primary memory may be a function of an elevated initial recall level in the earlier studies. Our retention functions were compared with predictions of the Estes perturbation model. The findings suggested that when secondary memory processes were reduced, forgetting order information from primary memory occurred at the same rate as that estimated on the basis of previous studies using the standard distractor task.     

CECoS: A case experience combination system for knowledge acquisition for expert systems

This paper presents a new knowledge-acquisition system—the Case Experience Combination System (CECoS). With CECoS, two information or knowledge sources are jointly analyzed. Previously recorded problem solutions (individual cases) are combined with an expert’s high-level understanding of the global structure of a task domain. By combining the detailed case information with an expert’s general insights, CECoS provides the domain knowledge with which skeletal plans can be automatically constructed.     

A comparison of stimulus set size on tact training for children with autism spectrum disorder

Previous studies on skill acquisition have taught targets in stimulus sets composed of different numbers of stimuli. Although the rationale for selection of a stimulus set size is not clear, the number of target stimuli trained within a set is a treatment decision for which there is limited empirical support. The current investigation compared the efficiency of tact training in 4 stimulus set sizes, each of which included 12 stimuli grouped into (a) 4 sets of 3 stimuli, (b) 3 sets of 4 stimuli, (c) 2 sets of 6 stimuli, and (d) 1 set of 12 stimuli. Results of all 4 participants with autism spectrum disorder show tact training with larger (i.e., 6 and 12) stimulus set sizes was more efficient than training with smaller (i.e., 3 and 4) stimulus set sizes.     

Analysis of haptic perception of materials by multidimensional scaling and physical measurements of roughness and compressibility

In this paper, results of a free sorting task of 124 different material samples are analysed using multidimensional scaling. The relevant number of dimensions for haptic perception of materials is estimated to be 4. In addition, the haptic material space is calibrated by means of physical measurements of compressibility and roughness. The relation between objective and perceived compressibility and that between objective and perceived roughness could be described by an exponential function.     

Is Klein an infinitist about doxastic justification?

This paper is a response to Peter Klein's “Human Knowledge and the Infinite Progress of Reasoning” (also in this issue of this journal). After briefly discussing what Klein says about the requirement, for doxastic justification, that a belief be formed in the right way, I'll make the following three points: Klein's solution to the regress problem isn't an infinitist solution, Klein's position on doxastic justification faces a troubling dilemma, and Klein's objection to foundationalism fails.