Similarity as an organising principle in short-term memory

Abstract

The role of stimulus similarity as an organising principle in short-term memory was explored in a series of seven experiments. Each experiment involved the presentation of a short sequence of items that were drawn from two distinct physical classes and arranged such that item class changed after every second item. Following presentation, one item was re-presented as a probe for the ‘target’ item that had directly followed it in the sequence. Memory for the sequence was considered organised by class if probability of recall was higher when the probe and target were from the same class than when they were from different classes. Such organisation was found when one class was auditory and the other was visual (spoken vs. written words, and sounds vs. pictures). It was also found when both classes were auditory (words spoken in a male voice vs. words spoken in a female voice) and when both classes were visual (digits shown in one location vs. digits shown in another). It is concluded that short-term memory can be organised on the basis of sensory modality and on the basis of certain features within both the auditory and visual modalities.     

The effects of feature-label-order and their implications for symbolic learning

Symbols enable people to organize and communicate about the world. However, the ways in which symbolic knowledge is learned and then represented in the mind are poorly understood. We present a formal analysis of symbolic learning-in particular, word learning-in terms of prediction and cue competition, and we consider two possible ways in which symbols might be learned: by learning to predict a label from the features of objects and events in the world, and by learning to predict features from a label. This analysis predicts significant differences in symbolic learning depending on the sequencing of objects and labels. We report a computational simulation and two human experiments that confirm these differences, revealing the existence of Feature-Label-Ordering effects in learning. Discrimination learning is facilitated when objects predict labels, but not when labels predict objects. Our results and analysis suggest that the semantic categories people use to understand and communicate about the world can only be learned if labels are predicted from objects. We discuss the implications of this for our understanding of the nature of language and symbolic thought, and in particular, for theories of reference.     

An analysis of the relationship of teachers' reported use of classroom management strategies on types of classroom interactions

The results of an investigation to determine teachers' reported use of classroom management strategies and their relationship to teacher and student interactions are presented. We interviewed 20 teachers to determine how they developed and used classroom management strategies, and then observed the interactions of these teachers with children with serious behavior disorders (SBD). Results identified two groups of teachers: one that scored high on planned use of the strategies, and one that scored low. Comparisons between the two groups of the interaction patterns revealed small, but statistically significant differences in the mean length and total percent time involved in positive interactions. The group reporting higher use of the management strategies engaged in positive interactions which were longer in duration than the interactions of the group reporting lower use. The results are discussed in terms of further research needs and implications for teacher training programs.     

A theory of intelligence: II. The role of span in a variety of intellectual tasks

This paper is the sequel to Part I in which a theory of intelligence was developed in terms of the concepts of span ability and complex stimulus control. A broad range of topics is discussed including discrimination learning, language, language development, reading, the relation between intelligence and learning, task analysis and the training of the mentally retarded, the role of span in IQ subtests, and suggestions for research. The paper includes summaries of previously unpublished research by the first author as well as published work by other investigators.     

An irrelevant speech effect with repeated and continuous background speech

The irrelevant speech effect is the impairment of task performance by the presentation of to-be-ignored speech stimuli. Typically, the irrelevant speech comprises a variety of sounds, but previous research (e.g., Jones, Madden, & Miles, 1992) has suggested that the deleterious effect of background speech is virtually eliminated if the speech comprises repetitions of a sound (e.g., “be, be, be”) or a single continuous sound (e.g., “beeeeeee”). Four experiments are reported that challenge this finding. Experiments 1, 2, and 4 show a substantial impairment in serial recall performance in the presence of a repeated sound, and Experiments 3 and 4 show a similar impairment of serial recall in the presence of a continuous sound. The relevance of these findings to several explanations of the irrelevant speech effect is discussed.