Memory in educable mentally retarded adults: Deficit in subject or experimenter?

Educable mentally retarded (EMR) and nonretarded adults free recalled lists of (a) words, (b) minitasks performed by the subjects (SPTs), (c) minitasks performed by the experimenter (EPTs), or (d) task instructions. The EMR subjects were significantly inferior to the nonretarded subjects in the immediate recall of words, EPTs and instructions, but not in the immediate recall of SPTs. This proficiency of the EMR subjects in SPT recall was attributed to the nonstrategic nature of this test. The EMR subjects were, however, inferior to the nonretarded subjects in a final free recall (recall of all lists) of all four types of item.     

Individual differences in the ability to focus and divide attention

This research deals with individual differences in the ability to focus and divide attention. Eighty-five subjects performed visual search and auditory detection tasks in three conditions: single channel, focused attention, and divided attention. Reaction time (RT) was fastest in the single channel condition, intermediate in the focused attention condition, and longest in the divided attention condition, and these effects were much stronger in the auditory than the visual task. Correlations among RTs in the three conditions were very high within modality (>.88), and lower between modalities (.5 to .6). The correlational data was well fit by a model that included separate factors for the visual and auditory tasks. Measures from the three attentional conditions within each modality loaded equally on these factors. The data provided no evidence for distinct abilities to divide or focus attention.     

Sex differences in symbol-digit substitution and speeded matching

Sex differences in digit-symbol substitution and speeded matching tests have not been adequately explained. Recent attempts have suggested the importance of the comparison processes, associative memory, and a possible difference in processing verbal and spatial information. Four experiments, two on speeded matching and two on symbol-digit substitution, supported the hypothesis that both tests involve comparison processes and that the sex difference in these processes depends upon the type of information. A female advantage is clearest with verbal material on both matching and symbol-digit substitution tasks. A male advantage was found on a symbol-digit substitution test only after training on the symbol-digit associations and when symbol discrimination involved spatial orientation. These results question previous interpretations of the clerical speed and symbol-digit substitution tests in terms of perceptual encoding speed, attentional shifts or sex differences in motor skills.     

Characteristics of consultants and consultees and success in mental health consultation

Selected attitudinal and value characteristics of high and low successful consultants were considered. Twelve consultants and 15 consultees completed six measures. Consultants were categorized as high or low success consultants based on the coding of consultants' logs. Results indicate high and low success consultants do not differ on the selected characteristics. Also, the results indicate that more successful consultants have consultees who are more authoritarian and dogmatic and are more dissimilar to their consultees in level of dogmatism and reported need for assistance. Future investigations will indicate whether the results can be replicated on a more representative consultee sample.     

Short-term memory deficits in reading disabled children,in the absence of opportunity for rehearsal strategies

Two groups of reading-disabled (RD) children were compared with controls (age- and IQ-matched competent readers), on a serial running memory task. The unknown (to the subject) length of the serial lists coupled with high rates of presentation, made it impossible for the children to use systematic rehearsal strategies in this task. Both groups of RD children performed reliably worse than their controls. From the data, it is argued that the short-term memory deficits exhibited by the RD children should not be attributed to an inability to rehearse, nor to an inability to encode (recognize) items, but rather to an inability to encode serial items in the form of serial phonological patterns.     

Training research in aging on the fluid ability of inductive reasoning

The modifiability of older adults' performance on Induction tasks was examined through cognitive training. The posttraining performance of 52 older adults ($\text{X}\text{age = 70.3}\text{years}$) was assessed with regard to a transfer-of-training paradigm and maintenance of training effects at three posttests (one week, one month, six months). A pattern of differential training transfer across the posttest battery of fluid and crystallized intelligence measures was predicted, with the largest training effects expected for near transfer (Induction) measures. The predicted pattern of training transfer was obtained at one-week and one-month posttests, with significant training effects to the nearest Induction measure. Large retest (practice) effects across posttests also occurred for training and control groups. This research contributes to the position that modifiability of intellectual performance through cognitive intervention extends across the adult life span.     

Thorndike's Legacy: Learning, Selection, And The Law Of Effect

This introduction to a symposium on the centennial of Edward L. Thorndike's 1898 monograph on animal intelligence briefly considers the origins of his law of effect and the influence of Darwin's selectionism. It also provides the background for an unfinished book review by William W. Cumming of a biography of Thorndike. The review places in historical context Thorndike's position both on psychology as a science of behavior and on the vocabulary of that science.     

After the puzzle boxes: thorndike in the 20th century

From the beginning of this century, following the publication of his dissertation, Thorndike made many significant contributions to psychology, some related to animal and human learning and others to various areas of educational psychology. This paper concentrates on the former and mentions some of the latter, in the context of personal and professional aspects of his life.