Selective looking: Attending to visually specified events

Subjects looked at two optically superimposed video sccreens, on which two different kinds of things were happening. In the principal condition, they were required to follow the action in one episode (by pressing keys when significant events occurred) and ignore the other. They could do this without difficulty, although both were present in the same fully overlapped visual field. Odd events in the unattended episode were rarely noticed. It was very difficult to monitor both episodes at once. Performance was no better when the two episodes were presented to different eyes (dichoptic condition) than when both were given binocularly. It is argued that selective attention does not involve special mechanisms to reject unwanted information, but is a direct consequence of skilled perceiving.     

Stimulus intrusion on fixed-interval responding in the rat: The effects of electric shock intensity,temporal location,and response contingency

After a scalloped lever-press response pattern had developed under a fixed-interval food reinforcement schedule, a 15-sec electric shock was intruded for different groups of rats in the first, second, third, or fourth quarter of each inter-reinforcement interval. Shock intensity was systematically increased for individual rats over 70 sessions, from 0.05 to 1.6 mA. Additional between-groups comparisons involved response-dependent versus clock-dependent fixed-interval schedules, and response-dependent versus response-independent electric shock intrusion. Response rates within each fixed interval prior to, during, and following electric shock intrusion showed regular and reproducible increases and decreases under systematic application of the experimental variables. These results provide further evidence that the functions of a stimulus are determined in part by the parameters of intensity, response contingency, and temporal location with respect to reinforcement.     

Differences among medical,business, and engineering students in the intensity and direction of their affective responses to occupational concepts

A semantic differential was used to measure the affective responses of vocationally committed male students in medicine, business, and engineering to occupational concepts representing the fields of medicine, business, engineering, the clergy, and law enforcement. A factor analysis of the data indicated that the students responded to the concepts with the Evaluative, Activity, and Potency dimensions of affective meaning. It was found that the groups differed significantly in the intensity and direction of their affective responses to the occupational concepts on the Evaluative and Activity dimensions. An examination of the nature of the group differences indicated that they held different affective meanings for their respective vocational choices, and for other occupational concepts as well. The medical students responded to medicine as good, potent, and active; the business students to business as bad, potent, and active, and the engineering students to engineering as good, weak, and active. The possible relationship of affective meaning to vocational behavior was discussed.     

Infants' intermodal perception of events

Four-month-old infants viewed two sound motion picture films of simple, natural events. The films were projected side by side, as one of the two sound tracks was played through a centrally placed speaker. Infants' visual attention to the films was consistently influenced by what they heard: They looked primarily at the event specified by the sound track. The experiment demonstrates that infants are able to perceive relations between sights and sounds in the absence of spatial cues. They respond to a perceived intermodal invariance with increased attention to the event reaching them over two modalities.     

Infant visual fixation: The effect of concentricity,curvilinearity, and number of directions

The goal of the study was to define certain of the effective dimensions of visual stimulation in the infant's visual environment by analyzing the well-documented preference for the bullseye over a pattern of horizontal stripes. The stimuli were ten black and white patterns, including the bullseye and the stripes, designed to vary along three dimensions: concentricity, curvilinearity and number of directions within the stimulus. The dependent measure was total fixation time corrected for position bias. The subects, 18 three-month-old infants, were tested three times each in order to present them with the ten stimuli in all possible combinations with positions reversed.All three dimensions were found to be effective in varying degrees. The results were discussed in terms of underlying mechanisms and the infant's ability to process information from a multidimensional stimulus.     

Nature of spelling errors in transcortical sensory aphasia: A case study

The nature and extent of spelling errors in a patient with transcortical sensory aphasia were investigated. The two experimental conditions required the patient to spell monosyllabic and polysyllabic words both verbally and in written form. Analysis of the spelling errors revealed partially preserved knowledge of the visual image of a word as a whole, as well as preserved knowledge of temporal order. Our patient's error patterns in both conditions were more similar than dissimilar. These findings in conjunction with results reported in the literature indicate that patients exhibiting different aphasia syndromes use separate spelling strategies.     

A comparison of the Probe technique and conventional therapy for young stutterers

This study contrasted the gains made in speech theraphy by 39 stutterers, 15 of whom were treated by conventional methods and 24 by the Probe technique. It was found that the Probe technique yielded substantially greater gains in fluency than did the conventional method, having more influence on final performance than factors such as initial fluency, time since onset of stuttering, or the presence of other unacceptable behaviors.     

Convergence between attention variables and factors of psychometric intelligence in older adults

The purpose of the present study was to examine the hypothesis that individual differences on measures of attention would converge with select factors of psychometric intelligence, especially fluid intelligence and short-term acquisition and retrieval. A sample of 83 elderly adults $\text{(}\text{X}\text{= 71}\text{years}\text{)}$ was administered a battery of 17 psychometric ability tests. Tests were selected to mark four psychometric ability factors (Cattell and Horn's dimensions of fluid and crystallized intelligence, short-term acquisition and retrieval, and perceptual speed). Also, seven tasks representing four aspects of attention—decoding processes, selective attention, attention switching, and concentration—were administered. A confirmatory factor analysis was conducted to examine the relationships among the four psychometric ability factors and 11 variables obtained from the attention tasks. Results were only partially consistent with the hypothesized pattern of convergence. Two attention measures had significant loadings on a fluid-type intelligence factor, and one had a marginally significant loading on a short-term memory factor. In general, the greatest convergence occured between attention variables and the ability factor of Perceptual Speed. Results were discussed with respect to previous research on psychometric abilities and cognitive processes, the theory of fluid-crystallized intelligence, and their implications for understanding intellectual aging.     

The effect of instructions to organize for good and poor learners

Two studies are reported which investigate the possibility that instructing individuals to organize their recall will differentially facilitate the performance of “fast” and “slow” learners (defined in terms of performance on a pretest). Experiment I utilized alphabetic organization in the free-recall learning of a list of unrelated words; Experiment II used a categorized word list under similar conditions. In each study, half of the individuals in each ability group received instructions, prior to the first of six learning trials, that contained information about the respective nature of organization present in the list and encouragement to use this type of organization in learning the list. In Experiment I, instructions to use alphabetic organization facilitated the performance of both ability groups to about the same extent. In Experiment II, instructions to use categorical organization in learning resulted in a substantial facilitation of performance for “slow” learners and a slight decrement in performance for “fast” learners. The results from the two studies are discussed in terms of sources of individual differences in learning.