Attention as a predictor of learning in infants

A total of 240 fourteen-week-olds were rewarded with a pattern of lights and tones for kicking. The reward display interrupted a background of random alternation between two lights and tones. In experiment 1, attention to this background stimulus during a 1-min baseline was assessed using the number of fixations of alternating lights. During 6 min of reward, high-attention subjects showed significantly greater changes in kicking rate from baseline than low-attention subjects. In experiment 2, the proportion of subjects with low attention ratings increased dramatically during an extended 5-min baseline period, and those subjects with low attention ratings at the end of baseline did not show an increase in kicking from baseline to the reward phase, while high-attention subjects did show evidence of learning. Thus, an objective measure of attention, empirically separate from the dependent learning measure, provided a significant prediction of the effectiveness of subsequent reinforcement, and could be manipulated simply by extending the baseline by as little as 4 min.     

Emotional mood and memory in young children

Two experiments examined affect-dependent memory with preschool/kindergarten and third-grade children. A two-list intentional learning procedure was used to assess the effects of the congruent versus incongruent relationship between affect (happy vs sad) during initial list learning and affect (happy vs sad) during a delayed recall test. When induction of emotional mood was preceded by relaxation exercises in Experiment 1, no evidence of affect dependence was observed. When the relaxation procedure was omitted in Experiment 2, the affect-dependent pattern was obtained in both free recall and cued recall for both age groups. The results of Experiment 2 show that affect-dependent memory is a reasonably robust phenomenon in children and that hypnosis is not necessary for its appearance. However, the phenomenon is apparently absent under conditions of relaxation, a result consistent with two-factor theories of emotion.     

Event knowledge,elaborative propensity,and the development of learning proficiency

An experimental test was made of two hypotheses formulated to account for age differences across adolescence in the learning of arbitrary associations. One hypothesis ascribes such differences to two factors: the propensity to elaborate coherent relationships among initially disparate items, and accessibility to event knowledge that can form the bases of such relationships. The other hypothesis assumes that propensity remains constant across age, and that development stems entirely from increases in the accessibility of relevant event knowledge. These hypotheses are evaluated with reference to the performance of 11- and 17-year-olds in learning relationships among paired nouns. The results discredited both hypotheses, instigating the formulation of a revised conception of the relationship between knowledge and propensity as developmental determinants.     

Children's understanding of food and its functions: A preliminary study of the development of concepts of nutrition

Children's developing conceptions of how the body functions nutritionally were examined. Two different tasks provided converging findings. One task asked children to judge the causes of certain end states (e.g., why X is fat). The second task asked children to judge the result of certain contrasting diets (e.g., twin-1 eats twice as much candy as twin-2). The results evidenced; (a) systematic misconceptions on the part of kindergarteners that were overcome by sixth grade; and (b) other fairly sophisticated conceptions present even at the youngest ages tested. The research provides a needed first step toward describing the naive theories of nutrition possessed by children at different ages. Knowledge of childrens' theories of nutrition are essential for optimal planning of curricula and methods in nutrition education.     

The effects of interpersonal skills training on sex-role identity of premarital dating partners

The purpose of the present study was to assess the effects of a problem-solving skills training program on sex-role identity. It was hypothesized that individuals in a problem-solving skills training program would show greater movement toward androgyny relative to a control group. Twenty-six premarital couples were assigned to a problem-solving skills training program and 29 couples served as a contact control group. An analysis of covariance was performed on the Bem Scale masculine and feminine scores to test the effects of group and sex. Results indicated that the experimental group, as compared to the control group, was significantly higher on femininity following treatment. Discussion centered on the implications of being able to change sex-role identity as well as the need to further explore means of facilitating the development of androgyny in adults.     

Reaction time,evoked brain potentials,and psychometric g in the severely retarded

Measurements derived from reaction time (RT), movement time (MT), and an index of neural adaptability (NA) derived from averaged evoked potentials are significantly related to each other as well as to g factor scores extracted from a battery of 15 psychometric tests in a sample of 54 severely retarded adults. The RT-MT and NA variables show a shrunken multiple R of .64 (p < .001) with psychometric g.     

An experimental analysis of impulsivity and impulse control in humans

In choosing between small, immediate and large, delayed reward, an organism behaves impulsively if it chooses the small reward and shows impulse control if it chooses the large reward. Work with nonhumans suggests that impulsivity and impulse control may be derived from gradients of delayed reinforcement. A model developed by Ainslie and by Rachlin suggests that preference for the rewards should be a function of when the choice is made: small reward with no delay may be preferred to large reward with delay X, but adding delay T to both alternatives should shift preference to the large reward. Three experiments investigated this preference reversal in humans, using termination of 90 dba white noise as the reinforcing event. Experiment 1 showed that under some instructional conditions 90-sec noise off with no delay was preferred over 120-sec noise off after a 60-sec delay, but that preference shifted to the large reward when a 15-sec delay (T) was added to both alternatives. Experiment 2 replicated this preference reversal under two conditions of large, delayed reward, and with three rather than two values of T. Experiment 3 confirmed this effect of T and showed that some humans committed themselves to the large reward when commitment could be made some time before presentation of the reward alternatives. These data support the Ainslie-Rachlin model and extend it to human choice behavior.     

Developmental changes in infants' sensitivity to octave-band noises

Localization responses to octave-band noises with center frequencies at 200, 400, 1000, 2000, 4000, and 10,000 Hz were obtained from infants 6, 12, and 18 months of age. During an experimental trial, an octave-band noise was presented on one of two speakers located 45° to each side of the infant. A head turn to the noise (correct response) was rewarded by activating an animated toy on top of the speaker. The intensity of the noise was varied over trials (method of constant stimuli) to determine thresholds at each center frequency. Thresholds for the lower frequencies were approximately 5–8 db higher in the 6-month-old infants compared to the older infants. However, there were no consistent differences among groups at the higher frequencies. Infant thresholds were found to be 20–30 db higher than adult thresholds at the lower frequencies. At the higher frequencies thresholds for infants were approaching those of adults.     

The concept of development in vocational theory and intervention

One of the major problems in the vocational literature is the absence of theoretical formulations which deal with development in more than a superficial manner. Specific problems are that (1) key constructs are adapted from developmental theory without proper attention to the conceptual, empirical, and methodological problems involved; (2) little recognition has been accorded to significant changes in developmental theory during the past 15 years, changes which stress the multidimensional, plastic, contextual, and life-span features of development; (3) there is a paucity of adequately designed, contextually sensitive, longitudinal research; and (4) well-established empirical findings of developmental research have been misrepresented or ignored by vocational researchers. It is proposed that a theory of life-span vocational role development must meet the conceptual and methodological requirements of a developmental approach, that it must contain a contextual perspective, and that it must be relational in the sense that it provides for the examination of the “goodness of fit” between individual and contextual developments. The consequences of this viewpoint for vocational intervention are described as a more pronounced focus on events, processes, and life periods which are identified as antecedents of major vocational decisions. Finally, it is observed that vocational intervention should be viewed as a succession of procedures designed to assist the individual, throughout his/her life, to adapt vocational functioning to changing personal situations as well as to changing economic and contextual circumstances.