Methods for rapid quantification of brain autoradiographs

Apparatus and methods are described for rapid semiautomatic quantification of silver grain densities in brain autoradiographs. The output voltage of a photodiode used with dark-field oil microscopy reflects the amount of label in a 35 by 35 square micra area of brain tissue. Apparatus are described for monitoring the movement of a microscope stage, and a microprocessor interface is described that provides hard-copy and paper-tape output of grain densities for later processing.     

Effects of variable-interval value and amount of training on stimulus generalization.

In Experiment 1 pigeons pecked a key that was illuminated with a 501-nm light and obtained food by doing so according to a variable-interval (VI) schedule of reinforcement, the mean value of which differed across groups: either 30 s, 120 s, or 240 s. The pigeons in all three groups were trained for 10 50-min sessions. Generalization testing was conducted in extinction with different wavelengths of light. Absolute and relative generalization gradients were similar in shape for the three groups. Experiment 2 was a systematic replication of Experiment 1 using line orientation as the stimulus dimension and a mean VI value of either 30 s or 240 s. Again, gradients of generalization were similar for the two groups. In Experiment 3 pigeons pecked a key that was illuminated with a 501-nm light and obtained food reinforcers according to either a VI 30-s or a 240-s schedule. Training continued until response rates stabilized (> 30 sessions). For subjects trained with the 30-s schedule, generalization gradients were virtually identical regardless of whether training was for 10 sessions (Experiment 1) or until response rates stabilized. For subjects trained with the VI 240-s schedule, absolute generalization gradients for subjects trained to stability were displaced upward relative to gradients for subjects trained for only 10 sessions (Experiment 1), and relative generalization gradients were slightly flatter. These results indicate that the shape of a generalization gradient does not necessarily depend on the rate of reinforcement during 10-session single-stimulus training but that the effects of prolonged training on stimulus generalization may be schedule dependent.     

The effects of unvocalized music on short-term memory

The studies reported here investigated the role of background music in verbal processing. The experiment was a partial replication of Salame and Baddeley (1989), where the effect of music on the recall of digits, was examined, but included an additional key condition where participants heard instrumental music without the words usually associated with it. In this case we used nursery rhymes. In addition, articulatory suppression was manipulated as a tool to look at the role of working memory in the task. The relationship between long-term memory and working memory was further explored by using an implicit memory task to examine verbal memory effects for words associated with the music but not actually heard. The results indicated that background, instrumental music, long-associated with words, significantly impairs concurrent verbal processing. These long-term memory effects on working memory were, however, not associated with implicit memory effects, and no priming was observed.     

A Value-Added Health Systems Science Intervention Based on My Life,My Story for Patients Living with HIV and Medical Students: Translating Narrative Medicine from Classroom to Clinic

Journal of Medical Humanities - In 2018-2019, at the Keck School of Medicine of the University of Southern California (KSOM), we developed and piloted a narrative-based health systems science...     

The Effects of Differing Knowledge Transfer Strategies on Group Decision Making and Performance

Encouraging reflection on one's existing knowledge in a group setting increases shared understanding, makes information available for problem solving, and makes it easier for members to show and to be shown the merit of others' preferences. However, it is also possible that attempting to constrain the process by which problem solvers manage this reflection process may prevent them from effectively tailoring their approach to different problems. The current research focuses on how the nature of different knowledge transfer strategies impacts problem solving processes and outcomes by examining manipulations of, or constraints to, problem solvers' approach to knowledge transfer. Participants were directed to generate associated knowledge in preparation for answering a series of estimation items, either in a group or individually. We found that groups using a shared reflection process (as opposed to reflecting at an individual member level) were able to give more weight to the inputs of their more expert members and that groups outperformed individuals. We discuss the process of promoting knowledge transfer in a group context relative to an individual context and relate this to the concept of task demonstrability. Copyright © 2017 John Wiley & Sons, Ltd.     

Personality and judgements of abstract,pop art,and representational paintings

This study was concerned with the question of which personality variables are most predictive of judgements of particular types of painting. One hundred and twenty‐one participants rated 24 slides of abstract, pop art, and representational paintings. They then completed two questionnaires which measured sensation seeking (SS) and the ‘Big Five’ personality dimensions. Thrill and Adventure Seeking was positively correlated with a liking of representational art while Disinhibition was associated with positive ratings of abstract art and pop art. Neuroticism was positively correlated with positive ratings of abstract and pop art, while conscientiousness was linked to liking of representational art. Openness to Experience was linked to positive ratings of all three art types. Agreeableness was negatively linked to liking of pop art. It was also found that art education and frequency of visits to art galleries were linked to positive ratings of abstract paintings. Regressional analyses showed about a fifth of the variance could be accounted for by personality and demographic variables. Personality variables were most strongly linked to positive judgements of representational art and least related to ratings of pop art. Overall the sensation seeking variables accounted for more of the variance than the big five dimensions. Copyright © 2001 John Wiley & Sons, Ltd.     

Should We Be Talking About Ethics or About Morals?

This article seeks to revisit the distinction between the words ethics and morals. First, we understand the word ethics to be focused on the way we seek to live our own life, and hence to connote a relativistic and essentially subjective perspective, whereas we understand the word morals to be focused on the way we should live our lives together, especially through sensitivity to viewpoints other than our own. Second, we perceive a usefulness in such a differentiation when the ethical values of those in a dilemmatic situation are conflicted in order to prioritize moral decision making in contemporary society. We argue that in our current era, characterized by a multiplicity of faiths and by pronounced value pluralism, a philosophical basis for moral decision making needs to be clearly attuned with intersubjectivity and interconnectivity among people. It should be able to determine principles of conduct toward others, no matter how one’s own ethical values, conceptions of the good, or life choices might differ from those of others. To do this, we relocate ethical decision making away from an essentially monological reflection on our own values and purposes into a social space wherein we have an inclusive, noncoercive, and reflective dialogue.     

Effects of explaining on children's preference for simpler hypotheses

Research suggests that the process of explaining influences causal reasoning by prompting learners to favor hypotheses that offer “good” explanations. One feature of a good explanation is its simplicity. Here, we investigate whether prompting children to generate explanations for observed effects increases the extent to which they favor causal hypotheses that offer simpler explanations, and whether this changes over the course of development. Children aged 4, 5, and 6 years observed several outcomes that could be explained by appeal to a common cause (the simple hypothesis) or two independent causes (the complex hypothesis). We varied whether children were prompted to explain each observation or, in a control condition, to report it. Children were then asked to make additional inferences for which the competing hypotheses generated different predictions. The results revealed developmental differences in the extent to which children favored simpler hypotheses as a basis for further inference in this task: 4-year-olds did not favor the simpler hypothesis in either condition; 5-year-olds favored the simpler hypothesis only when prompted to explain; and 6-year-olds favored the simpler hypothesis whether or not they explained.