Aging is associated with increased Weber ratios

To investigate whether age-associated changes in the human taste system are quality-specific, we compared young and elderly subjects’ suprathreshold discrimination abilities for caffeine and sucrose. The method of constant stimuli was used to obtain just noticeable differences and Weber ratios. The elderly generated larger Weber ratios than did the young for both the medium and high concentrations of caffeine, but not for the low concentration. For example, a 74% increase in .005 M caffeine was required to obtain a perceptible difference for the elderly, whereas a 34% increase produced a perceptible difference for the young. The Weber ratios for sucrose did not differ for the two age groups. The results of this study indicate that age-associated changes in the taste system are quality-specific.

     

Equivocations on knowledge systems theory: An actor-oriented critique

Knowledge systems theory, in our view, tends to obscure rather than illuminate an understanding of the fundamentals of knowledge processes in society. This tendency occurs primarily because both the theory, and the methodologies that are derived from it, fail to recognize that knowledge processes are social processes, and thereby that knowledge itself has to be envisaged as a social construction. As a result of this omission, knowledge systems theory and methodology can only deal poorly with issues of power and social conflict, and, at the same time, tend to make use of several inappropriate teleological and reifying notions. According to our view, the understanding of knowledge processes will benefit greatly from a more actor-oriented perspective. In such an approach, emphasis is accorded to human agency and the concept of multiple knowledge networks. Central purposes of actor-oriented methodologies then, are to clarify how actors attempt to create space for their own ‘projects’ and to determine which elements contribute to or impede the successful creation of such space for maneuver. Norman Long is a member of the Department of Rural Sociology of the Tropics and Subtropics at Wageningen Agricultural University, P.O. Box 8130, 6700 EW, Wageningen, The Netherlands. He is known for his work in the sociology of rural development. Magdalena Villarreal recently acquired her M.S. in “Management of Agricultural Knowledge Systems” at Wageningen Agricultural University. She is presently working on a Ph.D. proposal on issues of power, gender, and intervention.     

Serum creatinphosphokinase (CPK) in endogenic psychoses]

Creatinphosphokinase (CPK) was determined in 141 patients with manic-depressive and schizophrenic psychoses. In general endogenic psychoses of the manic and depressive type as well as chronic schizophrenias show normal CPK values. In acute cases of paranoid-halluzinatory schizophrenias normal values are predominant. In catatonic schizophrenias, as a rule, clearly increased enzyme activities are found. Thise increased values suggest a postulated somatic disease as a cause of the psychosis. Thus, the determination of CPK provides a useful aid in the diagnosis and control of the course of catatonic schizophrenic.     

Comparative experimental animal studies of the effects of various nuclear pharmaceuticals on the EEG

Some of the radiopharmaceuticals presently recommended for cisternoscintigraphy were compared, in experiments on animals, for their effects upon bioelectric activity. On relaxed cats, electroencephalography did not show any effects upon bioelectric activity for 198 Au and 169 Yb Ca DTPA. One test animal each of seven and six cats examined using 169 Yb DTPA and 131 J HSA showed changes in the electroencephalogram subsequent to suboccipital application.     

McCollough effect: A theory based on the anatomy of the lateral geniculate body

A model network derived from anatomy and physiology of the monkey retina and lateral geniculate body (LGN) is presented. Control of the strength of concentric surrounds by receptive field center illumination leads to inhomogeneous use of different surround parts, and this occurs even in the presence of irregular eye movements (“autostroboscopic impression”). Various pattern- and movement-contingent color aftereffects, as well as threshold findings, can be explained. Anatomical studies have revealed that the output signals of LGN interneurons are presynaptically controlled at each ending by retinal afferents. This is assumed to result in the above center-surround interaction, and it implies that an interneuron producesdifferent output signals at each of its numerous output endings. The inability of the somatic metabolic machinery to cope with a multitude of different time-varying demands is proposed to be the origin of the remarkably long persistence of the McCollough effect     

Putting the social back into physical distancing: The role of digital connections in a pandemic crisis

During the COVID-19 pandemic, physical distancing is necessary to reduce the spread of the coronavirus. To compensate for the lack of social encounters, people have been advised to connect with others via digital communication channels. Drawing on a psychological framework combined with assumptions from communication science, we therefore investigated whether technology-mediated communication can actually meet individuals' social needs to foster compliance with distancing measures and whether there are differences between distinct communication channels. Based on an online survey (N = 301) during the first national lockdown in Germany, we found that the impact of audio-visual communication is limited. Instead, the data showed that text-based communication indirectly fostered willingness to adhere to physical distancing through the pathway of increased feelings of social support and life satisfaction. Three follow-up surveys (N = 180) revealed that while feelings of social support increased, people's technology-based communication and willingness to adhere to distancing measures decreased. Our results challenge the assumption that audio-visual communication compensates for lack of physical contact more effectively than text-based communication. This study highlights the potential of text-based communication to increase feelings of social support, which may be particularly important during a pandemic.     

Singular troubles with singleton socrates

I identify a problem for Kit Fine’s truthmaker semantics for ground: it excludes a range of plausible structures of grounding hierarchies. Specifically, there is an attractive view about the grounds of the existence of individual singleton sets which is inconsistent under the truthmaker account. I then develop a modification of the truthmaker account which avoids this difficulty and show that it preserves most of the desirable features of the original account, such as the propositional logic of ground it yields.     

Attachment in Context: The Role of Demographic Factors Among Indonesians from Three Ethnic Groups

This study examined attachment in Indonesia, one of the fourth most populous countries in the world. We applied the Indonesian version of the Attachment Style Questionnaire (ASQ) on 1313 Indonesians from three ethnically diverse samples (404 Bataks, 430 Minangkabau, and 479 Javanese). We assessed demographic factors which consist of the roles of the living-with-family experience (M = 19.58 years), age (M = 24.34 years old), sex (man = 43.4 %), and ethnicity in attachment dimensions development. Pearson’s correlation analyses revealed negative correlations between the living-with-family experience as well as age and the two attachment dimensions, Need for approval and confirmation by others and Preoccupation with relationships. Group comparison analyses found significant differences for the five scales of ASQ among sex and ethnic groups. We also found a significant main effect of age and ethnicity on some of the ASQ scales.