A motion aftereffect for long-range troboscopic apparent motion

The existence of a directional motion aftereffect (MAE) for long-range (LR) stroboscopic apparent motion (SAM) was examined with the use of a directionally ambiguous test stimulus. The spatial and temporal parameters were such that the LR, rather than the short-range, mechanism was likely to be implicated. MAEs were found for SAM, which were in the same direction, but somewhat weaker than those for a comparable stimulus in real motion. The MAEs for SAM were present only when good apparent motion was perceived, and could be shown also when only the unstimulated area between the two stroboscopic flashes was tested. The LR mechanism was further implicated, since the MAEs were also obtained under dichoptic adaptation conditions. It is concluded that the LR-motion mechanism does show a usual MAE under proper testing conditions.     

Involvement of alpha-bungarotoxin-sensitive nicotinic receptors in long-term memory formation in the honeybee (Apis mellifera)

In the honeybee Apis mellifera, multiple-trial olfactory conditioning of the proboscis extension response specifically leads to long-term memory (LTM) which can be retrieved more than 24 h after learning. We studied the involvement of nicotinic acetylcholine receptors in the establishment of LTM by injecting the nicotinic antagonists mecamylamine (1 mM), alpha-bungarotoxin (alpha-BGT, 0.1 mM) or methyllycaconitine (MLA, 0.1 mM) into the brain through the median ocellus 20 min before or 20 min after multiple-trial learning. The retention tests were performed 1, 3, and 24 h after learning. Pre-training injections of mecamylamine induced a lower performance during conditioning but had no effect on LTM formation. Post-training injections of mecamylamine did not affect honeybees' performances. Pre-training injections of MLA or post-training injection of alpha-BGT specifically induced LTM impairment whereas acquisition as well as memory retrieval tested 1 or 3 h after learning was normal. This indicates that brain injections of alpha-BGT and MLA did not interfere with learning or medium-term memory. Rather, these blockers affect the LTM. To explain these results, we advance the hypothesis that honeybee alpha-BGT-sensitive acetylcholine receptors are also sensitive to MLA. These receptors could be essential for triggering intracellular mechanisms involved in LTM. By contrast, medium-term memory is not dependent upon these receptors but is affected by mecamylamine.     

An interpersonal circumplex model of children's social goals: links with peer-reported behavior and sociometric status

The objective of the present research was to develop an assessment model for children's social goals. The aims were (a) to fit children's social goals to a circumplex model and to examine links between goals and peer-reported social behaviors (aggression, withdrawal, and prosocial behavior) in a sample of 276 participants (134 girls, 11- to 12-year-olds) and (b) to replicate these findings and examine whether social behavior mediates the relationship between goals and sociometric status in an independent cross-validation sample of 310 participants (143 girls, 11- to 13-year-olds). Results showed a satisfactory fit to the circumplex model and adequate psychometric properties of the goal scales of the new measure, the Interpersonal Goals Inventory for Children. Other findings included significant and meaningful relations between goals and peer-reported behavior. Social behavior mediated the relations between goals and sociometric status.     

Gadamer and the Otherness of Nature: Elements for an Environmental Education

In this work I search for elements that contribute to the development of the ethical dimension of environmental education. I start with the existence of what C.A. Bowers calls “areas of silence” in the curriculum in both schools and universities. The reason for this silence, I argue, is to be found in the Cartesian conceptual structures of curricula. I suggest that the works of Bacon, Galileo and Descartes provoke a twofold process that I have termed the forgetting of tradition and objectification of nature. As a corrective to this process, I explore the possibilities that the philosophical hermeneutics of Hans-Georg Gadamer opens for rehabilitation of tradition and de-objectification of nature. I work with the concept of the “dignity of things” present in Greek dialectics: that nature is not simply a projection of mind (as the neo-Kantians claim), but something that thought suffers. In my conclusions I argue that for nature to be reinserted into almost all areas of knowledge it is necessary that we respect “the otherness of nature.”     

Psychometric properties and standardised data for questionnaires measuring negative affect, dispositional style and daily hassles. A nation-wide sample

Within the behavioral field, self-report inventories measuring emotional condition from a state/trait perspective are in frequent use. Some of these measures have insufficient standardisation and/or are out of date. In order to upgrade some of the frequently used self-report inventories a nation-wide survey ( N =2500) was performed. Measures of negative affect (state-anxiety STAI-S , trait-anger STAS-T ), and depression ( CES-D ), dispositional style ( LOT ) and daily hassles ( DH ) were examined. Psychometric data and demographic differences for all the inventories used are presented. The reliability measures for the scales show high consistency, ranging from 0.76 to 0.95 (Cronbach's alpha). The overall results indicate that females are more hassled, depressed, anxious, hostile, and have a more negative dispositional style than males. These results are most pronounced among younger females.     

Potential nutrition messages in magazines read by college students

Advertisements in magazines read by 12% or more of college students enrolled in an introductory nutrition class were surveyed for hidden food and nutrition messages. Meanings were identified by categories of activities, products, and people. Less than 10% of the ads featuring people fell into food categories. Of these, more were for alcohol and supplements; fewer were for basic or extra-calorie foods. Hidden messages for females could imply beauty through fashion products, beauty aids, and supplements but with a nutrition slimming plan. Males may be receiving a subtle message that food choices do not matter, and that alcohol and supplements are desirable in everyday life.     

An experiment on the theory of visual motion perception

Two classes of theories of motion perception were studied: correlation and gradient models (in the sense of D. Marr). Random-dot kinematograms with a shifted square were presented to subjects, and the 80% threshold for detection of correct direction of movement was determined. Correlation models predict scale invariance, that is, a constant shift measured in units of texture elements of the translated pattern in spite of a geometric magnification. This was refuted for all subjects. The increase of the recognizable translation with the area of the translated form was verified except for the patterns with the largest texture elements (8 minutes of arc). This prediction, however, is not very specific for competing theories. Gradient models are not yet fully specified, and they contain some free parameters. They cannot be tested strictly, but there exist reasonable numerical parameter values by which our data can be satisfactorily explained.     

Perelman's rhetorical foundation of philosophy

This article is a Gadamer-Perelman's debate. The author points out the limits of the gadamerian's hermeneutic conception of philosophy and criticizes this conception from Perelman's new rhetoric point of view. Instead of speaking of truth as an ontological originary experience, the rhetorical foundation of philosophy allows us to say that in philosophy the important is the contrastation and the confrontation of criteria and that, for that reason, philosophy is above all characterized by discussibility.Philosophical argumentation, like juridical argumentation, constitutes applications, to different domains, of a theory of argumentation which we consider as a new rhetoric.By identifying this theory with the general theory of persuasive speech, which seeks to obtain the intellectual as well as the emotional adherence of an audience, no matter which, we state that all speeches which do not aspire to an impersonal validity proceed from rhetoric. (Ch. Perelman,L'empire rhétorique, p. 177).But, if one does not admit that the philosophical thesis may be founded on evident intuitions, it will be necessary to reccur to argumentative technics to make them prevail. The new rhetoric then becomes the indispensable tool of philosophy. (Ch. Perelman,L'empire rhétorique, p. 21).