73 research outputs found
Pavlov's Cockroach: Classical Conditioning of Salivation in an Insect
Secretion of saliva to aid swallowing and digestion is an important physiological function found in many vertebrates and invertebrates. Pavlov reported classical conditioning of salivation in dogs a century ago. Conditioning of salivation, however, has been so far reported only in dogs and humans, and its underlying neural mechanisms remain elusive because of the complexity of the mammalian brain. We previously reported that, in cockroaches Periplaneta americana, salivary neurons that control salivation exhibited increased responses to an odor after conditioning trials in which the odor was paired with sucrose solution. However, no direct evidence of conditioning of salivation was obtained. In this study, we investigated the effects of conditioning trials on the level of salivation. Untrained cockroaches exhibited salivary responses to sucrose solution applied to the mouth but not to peppermint or vanilla odor applied to an antenna. After differential conditioning trials in which an odor was paired with sucrose solution and another odor was presented without pairing with sucrose solution, sucrose-associated odor induced an increase in the level of salivation, but the odor presented alone did not. The conditioning effect lasted for one day after conditioning trials. This study demonstrates, for the first time, classical conditioning of salivation in species other than dogs and humans, thereby providing the first evidence of sophisticated neural control of autonomic function in insects. The results provide a useful model system for studying cellular basis of conditioning of salivation in the simpler nervous system of insects
Making Sense Through Participation
In this chapter we discuss the issue of social differences in relation to learning. In theories on co-operative learning or
collaborative learning social differences are treated as characteristics of individual learners. The focus on learning as
a social process is primarily elaborated in terms of interaction between pupils and the combined construction of knowledge. Sociocultural
theory (Vygotsky, Lave & Wenger), however, understands âsocialâ not only in terms of knowledge/meaning being constructed in
interaction with others, but also in terms of the cultural practices/activities informing these interaction processes. Learning
can be understood as increasing participating in communities of practice. As social differences are an intrinsic part of the
culture in which students are learning to participate, these are also an inherent aspect of learning processes in schools.
Students learn to participate in practices in different ways, depending on their social position, and thus develop distinguished
cultural identities. In this chapter we elaborate on this tenet, using examples from various empirical research projects on
learning in secondary education. We not only show how social differences in the cultural practices that underpin learning
influence what is learned by whom, but also explore the consequences of this perspective for the pedagogical space of the
school
Learning and the development of social identities in the subjects Care and Technology
This article discusses the way in which social identities structure the learning processes of students in two subjects in the Dutch secondary school curriculum - Care and Technology. It analyzes interviews with 23 students and their teachers with a view to explaining the disappointing results in these subjects in terms of breaking through gender and class-related preferences and learning outcomes. The subjects Care and Technology refer on the one hand to social practices with which groups of students identify in different ways. On the other hand students also appear to make active use of these subjects in their identity development. We argue for explicitly combining the notion that learning is peripheral participation in social practices with analyses of the power relationships that structure those practices. Also the question should be addressed of how the relative autonomy of the school can be used for organizing learning experiences in such a way that social positions and identities are not inhibitive, and the restrictive character of social identities is challenged
When the Rules of Discourse Change, but Nobody Tells You: Making Sense of Mathematics Learning From a Commognitive Standpoint
In this article we introduce a research framework grounded in the assumption that thinking is a form of communication and that learning a school subject such as mathematics is modifying and extending oneâs discourse. This framework is then applied in the study devoted to the learning of negative numbers. The analysis of data is guided by questions about (a) the discourse on negative numbers as such, and the features that set it apart from the mathematical discourse with which the students have been familiar when the learning began; (b) studentsâ and teacherâs efforts toward the necessary transition to the new meta-discursive rules, and (c) effects of the learning teaching process, that is, the extent of discursive change resulting from these efforts. Our findings lead to the conclusion that discursive change, rather than being necessitated by an extradiscursive reality, is spurred by communicational conflict, that is, by the situation that arises whenever different interlocutors seem to be acting according to differing discursive rules. Another conclusion is that school learning requires an active lead of an experienced interlocutor and is fuelled by a realistic communicational agreement between her and the learners
Stability of treatment with self-ligating brackets and conventional brackets in adolescents: a long-term follow-up retrospective study
Looking Back and Moving Forward: a Commentary on âInstinct and The Ego during Infancyâ
Discussion of Presentations by Barry Dauphin, Charles Grayson, and Brenda Lovegrove Lepisto for the Panel âAll Wired Up: Tweens, Teens, Technology and Treatmentâ
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