Effects of food deprivation on learning and expression of flavor preferences conditioned by saccharin or sucrose

In four experiments, food deprivation was varied during conditioning and testing of conditioning of flavor preferences by sweeteners. Conditioned preferences for a flavor associated with a more concentrated solution were enhanced by increased deprivation in training whether sucrose or saccharin was used when rats consumed solutions freely during training. When consumption of solutions was controlled and higher deprivation levels were used, preference for the higher concentration of sucrose was still enhanced by increased deprivation in training, but this did not occur with saccharin. We suggest that deprivation may enhance the reinforcing value of sweetness only when calories increase along with sweetness. We also suggest that deprivation can enhance flavor preference learning by increasing consumption and thereby increasing exposure to the flavored solutions.     

Exploring the Complexity of Students’ Scientific Explanations and Associated Nature of Science Views Within a Place-Based Socioscientific Issue Context

Science & Education - In addition to considering sociocultural, political, economic, and ethical factors (to name a few), effectively engaging socioscientific issues (SSI) requires that...     

A transformation model of engineering education

A transformation model of engineering education at the undergraduate level is constructed to define the human and technical resources that contribute to the production of a university-trained engineer. The theory of technical systems is applied in the development of the model to transform a graduating pre-university pupil into a university-trained engineer. Two co-aligned themes are identified as the executive system and the execution system, which dictate who and what will do the work and how the work will be completed, respectively. The model is an extension of an existing model and further depicts the duality of the pre-university pupil as an operator and as the operand as related to engineering education. Consequently, the proposed model details the student perspective from the bottom-up in an implicit manner and the top–down perspective from administrators and professors in an explicit manner. The model's utility is in providing a means by which to coordinate efforts of pre-college and university-level educational sectors in the production of entry-level engineers.