Possible role of confounded taste stimuli in conditioned taste aversions

In many publications, Sjödén, Archer, and their colleagues have studied conditioned taste aversions and found that in addition to taste, the bottle and/or spout containing a solution exerts strong control over the expression of an aversion. For example, Sjödén and Archer claim that this bottle stimulus will support a bottle-illness association even with long delays between the bottle and illness and after only a single conditioning trial. They have interpreted their results as indicating that contextual effects are important in taste-aversion learning. However, a confound in their procedure, stemming from the bottles they used, could explain their results in a simple way. Sjödén and Archer have emphasized that the bottle stimuli they used to distinguish between contexts consisted of one of two different sizes of drinking spouts, the larger of which made a clicking noise when licked. However, the larger spouts were always attached to plastic bottles and the smaller spouts were always attached to glass bottles. If discriminable tastes from the plastic bottles existed, then taste may have been inadvertently manipulated. Support for the likelihood of a plastic taste includes the seminal work on taste-aversion learning that stemmed from the serendipitous use of plastic bottles in the cage that rats were irradiated in and glass bottles in the home cages (see Garcia, McGowan, & Green, 1972). In these early demonstrations, rats learned to avoid the taste of water in the plastic bottles but not the taste of water in the glass bottles.     

Changing practices: influences on classroom assessment

The pedagogical potential of classroom assessment to support student learning has increasingly been evidenced in research over the past decade. Constructive classroom assessment has been championed by assessment specialists, and endorsed by professional organizations. In practice, however, the process of changing classroom assessment from its traditionally summative orientation is not straightforward. This methodical review looks at how six sources, which are educational research, evaluative inquiry, large‐scale assessment, educational policy, professional development, and teachers’ beliefs, influence and mediate assessment practices. A group of purposively selected research articles are analysed as evidence of the dynamics in this complex process. Cross‐currents relating to research perspective, collaboration, and time are discussed. For the movement seen in this study to continue, the tension between teacher autonomy and school community, and the relationship between collective commitment and assessment literacy should be considered.     

The Consistency and Concomitants of Inhibition: Some of the Children, All of the Time

Toddlers displaying extremely inhibited behavior may be at risk for becoming socially withdrawn. However, behavioral inhibition may be a multifaceted characteristic, and its concurrent relation to toddler wariness with peers has not been examined. In this study, 108 toddlers (54 females) and their mothers were observed in novel situations involving unfamiliar settings, adults, and peers. Vagal tone, temperament, separation-reunion behavior, and maternal oversolicitousness also were assessed. There was little consistency of inhibited behavior across the 3 situations. Consistently inhibited toddlers had fearful temperaments, showed distress following maternal separation, and had mothers who were warm and controlling but unresponsive to children's cues during interaction. Toddlers with highly fearful temperaments and highly oversolicitous mothers were the most inhibited across contexts.     

Intentionality as measured in the persistence and elaboration of communication by chimpanzees (Pan troglodytes)

In human infancy, 2 criteria for intentional communication are (a) persistence in and (b) elaboration of communication when initial attempts to communicate fail. Twenty-nine chimpanzees (Pan troglodytes) were presented with both desirable (a banana) and undesirable food (commercial primate chow). Three conditions were administered: (a) the banana was delivered (successful communication), (b) half of the banana was delivered (partially successful communication), and (c) the chow was delivered (failed communication). The chimpanzees exhibited persistence in and elaboration of their communication in every condition except when the banana was delivered. Thus, their communication was about a specific item, demonstrating that both intentionality and nonverbal reference are capacities shared by humans with our nearest living relatives, the great apes.     

Control of Practice and Level of Feedback in Computer-Based Instruction

This study investigated the effect of type of control and level of feedback during computer-based instruction. Subjects completed a computer lesson about the microscope that presented either mandatory or optional practice questions. Practice was accompanied by either elaboration feedback, correct-answer feedback, or no feedback. Results indicated that level of feedback had a significant effect on achievement and attitudes. Implications for including feedback in computer-based instruction are discussed.     

Assessing sex and career biases in screening candidates for a deanship: An experimental study

To test how sex biases operate in the screening of candidates for administrative positions, an experimental study was conducted to evaluate the contribution of gender and career pattern effects on candidates' ratings. Faculty from seven universities were asked in a task that was judged to be realistic to evaluate vitae of six candidates for a deanship of a college of arts and sciences. Experimental design permitted alteration of the vitae to change gender and career patterns. No significant difference was found in the ratings assigned to male and female candidates. Career break did have a significant effect; candidates with career breaks received higher ratings on the average than those without career breaks. There was no significant interaction of gender and career break. Three different ratings systems were used, but none interacted with either gender or career break. However, closer examination of screeners' ratings did suggest that career experience was evaluated in different ways for male and female candidates.     

The limited value of planning in education: Getting back to the basics isn't all about curriculum

In these times of tight budgets and political intoleance for taxation, public schools, particularly urban public schools, will continually have to look for ways in which to spend less while dealing with ever-increasing societal problems. While the ability of schools to improve the overal “product” with less resources is highly suspect, this article addresses one way in which spending less might actually improve school perfomance. The best planners in the best schools should be the administration, techers, students, parents, and the comminitu at large, and not outside esxperts hired to improve a school's “comprehensive” or “strategic” plan. By forcing the segments of the public that have the largest stake in the educational outcomes of schools to work together to plan for the future, schools will improve the efficacy of their staffs, their students, and allow parents the self-satisfaction of playing an important role in their children's education. An improtant side effect of such a method may be an increasing awareness by the public of the difficulties that schools face, and perhaps a better understanding of the important need for higher expenditures. His research interests include professionalism, collective bargaining, and educational reform. His articles have appeared inPeople and Education, and a recent article has been aceepted for publication in theJournal of Collective Negotiations in the Public Sector.