Students as meaning-makers and the quest for the common school: A micro-ethnography of a US history classroom

This study examined the extent to which (a) nine US history students developed historically-grounded perspectives, and (b) the entire class engaged itself in inclusive, moral debate about historical events and issues. Inductive methods were used in this micro-ethnographic study to construct and verify its themes though interview, classroom observation and student survey. Seven students demonstrated identifiable perspectives. History was viewed by these students as personally-constructed interpretations, not as value-free chronologies. Only one student's perspective, however, was historically-grounded; other perspectives were grounded in references to contemporary issues. Evidence of moral debate was limited totwo debates observed during 24 classroom observations. These two findings seemed interconnected: students with little historical grounding to their perspectives may have little inclination toward collective, ethical critique. Moral debate consisting of student exchange of diverse historically-grounded perspectives was not the classroom norm. The debates that went into the making of American society concerned not just institutions or governing principles, but the capacity of humans to sustain those institutions. Whatever the disagreements were over other issues at the American Constitutional Convention \[in Philadelphia in 1787], the fundamental question sensed by everyone … was whether the people themselves would understand what it meant to hold the ultimate power of society, and whether they had enough sense of history and destiny to know where they had been and where they ought to be going. (Cousins; cited by Goodlad 1979: 40; emphasis added)     

Age-related incidence curve of hospitalized Shaken Baby Syndrome cases: convergent evidence for crying as a trigger to shaking

OBJECTIVE: To determine whether there is an age-specific incidence of hospitalized cases of Shaken Baby Syndrome (SBS) that has similar properties to the previously reported normal crying curve, as a form of indirect evidence that crying is an important stimulus for SBS. DESIGN AND SETTING: The study analyzed cases of Shaken Baby Syndrome by age at hospitalization from hospital discharge data for California hospitals from October 1996 through December 2000. PATIENTS: All cases of children less than 18 months (78 weeks) of age for whom the diagnostic code for Shaken Baby Syndrome (995.55) in the International Classification of Disease, Ninth Edition, Clinical Modification was assigned. RESULTS: There were 273 hospitalizations for SBS. Like the normal crying curve, the curve of age-specific incidence starts at 2-3 weeks, has a clear peak, and declines to baseline by about 36 weeks of age. In contrast to the normal crying curve that peaks at 5-6 weeks, the peak of SBS hospitalizations occurs at 10-13 weeks. CONCLUSIONS: The age-specific incidence curve of hospitalized SBS cases has a similar starting point and shape to the previously reported normal crying curve but the peak occurs about 4-6 weeks later. Of the likely predisposing causes, this pattern is only consistent with the properties of early crying. There are numerous explanations for the lag in the peaks between crying and SBS hospitalizations, including the possibility of repeat shakings prior to hospitalization. The importance of crying as a stimulus to SBS may provide an opportunity for preventive intervention.     

Proactive interference in the retention of “attentional sets” in pigeons

In Experiment 1, six groups of pigeons (n=8) were tested for wavelength generalization either immediately or 24 h after learning a successive discrimination, with 550 nm reinforced and a black vertical line extinguished. The groups differed in the stimulus present during single stimulus pretraining, which was 550 nm (pretrain S+), the vertical Une (pretrain S?), or a neutral dim white light (pretrain Sn), respectively. The three immediate generalization gradients were steep and indistinguishable, reflecting only the immediately preceding discrimination training condition. The three delay gradients were flatter, with the flattening particularly marked in the pretrain S? group. This was interpreted as proactive interference (PI) resulting from the memory that both the 550-nm and the line stimuli had previously been reinforced. In Experiment 2, two (TD) groups of pigeons (n=16) were given single stimulus training with a 555-nm keylight followed by eight sessions of discrimination training with two line angles, then one session of non-differential (ND) training with the same two lines, and then a wavelength generalization test either immediately or after a 24-h delay. Two other (hold) groups (n=16) received similar training, except for the TD Une angle training sessions, in these hold groups, the wavelength gradient was flatter in a delayed test; in the TD groups it was steeper, indicating PI from the prior TD training. These two experiments suggest that the “attentional sets,” which purportedly result from TD and ND training, may fruitfully be viewed as target memories subject to the principles of interference theory.