Language and Operations in Children's Class Inclusion Reasoning: The Operational Semantic Theory of Reasoning

In this article we critique two prominent theories of reasoning—mental logic and mental models—and argue that reasoning does not consist of either applying logical rules or constructing mental models. Instead, we propose anoperational semantictheory of reasoning, according to which reasoning is based on children's operational understanding of key terms in a given problem. We then go on to consider an important recent developmental theory of reasoning, fuzzy-trace theory. In order to illustrate the view of reasoning proposed here we report a study of class inclusion. Dramatic differences in class inclusion performance were found as the result of linguistic context; performance was significantly higher when an explicit request for a subclass comparison preceded the class inclusion question as compared to a standard condition when the class inclusion question alone was asked. This was the case, however, only when the prior subclass comparison question referred to the same dimensions as the class inclusion question and not when irrelevant subclasses were referred to. Children's performance was also better when they sorted the materials into the supraordinate class as compared to the subclasses, but not when the experimenter sorted them for the child. These effects due to the operational and linguistic manipulations are discussed in terms of a generaloperational semantictheory of reasoning.     

Arousal and the Bakan vigilance task: The effects of noise intensity and the presence of others

The joint effects of social setting and loud noise on task performance are examined. In a modified version of the Bakan vigilance task subjects were required to detect a sequence of two identical even digits and to report the two digits preceding the signal. Two types of acoustic environment were compared: loud noise at 90 dBC and quiet noise at 60 dBC. Two types of social setting were employed: “pair” where two subjects worked in the same room on similar tasks, and “single” where a subject performed the task alone. The effects of noise and the presence of another did not interact. Loud noise increased the speed of responses to signals early in the task. This effect is attributed to noise-induced arousal. There was a higher incidence of recall errors in pre-signal digits when subjects were in pairs. This effect is attributed to distraction. This research was part of a series of studies sponsored by the Social Science Research Council (Grant HR 5563 awarded to Dr. A.J. Chapman and Dr. D.M. Jones).     

Children's sensitivity to traffic hazard in peripheral vision

Although children and adults have poorer peripheral vision than foveal vision there is contradictory evidence about the developmental changes that occur in peripheral sensitivity. Previous research on detections of traffic hazard has not, however, provided any evidence that peripheral vision is implicated in the particualr vulnerability of children to pedestrain accidents. In the absence of differences in peripheral detections it was hypothesized that children may nevertheless be less efficient than adults in utilizing information presented in the periphery. Road traffic scenes depicting vehicles in potentially hazardous and non-hazardous positions for road crossings were presented to adults and to childre, aged 7, 9, and 11. Results confirmed that children were relatively no poorer than adults at hazard detection in peripheral vision than in foveal vision, but indicated that they were marginally poorer at utilizing information presented in the periphery, as measured by a vehicle recognition test. Against expectd developmental trends 9-year-olds were as fast as adults at hazard detection, but no different from the other groups of children in recognition performance. Evidence that information detected and assimilated in peripheral vision does not contribute to the high pedestrian accident rates of children comes from the absence of any sex differences favouring girls. Since girls have considerably lower accident rates than boys, it would have been expected that both their detection and recognition performance would have been higher.     

Focus of attention in groups: a self-attention perspective

In three studies, we examined the hypothesis, derived from self-attention theory, that the focus of attention of individuals in groups varies as a function of group composition. In naturally occurring, nonlaboratory settings, Studies 1 and 2 demonstrated a decrease in first-person singular pronoun usage as the proportionate number of discussants in a group increased. In a laboratory setting, Study 3 demonstrated an increase in self-reported self-focus as the number of subjects decreased relative to the number of experimenters. These results support the conceptualization of self-focused attention as a mediator of group composition effects.     

Reaching for the unknown: Multiple target encoding and real-time decision-making in a rapid reach task

Decision-making is central to human cognition. Fundamental to every decision is the ability to internally represent the available choices and their relative costs and benefits. The most basic and frequent decisions we make occur as our motor system chooses and executes only those actions that achieve our current goals. Although these interactions with the environment may appear effortless, this belies what must be incredibly sophisticated visuomotor decision-making processes. In order to measure how visuomotor decisions unfold in real-time, we used a unique reaching paradigm that forced participants to initiate rapid hand movements toward multiple potential targets, with only one being cued after reach onset. We show across three experiments that, in cases of target uncertainty, trajectories are spatially sensitive to the probabilistic distribution of targets within the display. Specifically, when presented with two or three target displays, subjects initiate their reaches toward an intermediary or ‘averaged’ location before correcting their trajectory in-flight to the cued target location. A control experiment suggests that our effect depends on the targets acting as potential reach locations and not as distractors. This study is the first to show that the ‘averaging’ of target-directed reaching movements depends not only on the spatial position of the targets in the display but also the probability of acting at each target location.     

Rejecting the Null: Research and Social Justice Means Asking Different Questions

The focus of this article is on the specific ethical issues related to social justice research and the practical implications of engaging in social justice research, including the potential impact of research results on practice, policy, and advocacy at the local and national level. Specific recommendations are offered, including identifying research questions that advance social justice, managing researcher bias and power differentials, improving research methodologies, disseminating research, and giving back and advocating for social justice concerns.