The statistics instructor faces 4 major challenges unique to this course: motivating students to study material they think is uninteresting, handling math anxiety, dealing with performance extremes, and making the learning memorable. We discuss each challenge along with solutions offered in the literature.
Age-related differences in cognitive processes were used to understand agerelated declines in creativity. According to the Geneplore model (Finke, Ward, & Smith, 1992), there are two phases of creativity -generating an idea and exploring the implications of the idea -each with different underlying cognitive processes. These two phases are measured in the Creative Invention Task (CIT; Finke, 1990). Younger adults (n = 41) and older adults (n = 41) completed the CIT, the Torrance Tests of Creative Thinking (TTCT), and a measure of working memory capacity (Paper Folding test). In addition, the CIT was scored by both younger and older adults. There were age-related declines on both phases of the CIT, but not on the TTCT. These declines were noted by both the younger and older raters. After adjusting for working memory capacity, however, age-related differences on the CIT were nonsignificant.
This study examined the bizarre imagery effect in young and older adults, under incidental and intentional conditions. Intentionality was manipulated across experiments, with participants receiving an incidental free recall test in Experiment 1 and an intentional test in Experiment 2. This study also examined the relation between working memory resources and the bizarreness effect. In Experiment 1 young and older adults were presented with common and bizarre sentences; they later received an incidental recall test. There were no age differences in sensitivity to the bizarreness effect in Experiment 1 when ANOVAs were used to analyze the data. However, when the bizarreness effect was examined in terms of effect size, there was evidence that younger adults produced larger bizarreness effect sizes than younger adults. Experiment 2 further explored age differences in sensitivity to the bizarreness effect by presenting young and older adults with bizarre and common sentences under intentional learning conditions. Experiment 2 failed to yield age differences as a function of item type (bizarre vs. common). In addition, Experiment 2 failed to yield significant evidence that the bizarreness effect is modulated by working memory resources. The results of this study are most consistent with the distinctiveness account of the bizarreness effect.
Two experiments compared the potency of continuous infusions of cholecystokinin octapeptide (CCK-8) for reducing sucrose intake when administered into abdominal arteries or the jugular vein. Adult, male Sprague-Dawley rats received 22-min infusions of saline or several doses of CCK-8. Sucrose was available for 20 min, beginning 2 min after onset of infusions. In the first experiment, intraceliac CCK-8 in doses of 50, 125, and 312 ng produced significant reductions in intake, but no dose affected intake when administered into the jugular vein. In experiment 2, only the highest dose, 312 ng, suppressed intake when infused into the superior mesenteric artery, and jugular infusions were again ineffective. Behavioral observations indicated that intra-arterial CCK-8 had no affect on feeding within the first several minutes of test meals but accelerated the subsequent decline in incidence of feeding. These results suggest that receptors involved in cholecystokinin satiety are widely distributed within the gastrointestinal tract.
This study examined the effects of homograph meaning frequency on semantic satiation within an ambiguity resolution paradigm. Participants received 3 homograph conditions: the concordant (QUICK-FAST-SPEEDY), discordant (HUNGER-FAST-SPEEDY) and neutral (CEILING-FAST-SPEEDY). On each trial, a prime (e.g., QUICK) was presented for various numbers of repetitions. Afterward, the prime was removed and participants made relatedness judgments about a homograph and target. On half of the trials, the prime was related to a high-frequency meaning of the homograph, and on the other half of the trials, the prime was related to a low-frequency meaning. The concordant condition yielded evidence of semantic satiation across meaning frequency conditions (QUICK-FAST-SPEEDY), but the discordant condition only yielded evidence of semantic satiation when the prime activated a subordinate meaning of the homograph (HUNGER-FAST-SPEEDY).
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