Switch costs and the operand-recognition paradigm

Experimental research in cognitive arithmetic frequently relies on participants’ self-reports to discriminate solutions based on direct memory retrieval from use of procedural strategies. Given concerns about the validity and reliability of strategy reports, Thevenot et al. in Mem Cogn 35:1344–1352, (2007) developed the operand-recognition paradigm as an objective measure of arithmetic strategies. Participants performed addition or number comparison on two sequentially presented operands followed by a speeded operand-recognition task. Recognition times increased with problem size following addition but not comparison. Thevenot et al. argued that the complexity of addition strategies increases with problem size. A corresponding increase in operand-recognition time occurs because, as problem size increases, working memory contains more numerical distracters. However, because addition is substantially more difficult than comparison, and difficulty increases with problem size for addition but not comparison, their findings could be due to difficulty-related task-switching costs. We repeated Thevenot et al. (Experiment 1) but added a control condition wherein participants performed a parity (odd or even) task instead of operand recognition. We replicated their findings for operand recognition but found robust, albeit smaller, effects of addition problem size on parity judgements. The results indicate that effects of strategy complexity in the operand-recognition paradigm are confounded with task-switching effects, which complicates its application as a precise measure of strategy complexity in arithmetic.     

Determining Relationships Between Physical Health and Spiritual Experience,Religious Practices,and Congregational Support in a Heterogeneous Medical Sample

Previous research indicates that increased religiosity/spirituality is related to better health, but the specific nature of these relationships is unclear. The purpose of this study was to determine the relationships between physical health and spiritual belief, religious practices, and congregational support using the Brief Multidimensional Measure of Religiousness/Spirituality and the Medical Outcomes Scale Shortform-36. A total of 168 participants were surveyed with the following medical disorders: Cancer, Spinal Cord Injury, Traumatic Brain Injury, and Stroke, plus a healthy sample from a primary care setting. The results show that individuals with chronic medical conditions do not automatically turn to religious and spiritual resources following onset of their disorder. Physical health is positively related to frequency of attendance at religious services, which may be related to better health leading to increased ability to attend services. In addition, spiritual belief in a loving, higher power, and a positive worldview are associated with better health, consistent with psychoneuroimmunological models of health. Practical implications for health care providers are discussed.     

Lactate threshold prediction by blood glucose and rating of perceived exertion in people with type 2 diabetes

The validity of rating of perceived exertion (RPE) in predicting lactate threshold during an incremental test was analyzed in 15 men with type 2 diabetes (M age = 53.4 yr., SD = 12.9). Blood glucose, lactate, and minute ventilation (VE)/VO2 responses identified the lactate, ventilatory, and glucose thresholds. Workloads (W) corresponding to RPEs 12, 13, 14, and 15 were determined. Second-order polynomials fit to VE/W and [lac]/W ratios corresponding to RPEs of 9-10, 12-13, and 16-17 also identified workloads above which there was an overproportional increase in VE and [lac]. These workload breakpoints did not differ, although at RPE 12 underestimated and at RPE 15 overestimated lactate threshold. RPE 13 and 14 and the responses of VE/W and [lac]/W to submaximal exercise accurately predicted lactate threshold.     

Animalism and the varieties of conjoined twinning

We defend the view that we are not identical to organisms against the objection that it implies that there are two subjects of every conscious state one experiences: oneself and one’s organism. We then criticize animalism—the view that each of us is identical to a human organism—by showing that it has unacceptable implications for a range of actual and hypothetical cases of conjoined twinning: dicephalus, craniopagus parasiticus, and cephalopagus.     

Comparison of blocking strategies informed by precursor assessment to decrease pica

Pica is dangerous behavior and often maintained by automatic reinforcement. We conducted a latency functional analysis (FA) using safe consumption items to verify that pica was maintained in part by automatic reinforcement and exclude participants for whom pica was likely maintained solely by attention. Next, we identified precursors to pica through a probability analysis and conducted a brief blocking assessment for participants' whose pica occurred in the alone and attention conditions of the FA. Finally, we compared blocking precursors with pica, touching an inedible item and the pica itself. Results showed that five of the six participants' pica was likely maintained by automatic reinforcement, and pica decreased during the brief blocking assessment for three of four participants. Results of the blocking comparison showed that blocking behaviors earlier in the response hierarchy was as effective as only blocking pica attempts for two participants and more effective for one participant.     

Do adolescents’ self-concepts moderate the relationship between STEM stereotypes and motivation?

Professionals in science, technology, engineering, and math (STEM) are often stereotyped as geniuses and nerds (e.g., socially awkward). These stereotypes may demotivate some individuals from pursuing or remaining in STEM. However, these beliefs may enhance motivation among individuals who feel that they fit in with the stereotype. Guided by balanced identity theory and expectancy-value theory, our study investigated the effect of trait-based stereotypes about people in STEM among a sample of 256 U.S. high school students (M_age?=?16, 59% girls, 65% Asian, 15% Latinx, 10% White). We assessed students’ trait-based nerd and genius stereotypes about STEM and related self-concepts as well as their STEM motivation (competence and value beliefs). Consistent with balanced identity theory, the effect and direction of endorsing nerd-genius stereotypes was moderated by a student’s own self-concepts. Endorsing stereotypes was negatively related to motivation—but only among those low in the related self-concept. Among those high in related self-concepts (e.g., high in nerd-genius self-concept), endorsing STEM stereotypes (e.g., STEM is for geniuses) was unrelated to STEM motivation. Girls, underrepresented students of color, and potential first-generation college students may especially be negatively affected by the stereotypes due to a greater likelihood that these stereotypes will be incongruent with their self-concepts. Thus, trait-based stereotypes about people in STEM may perpetuate current gaps in STEM.

     

Adults’ strategy choices for simple addition: Effects of retrieval interference

Simple addition (e.g., 3 + 2, 7 + 9) may be performed by direct memory retrieval or by such procedures as counting or transformation. The distribution of associations (DOA) model of strategy choice (Siegler, 1988) predicts that procedure use should increase as retrieval interference increases. To test this, 100 undergraduates performed simple addition problems, either after blocks of simple multiplication (high-interference context) or after blocks of simple division problems (low-interference context). Addition took longer and was more error prone after multiplication; in particular, there were more multiplication confusion errors on the relatively easy, small-number addition problems (e.g., 3 + 2 = 6, 4 + 3 = 12), but not on the more difficult, large-number additions. Consistent with the DOA, participants reported greater use of procedures for addition after multiplication, but more so for small addition problems. The findings demonstrate that adults’ use of procedural strategies for simple addition is substantially influenced by retrieval interference.