An update on the search for symmetry in nonhumans

Sidman et al.'s (1982) failure to find evidence for symmetry (bidirectional associations between stimuli) in monkeys and baboons set the stage for decades of work on emergent relations in nonhumans. They attributed the failure to the use of procedures that did not (1) promote stimulus control based on the relation between the sample and correct comparison and (2) reduce control by irrelevant stimulus features. Previous reviews of symmetry in nonhumans indicated that multiple exemplar training and successive matching might encourage appropriate stimulus control. This review examined 16 studies that investigated symmetry in 94 subjects, including pigeons, rats, capuchin monkeys, and baboons. Several studies used alternative training procedures to minimize sources of irrelevant stimulus control, and many combined multiple exemplar training with other procedural modifications. Symmetry was observed in approximately 30% of subjects. Studies that reported the strongest evidence for symmetry used successive matching-to-sample procedures that included training on both symbolic and identity relations, and studies finding mixed evidence employed alternative methods. These studies highlight the challenge in creating training procedures that promote symmetry and the need to assess the underlying sources of control on positive demonstrations.     

The effects of listener training on the development of analogical reasoning

We evaluated the effects of listener training on the emergence of analogical reasoning, as measured via equivalence‐equivalence and explored the role of verbal behavior when solving analogy‐type tasks. We taught 18 college students to select component stimuli from 2 classes, labeled “vek” and “zog,” and evaluated tacts and relational responding in the presence of baseline (AB and BC), symmetry (BA and CB), and transitivity (AC and CA) compounds. In Experiment 1, 5 out of 6 participants passed analogy tests, but none of them engaged in the relational tacts “same” and “different” during tact tests, possibly due to lack of instructional control. A change in instructions during Experiment 2 produced relational tacts in 4 of 6 participants, and 5 participants passed analogy tests. In Experiment 3, we implemented a talk‐aloud procedure to determine if the participants were emitting relational tacts during analogy tests. All 6 participants tacted stimuli relationally and engaged in problem‐solving statements to solve analogy tests. Results from these studies suggest that listener and speaker behavior in the form of relational tacts and other problem‐solving statements influenced the participants' equivalence–equivalence performance.     

On the origins of emergent differential sample behavior

Two experiments evaluated the source(s) of emergent differential sample behavior in pigeons. Initially, pigeons learned two-sample, two-alternative symbolic matching in which different patterns of sample responding were required to produce the comparisons. Afterwards, two other samples nominally identical to the comparisons were added to the matching task. On new-sample trials, completion of either sample-response requirement produced comparison alternatives which were either the same as or different from the alternatives on the familiar-sample trials. Differential responding to the new samples developed only when the comparisons were the same as the familiar samples. The results are consistent with acquired sample equivalence and adventitious reinforcement accounts of emergent sample behavior and are inconsistent with bidirectional transfer (symmetry) between the response patterns explicitly required to the originally trained (familiar) samples and the subsequently reinforced comparisons.     

道德概念垂直空间隐喻理解中的映射:双向性及不平衡性

通过4个实验考察道德概念垂直空间隐喻理解中的映射机制和特征。实验1采用空间Stroop范式,发现被试判断完道德词后,对判断随后呈现在屏幕上方或下方字母的反应时的差异不显著,没有发现词汇类型对空间位置的影响。实验2采用有意识迫选法,要求被试出声读出屏幕中央的道德词后,对屏幕上方或下方的希腊语非词进行二择一迫选,发现被试读出道德词后倾向于选择屏幕上方的非词,读出不道德词后倾向于选择屏幕下方的非词。实验3仍采用Stroop范式,发现被试做出空间"上"的判断后,对随后道德词的词义判断反应时显著快于不道德词,做出空间"下"的判断后,对不道德词的反应时显著快于道德词。实验4探讨空间位置是否会对判断人物的道德性产生影响,结果发现被试倾向于认为屏幕上方的人物是道德的,而屏幕下方的人物是不道德的。4个实验的结果表明,在道德概念垂直空间隐喻的理解中,映射的方式是灵活的、双向的,既可以由始源域向目标域映射,也可以由目标域向始源域映射,但两个方向上的映射力量是不平衡的。     

Predicting Bidirectional Intimate Partner Violence: Demographic and Historical Factors That Influence Initiating Threats or Use of Violence by IPV Victims

Using data from the National Violence Against Women Survey, this study explored the role of gender and other demographic and historical factors that influence initiating threats or use of violence among a sample of intimate partner violence (IPV) victims—an element of bidirectional violence. For this study, involvement in a relationship marked by bidirectional violence was defined as an affirmative response to this question: Were you the first person to use/threaten physical force? after respondents self-identified as IPV victims. The hypothesized model to predict initiating threats or use of violence among male victims was not significant, but marital status, income, employment status, and childhood victimization experiences did significantly predict female behavior. Age, race, education, alcohol use, drug use, and posttraumatic stress disorder (PTSD) symptoms were not useful in explaining model variance for men or women. The rates of perpetration were equivalent for males and females; however, these findings suggest that gender is still an important context to consider when theorizing about bidirectional IPV.     

Translational research in behavior analysis: historical traditions and imperative for the future

"Pure basic" science can become detached from the natural world that it is supposed to explain. "Pure applied" work can become detached from fundamental processes that shape the world it is supposed to improve. Neither demands the intellectual support of a broad scholarly community or the material support of society. Translational research can do better by seeking innovation in theory or practice through the synthesis of basic and applied questions, literatures, and methods. Although translational thinking has always occurred in behavior analysis, progress often has been constrained by a functional separation of basic and applied communities. A review of translational traditions in behavior analysis suggests that innovation is most likely when individuals with basic and applied expertise collaborate. Such innovation may have to accelerate for behavior analysis to be taken seriously as a general-purpose science of behavior. We discuss the need for better coordination between the basic and applied sectors, and argue that such coordination compromises neither while benefiting both.     

An inexpensive and automated method for presenting olfactory or tactile stimuli to rats in a two-choice discrimination task

An inexpensive and automated method for presentation of olfactory or tactile stimuli in a two-choice task for rats was implemented with the use of a computer-controlled bidirectional motor. The motor rotated a disk that presented two stimuli of different texture for tactile discrimination, or different odor for olfactory discrimination. Because the solid olfactory stimuli were placed outside the chamber in metal pods with a mesh at front for odor sampling, "washout" of odors between trials was not necessary. To avoid differential auditory cues from motor rotation, the stimuli were arranged such that on each trial the motor always rotated exactly one quarter revolution (in 1 s), left or right, to present the next stimulus at trial start. To illustrate the use of the equipment, 2 rats were trained on tactile discrimination and 2 rats on olfactory discrimination. The rats sampled the stimulus on the disk through a port on the back wall by sniffing at it (olfactory) or touching it (tactile). The task was a go-left/go-right discrimination with the stimulus on the disk being discriminative for which lever provided reinforcement. The rats reached a stable level above 90% correct after 21 and 32 training sessions for tactile and olfactory discrimination, respectively. The article outlines how the equipment was constructed from low-cost components. Inputs from and outputs to the equipment were implemented through the parallel port of a personal computer without the use of a commercial interface board. The method of automated and low-cost presentation of olfactory or tactile stimuli should be of use for a variety of experimental situations such as matching-to-sample and cross-modal discrimination.     

FAMILY CONFLICT MODERATES EARLY PARENT–CHILD BEHAVIORAL TRANSACTIONS

The reciprocal transactions that shape early parent–child relationships are influenced by contextual stress, such as family conflict. Although family conflict is a salient stressor to the family system, few studies have considered how parent–child transactions vary according to exposure to family conflict. The present study examined how family conflict alters early parent–child behavioral transactions. We utilized three waves of data from a multisite longitudinal study of low‐income families (N = 2, 876), child age 14 months, 24 months, and 36 months, to identify behavioral transactions of positive and negative maternal (supportiveness, negative regard) and child (engagement, negativity) behaviors. Results indicated that family conflict at 14 months diminished the positive association between maternal supportiveness and child engagement, and amplified the inverse association between maternal negativity and child engagement. Family conflict at 14 months also was associated with increased stability of child negativity and subsequent increased maternal negative regard at 36 months, in part via increases in 24‐month child negativity. In sum, family conflict occurring early in childhood predicted and moderated behavioral transactions between young children and their mothers.     

道德概念垂直空间隐喻的心理现实性及双向映射

研究以大学生为被试,通过三个实验考察道德概念垂直空间隐喻的心理现实性及双向映射。实验1采用面孔图片和道德词汇的匹配记忆任务发现,道德词出现在上方时,被试对词语和面孔的匹配再认率更高;不道德词出现在下方时,被试对词语和面孔的匹配再认正确率更高。结果证实了道德概念的垂直空间隐喻的心理现实性。实验2通过道德评价任务发现,被试倾向于把空间上方出现的面孔评价为更加道德,把在空间下方的面孔评价为更加不道德,证实了空间信息对道德评价的影响。实验3采用带有空间位置信息的词语记忆任务。结果表明,在位置判断任务中,被试更多地将道德词判断为在上方出现过,更多地将不道德词判断为在下方出现过。结果显示词语的道德色彩影响了空间信息判断。研究结论:传统道德概念垂直空间隐喻存在心理现实性;道德概念和空间概念之间存在双向映射。     

一把双刃剑：胰岛素样生长因子-I的双向作用

胰岛素样生长因子-I（insulin--likegrowthfactor—I,IGF—I）作为一种有丝分裂原,一方面可以促进生长、减少胰岛素抵抗、治疗生长激素不敏感综合征、心衰及肾衰等;另一方面,高水平的IGF—I却又与前列腺癌、乳腺癌及结肠直肠癌等相关。同一种活性物质却具有差异如此大的作用,本文将综述并从哲学的思雏和视角认识IGF—I的双向作用。