When competition merges people's behavior: Interdependency activates shared action representations

Previous research suggests that friendly, cooperative situations cause one to integrate a co-actor's actions into one's own action system. Departing from an interdependency perspective, we predict the activation of shared action representations even in hostile, competitive situations as a result of attending to the intentions of the co-actor. To test this, in Experiment 1 we manipulated the interdependency between actor and co-actor in a joint Simon task and observed a stronger activation of shared action representations in a cooperative as well as competitive context compared to an independent context. Experiment 2 replicated the competitive context effect on activation of shared action representations and provided additional evidence for the mediating role of attending to others’ intentions by taking into account the individual tendency to attend to others’ intentions. Together, our findings suggest that interdependency merges people's behavior even in competitive contexts, which we argue encourage actors to attend to others’ intentions.     

Rats’ visual-spatial working memory: New object choice accuracy as a function of number of objects in the study array

When rats had to find new (jackpot) objects for rewards from among previously sampled baited objects, increasing the number of objects in the sample (study) segment of a trial from 3 to 5 and then to 7 (Experiment 1) or from 3 to 6 and 9 (Experiments 2 and 3) or from 6 to 9 and 12 (Experiment 4) did not reduce rats’ test segment performance. Increasing study segment size improved test segment performance contrary the limited-capacity hypothesis concerning rats’ spatial working memory. This effect occurred when objects either differed visually (Experiments 1, 2, 4) or only by odor (Experiment 3). Rats performed no better than chance in finding a jackpot on their first choice from among three visually different objects in Experiments 1 and 2. Furthermore, results from Experiments 2 and 3 indicate that differences in the probability of finding a jackpot by chance in Experiment 1 were not responsible for failure to find the predicted inverse relationship. Results from Experiment 4 indicate that those from Experiments 2 and 3 were not solely due to size of test arrays. We discussed whether our findings could be attributed to innate foraging or perceptual isolation processes during testing or to perceptual encoding processes during exposure to study segment arrays.     

Does text–picture integration also occur with longer text segments?

Text–picture integration is one of the most important cognitive processes when reading illustrated text. There is empirical evidence that text‐picture integration takes place when learning with pictures combined with single sentences. The present experiment investigated whether text–picture integration also takes place when the single sentences are embedded into longer text segments and hence when materials become more complex. In a within‐subjects design, 43 participants read an illustrated story, in which the different combinations of general and specific sentences and pictures, respectively, were embedded. In line with previous findings, participants were more likely to falsely recognize specific versions of the sentences after having studied their general versions combined with specific pictures. Thus, the experiment shows that text–picture integration also occurs when learners have to read longer text passages combined with pictures.     

National Identity and Attitude Toward Foreigners in a Multinational State: A Replication

An analysis of the 1995 Belgian General Election Survey indicates that the bipolar national identity variable, which contrasts citizens who identify exclusively with the Belgian nation with those who identify exclusively with the Flemish or Walloon subnation, measures not only the direction but also the intensity of national feelings. Respondents who are located at the middle of the scale tend to have a weak identification with both the nation and the subnation. On the basis of a structural equations modeling approach involving a test of the construct equivalence in the two regions and a control for agreeing-response bias, it is shown that the bipolar national identity variable and attitude toward foreigners are inversely related in Flanders and Wallonia. In Flanders, citizens with a strong subnational identification tend to have a negative attitude toward foreigners; those with a strong Belgian identification are more positive. This relationship became more pronounced after controlling for the respondents' level of education. In Wallonia, a reverse but less pronounced relationship was found. These findings support the hypothesis that the relationship between the variables of national identity and attitude toward foreigners is not intrinsic, but is at least partly determined by the social representation of the nation.     

试析联结主义范式对婴儿发展的解释

用联结主义范式作为解释婴儿发展的机制已成为当前认知发展研究的新趋势。本文以婴儿分类和客体永久性为范例,分析了这一范式在解释婴儿发展方面的理论潜力及不足。     

The efficiency of binding spontaneous trait inferences to actors’ faces

Three experiments tested the hypothesis that the process of binding spontaneous trait inferences (STIs) to actors’ representations is relatively independent of attentional resources. Participants were presented with faces paired with single behaviors. Binding of STIs to actors was revealed by a higher false recognition of implied traits paired with actors’ faces than of implied traits randomly paired with other familiar faces. This effect replicated when each face-behavior pair was presented for 2 s (Experiment 1), when the processing of the information was shallow (Experiment 2), and when participants performed a secondary task during the presentation of behaviors (Experiment 3). Experiment 4 showed that explicit on-line trait judgments of the actor, but not explicit behavior judgments, predicted the false recognition of implied traits in the context of the actor. The possibility that the process of binding STIs to actors’ representations is automatic is discussed.     

多目标追踪的神经机制

多目标追踪任务是研究动态场景中视觉注意加工机制常用的范式。自1998年开始对多目标追踪神经机制的影像学研究以来, 研究者采用ERP和fMRI等技术对多目标注意追踪所涉及的神经电生理活动和脑功能区激活方面开展了大量研究。ERP研究发现, 追踪过程持续的ERP脑电成分如N2pc、CDA的波幅与注意追踪负荷有关, 并且出现在目标与非目标上的探测刺激诱发的脑电成分如N1、P1波幅的差异可反映注意资源的分配, 具体为目标在追踪过程中得到了激活, 而非目标受到了抑制。fMRI研究比较一致地发现了顶叶(包括前顶内沟、后顶内沟、顶上小叶)、背外侧额叶皮层等在注意追踪中的强烈激活。其中顶内沟主要与注意负荷有关, 顶内沟的活动水平直接决定了观察者注意追踪的行为表现。而顶上小叶可能更多的负责注意转移。背外侧额叶皮层可能负责追踪时的感觉运动预测过程。     

Object recognition and Random Image Structure Evolution

We present a technique called Random Image Structure Evolution (RISE) for use in experimental investigations of high-level visual perception. Potential applications of RISE include the quantitative measurement of perceptual hysteresis and priming, the study of the neural substrates of object perception, and the assessment and detection of subtle forms of agnosia. In simple terms, RISE involves the measurement of perceptual and/or neural responses as visual stimuli are systematically transformed—in particular, as recognizable objects evolve from, then dissolve into, randomness. Points along the sequences corresponding to the onset and offset of subjects’ percepts serve as markers for quantitatively and objectively characterizing several perceptual phenomena. Notably, these image sequences are created in a manner that strictly controls a number of important low-level image properties, such as luminance and frequency spectra, thus reducing confounds in the analysis of high-level visual processes. Here we describe the RISE paradigm, report the results of a few basic RISE experiments, and discuss a number of experimental and clinical applications of this approach.     

Consciously monitored grasping is vulnerable to perceptual intrusions

The idea of functional differentiation between vision-for-action and vision-for-perception has been supported by evidence from different domains. According to this account, perception is based on consciously accessible, relative representations, whereas vision-for-action is performed in an analytic, automatic manner. Support for this idea comes from studies that showed that unlike perception, grasping movements are refractory to illusions and to Weber’s law. Yet, interactions between the systems may occur when an action is performed in a less automated fashion. To test this idea, we asked participants to monitor their fingers apertures in flight and to halt their movement for a short duration when they felt that their aperture reached a maximum amount. The results showed that movements in the monitored condition were biased by the Ponzo illusion and showed atypical adherence to Weber's law. These results show that action and perception are more likely to interact when movements are performed in a controlled manner.     

Visual perception of complex shape-transforming processes

Morphogenesis—or the origin of complex natural form—has long fascinated researchers from practically every branch of science. However, we know practically nothing about how we perceive and understand such processes. Here, we measured how observers visually infer shape-transforming processes. Participants viewed pairs of objects (‘before’ and ‘after’ a transformation) and identified points that corresponded across the transformation. This allowed us to map out in spatial detail how perceived shape and space were affected by the transformations. Participants’ responses were strikingly accurate and mutually consistent for a wide range of non-rigid transformations including complex growth-like processes. A zero-free-parameter model based on matching and interpolating/extrapolating the positions of high-salience contour features predicts the data surprisingly well, suggesting observers infer spatial correspondences relative to key landmarks. Together, our findings reveal the operation of specific perceptual organization processes that make us remarkably adept at identifying correspondences across complex shape-transforming processes by using salient object features. We suggest that these abilities, which allow us to parse and interpret the causally significant features of shapes, are invaluable for many tasks that involve ‘making sense’ of shape.