Fronto-parietal mirror neuron system modeling: Visuospatial transformations support imitation learning independently of imitator perspective

Although the human mirror neuron system (MNS) is critical for action observation and imitation, most MNS investigations overlook the visuospatial transformation processes that allow individuals to interpret and imitate actions observed from differing perspectives. This problem is not trivial since accurately reaching for and grasping an object requires a visuospatial transformation mechanism capable of precisely remapping fine motor skills where the observer’s and imitator’s arms and hands may have quite different orientations and sizes. Accordingly, here we describe a novel neural model to investigate the dynamics between the fronto-parietal MNS and visuospatial processes during observation and imitation of a reaching and grasping action. Our model encompasses i) the inferior frontal gyrus (IFG) and inferior parietal lobule (IPL), regions that are postulated to produce neural drive and sensory predictions, respectively; ii) the middle temporal (MT) and middle superior temporal (MST) regions that are postulated to process visual motion of a particular action; and iii) the superior parietal lobule (SPL) and intra-parietal sulcus (IPS) that are hypothesized to encode the visuospatial transformations enabling action observation/imitation based on different visuospatial viewpoints. The results reveal that when a demonstrator executes an action, an imitator can reproduce it with similar kinematics, independently of differences in anthropometry, distance, and viewpoint. As with prior empirical findings, similar model synaptic activity was observed during both action observation and execution along with the existence of both view-independent and view-dependent neural populations in the frontal MNS. Importantly, this work generates testable behavioral and neurophysiological predictions. Namely, the model predicts that i) during observation/imitation the response time increases linearly as the rotation angle of the observed action increases but remain similar when performing both clockwise and counterclockwise rotation and ii) IPL embeds essentially view-independent neurons while SPL/IPS includes both view-independent and view-dependent neurons. Overall, this work suggests that MT/MST visuomotion processes combined with the SPL/IPS allow the MNS to observe and imitate actions independently of demonstrator-imitator spatial relationships.     

Varieties of cognitive penetration in visual perception

Is our perceptual experience a veridical representation of the world or is it a product of our beliefs and past experiences? Cognitive penetration describes the influence of higher level cognitive factors on perceptual experience and has been a debated topic in philosophy of mind and cognitive science. Here, we focus on visual perception, particularly early vision, and how it is affected by contextual expectations and memorized cognitive contents. We argue for cognitive penetration based on recent empirical evidence demonstrating contextual and top-down influences on early visual processes. On the basis of a perceptual model, we propose different types of cognitive penetration depending on the processing level on which the penetration happens and depending on where the penetrating influence comes from. Our proposal has two consequences: (1) the traditional controversy on whether cognitive penetration occurs or not is ill posed, and (2) a clear-cut perception–cognition boundary cannot be maintained.     

A systematic review on perceptual-motor calibration to changes in action capabilities

Perceptual-motor calibration has been described as a mapping between perception and action, which is relevant to distinguish possible from impossible opportunities for action. To avoid movement errors, it is relevant to rapidly calibrate to immediate changes in capabilities and therefore this study sought to explain in what conditions calibration is most efficient. A systematic search of seven databases was conducted to identify literature concerning changes in calibration in response to changes in action capabilities. Twenty-three papers satisfied the inclusion criteria. Data revealed that calibration occurs rapidly if there is a good match between the task that requires calibration and the sources of perceptual-motor information available for exploration (e.g. when exploring maximal braking capabilities by experiencing braking). Calibration can take more time when the perceptual-motor information that is available is less relevant. The current study identified a number of limitations in the field of perceptual-motor research. Most notably, the mean participant age in the included studies was between 18 and 33 years of age, limiting the generalizability of the results to other age groups. Also, due to inconsistent terminology used in the field of perceptual-motor research, we argue that investigating calibration in older cohorts should be a focus of future research because of the possible implications of impaired calibration in an aging society.     

Aesthetics as evaluative forms of agency to perceive and design reality: A reply to aesthetic realism

Following a naturalist-realist point of view, this paper attempts to contribute to the metaphysical question of whether or not reality includes aesthetics. During evolution, cognitive agents have constructed (goal-directed) regulatory abilities forming anticipatory contents in the form of feelings regarding opportunities for interaction. These feelings are considered to be the fundamental part of an evaluative or (what in this paper considered as aesthetic) behavior through which agents show a preference to aspects of their external world. Thus, ‘aesthetic’ denotes an agential behavior based on an organization of processes integrated in a form that identifies, evaluates, and compares sources of interaction-success or error in specific aspects of external reality. While agents approach the same aspects of reality as they all interact with the same world, our claim is that aesthetic normativity cannot be an objective feature of this reality. This model overcomes problems of correspondence in the sense that an agent's actions and thoughts ought to react to any pre-given (aesthetic) quality or norm, while at the same time it emphasizes the self-directedness of aesthetic behavior that enables the development of creative forms of cognition.     

Psychoneuroimmunology: A bio‐psycho‐social approach to health and disease

Since the early 1980s, the interdisciplinary field of psychoneuroimmunology has explored the complex bi‐directional interactions between brain, behavior, and the immune system. Taken together, this research has expanded the limits of the questions we can ask about the organism by challenging the biomedical paradigm of the immune system as predominantly “autonomous”. Psychoneuroimmunology has played a key role in establishing a biological basis for the ancient idea that the mind can play a role in health and disease. This article describes the development of psychoneuroimmunology and reviews a number of key findings concerning psychological phenomena of potential relevance to understanding brain‐behavior‐immune interactions, including learning, emotions, stress, and the role of sensory processes.     

“非典（SARS）”应激反应模式及其特征

对中国17个省市1016人面对“非典”疫情的应激反应作了调查。“高发病率区”和“其它地区”的比较发现,在SARS应激反应结构方程模型中,二者有显著差异。而在情绪障碍结构方程模型中,二者无显著差异。所建立的SARS应激反应结构方程理论模型揭示,急性的应激反应中,恐慌是最重要的内容,其次是防御反应,对疫情的认知则起了一种重要的调节、抑制的作用。抑郁和焦虑作为一个人心理健康的指数,对急性的应激反应产生一定影响,而抑郁与焦虑对急性应激反应有更大影响。社会支持作为一种缓冲器与调节器,对SARS应激反应有值得注意的影响。研究揭示了高应激反应者的特征。高恐慌者有高抑郁、焦虑和低社会支持的显著特征;高防御者则有显著的高抑郁焦虑的特征,社会支持无差异;高认知者明显地有低抑郁、高社会支持的特征。     

动作记忆SPT优势效应的理论探讨

操作条件下的记忆效果好于语词条件下记忆效果的现象被称为动作记忆SPT效应。以往研究先后提出非策略加工、多通道加工、动作编码及情景整合理论来解释SPT效应,但这些理论解释仍存在矛盾和分歧,并阻碍了当前动作记忆领域的研究进展。为了解决目前的理论困境,本文详细地阐述了各理论的核心内容、发展历程及其存在矛盾和分歧的原因,并提出应以加工过程与加工对象相结合的视角来建立新的理论模型,以进一步促进实证研究的展开。     

Introspection during visual search

Recent advances in the field of metacognition have shown that human participants are introspectively aware of many different cognitive states, such as confidence in a decision. Here we set out to expand the range of experimental introspection by asking whether participants could access, through pure mental monitoring, the nature of the cognitive processes that underlie two visual search tasks: an effortless “pop-out” search, and a difficult, effortful, conjunction search. To this aim, in addition to traditional first order performance measures, we instructed participants to give, on a trial-by-trial basis, an estimate of the number of items scanned before a decision was reached. By controlling response times and eye movements, we assessed the contribution of self-observation of behavior in these subjective estimates. Results showed that introspection is a flexible mechanism and that pure mental monitoring of cognitive processes is possible in elementary tasks.     

Investigating the subjective reports of rejection processes in the word frequency mirror effect

We sought to systematically investigate how participants subjectively classify the basis of their recognition memory judgments for low and high word frequency items. We found that participants more often reported rejection processes related to the increased perceived memorability for unstudied low word frequency items (relative to high word frequency items), rather than classifying their decision on a lack of familiarity. Experiment 2 replicated this pattern and demonstrated context variability and word frequency independently influenced the subjective classifications for correct rejections. Results of Experiment 3 revealed that these differences are dependent upon having experience with both low and high frequency items. Overall, these data suggest participants’ rejection of low frequency items is more strongly related to judgments of perceived memorability, but only when they are presented in the context of high frequency items. The results are discussed in relation to distinctiveness and expected memorability.     

I Spy With My Dominant Eye

The authors investigated how visual information from the nondominant and dominant eyes are utilized to control ongoing dominant hand movements. Across 2 experiments, participants performed upper-limb pointing movements to a stationary target or an imperceptibly shifted target under monocular-dominant, monocular-nondominant, and binocular viewing conditions. Under monocular-dominant viewing conditions, participants exhibited better endpoint precision and accuracy. On target jump trials, participants spent more time after peak limb velocity and significantly altered their trajectories toward the new target location only when visual information from the dominant eye was available. Overall, the results suggest that the online visuomotor control processes that typically take place under binocular viewing conditions are significantly influenced by input from the dominant eye.