Intentional and Skillful Neurons

Abstract

In the mid-1990s, there was a major neuroscientific discovery which might drastically alter sport science in general and philosophy of sport in particular. The discovery of mirror neurons by Giacomo Rizzolatti and colleagues in Parma, Italy, is a substantial contribution to understanding brains, movements, and humans. Famous neuroscientist V. S. Ramachandran believes the discovery of mirror neurons ‘will do for psychology what DNA did for biology’ (http://www.edge.org/3rd_culture/ramachandran/ramachandran_p1.html). Somehow mirror neurons have not received the deserved attention in the philosophy of sport, but perhaps now is the time to reflect on some implications and consequences. The discovery of mirror neurons may increase our insights about our ability to learn, understand, intend, and produce skillful motor actions. In this article I will first examine what mirror neurons are and how they function in monkeys and humans. Second, I will review some objections to the so-called mirror neuron theory of action understanding, and try to reconcile some of these objections. Third, I will inquire into some implications for philosophy, which I believe are also fundamental to several topics in the philosophy of sport. I will then try to relate some of the most interesting aspects of mirror neurons to recent debates in the philosophy of sport. Finally, I will speculate on what further neuroscientific research might teach us about the nature of being a moving subject.     

Speech-associated gestures, Broca’s area, and the human mirror system

Speech-associated gestures are hand and arm movements that not only convey semantic information to listeners but are themselves actions. Broca’s area has been assumed to play an important role both in semantic retrieval or selection (as part of a language comprehension system) and in action recognition (as part of a “mirror” or “observation–execution matching” system). We asked whether the role that Broca’s area plays in processing speech-associated gestures is consistent with the semantic retrieval/selection account (predicting relatively weak interactions between Broca’s area and other cortical areas because the meaningful information that speech-associated gestures convey reduces semantic ambiguity and thus reduces the need for semantic retrieval/selection) or the action recognition account (predicting strong interactions between Broca’s area and other cortical areas because speech-associated gestures are goal-direct actions that are “mirrored”). We compared the functional connectivity of Broca’s area with other cortical areas when participants listened to stories while watching meaningful speech-associated gestures, speech-irrelevant self-grooming hand movements, or no hand movements. A network analysis of neuroimaging data showed that interactions involving Broca’s area and other cortical areas were weakest when spoken language was accompanied by meaningful speech-associated gestures, and strongest when spoken language was accompanied by self-grooming hand movements or by no hand movements at all. Results are discussed with respect to the role that the human mirror system plays in processing speech-associated movements.     

Spontaneous facial mimicry in response to dynamic facial expressions

Based on previous neuroscientific evidence indicating activation of the mirror neuron system in response to dynamic facial actions, we hypothesized that facial mimicry would occur while subjects viewed dynamic facial expressions. To test this hypothesis, dynamic/static facial expressions of anger/happiness were presented using computer-morphing (Experiment 1) and videos (Experiment 2). The subjects' facial actions were unobtrusively videotaped and blindly coded using Facial Action Coding System [FACS; Ekman, P., & Friesen, W. V. (1978). Facial action coding system. Palo Alto, CA: Consulting Psychologist]. In the dynamic presentations common to both experiments, brow lowering, a prototypical action in angry expressions, occurred more frequently in response to angry expressions than to happy expressions. The pulling of lip corners, a prototypical action in happy expressions, occurred more frequently in response to happy expressions than to angry expressions in dynamic presentations. Additionally, the mean latency of these actions was less than 900 ms after the onset of dynamic changes in facial expression. Naive raters recognized the subjects' facial reactions as emotional expressions, with the valence corresponding to the dynamic facial expressions that the subjects were viewing. These results indicate that dynamic facial expressions elicit spontaneous and rapid facial mimicry, which functions both as a form of intra-individual processing and as inter-individual communication.     

Precision and power grip priming by observed grasping

The coupling of hand grasping stimuli and the subsequent grasp execution was explored in normal participants. Participants were asked to respond with their right- or left-hand to the accuracy of an observed (dynamic) grasp while they were holding precision or power grasp response devices in their hands (e.g., precision device/right-hand; power device/left-hand). The observed hand was making either accurate or inaccurate precision or power grasps and participants signalled the accuracy of the observed grip by making one or other response depending on instructions. Responses were made faster when they matched the observed grip type. The two grasp types differed in their sensitivity to the end-state (i.e., accuracy) of the observed grip. The end-state influenced the power grasp congruency effect more than the precision grasp effect when the observed hand was performing the grasp without any goal object (Experiments 1 and 2). However, the end-state also influenced the precision grip congruency effect (Experiment 3) when the action was object-directed. The data are interpreted as behavioural evidence of the automatic imitation coding of the observed actions. The study suggests that, in goal-oriented imitation coding, the context of an action (e.g., being object-directed) is more important factor in coding precision grips than power grips.     

言语与手部运动关系的研究回顾

言语与手部运动之间存在复杂的联系。该文总结了两类手部运动（伴随言语发生的手势运动和抓握运动）与言语之间关系的行为和脑科学研究成果。发现：（1）伴随言语产生的意义手势可促进言语加工,特别是词汇的提取过程;（2）观察手的抓握运动影响言语产生时唇的运动和声音成分;（3）对词语的知觉影响抓握运动的早期计划阶段;（4）言语产生可增加手运动皮层的兴奋性。作者由此认为,言语加工与手势间的联系不仅表现为神经通路的重叠和相互激活,而且可能在外显行为上也相互影响     

Interference Effects from Observed Movement in Parkinson's Disease

Previous research has demonstrated that Parkinson's disease patients have an increased susceptibility to response conflict. In the present study, the authors investigate whether Parkinson's patients have a similar sensitivity to interference from observed movements. In all, 10 patients and 10 controls performed horizontal and vertical arm movements while watching a video of either a person performing similar movements or a moving dot. Movements were performed in the same plane (congruent) and orthogonal to the observed movement (incongruent). The off-axis variance of movements was our index of interference. Although patients tended to exhibit more off-axis variability than did controls, both groups demonstrated similar congruence effects, with greater variance in incongruent conditions. These results indicated that increased susceptibility to interference in Parkinson's disease does not extend to interference from observed movements.     

First things first: infants make good use of the sympathetic rhythm of imitation,without reason or language

Research on communication with infants, including newborns, has demonstrated that imitations in great variety play many different parts, and with emotions of interest and pleasure. Matching another's actions may seek attention and provoke reply, accept or reject advances, express admiration or mockery. It seems best to regard imitating as one way that persons express and receive sympathetic awareness, one manifestation of the intuitive readiness to move rhythmically with others in games of sociability. Infants exhibit growing awareness of how to cooperate with others in gaining knowledge and skills. The intersubjective intuitions that are active early in life and that build trust and companionship must be significant for therapists who work with young patients for whom communication is difficult. Imitating and accepting imitations can build reciprocal confidence.     

Therapeutic action in psychoanalytic therapy with toddlers and parents

Psychotherapy with toddlers and parents can focus on promoting attachment, facilitating development and improving interactions. Some techniques provide guidance to the parents, whereas others interpret to them their unconscious fantasies or ‘ghosts’ contributing to the child’s disorder. A recent paper introduced a psychoanalytically oriented technique, which emphasised the therapist’s interaction with the child in the presence of the parent(s). The child was addressed about his/her unconscious motivations in the session and the feelings towards the therapist. Also, the parent’s transference onto the therapist was seen as a vehicle that might further the therapeutic process and was accordingly addressed. The present paper analyses the therapeutic action in such treatments. Whereas work with the parents resembles that of ordinary psychodynamic therapy, therapeutic action is more difficult to conceptualise regarding the toddler, whose understanding of verbal interpretations and the therapist’s dialogues with the parent is more limited than that of an adult. However, a clinical vignette demonstrates a toddler’s precise and swift reactions to communications from mother or therapist. The paper investigates evidence from neuroscience and psychological research as to which communicative channels – beyond words – toddlers might perceive and comprehend. In addition, it is claimed that the countertransference is key to explaining how the therapist understands such communication.     

Modulation of motor area activity during observation of unnatural body movements

The mirror neuron system (MNS) is activated when observing the actions of others. However, it remains unclear whether the MNS responds more strongly to natural bodily actions in the observer’s motor repertoire than to unnatural actions. We investigated whether MNS activity is modulated by the unnaturalness of an observed action by inserting short pauses in the middle of the action (0, 2, and 6 pauses; no-pause, pause-1, and pause-2 conditions, respectively). The results indicated that the number of pauses significantly affected motor area activity. Subsequent analyses revealed significant differences between the pause-1 and pause-2 conditions (P < 0.01), as well as the no-pause and pause-2 conditions (P < 0.05). There was significant activation in the pause-1 condition (P < 0.001), while significant deactivation was observed in the pause-2 condition (P < 0.05). These results indicate that MNS activity is modulated by the kinematic characteristics of the observed action. We suggest the possibility that a slightly deviated action may enhance the MNS activity during action observation, while a highly unnatural action would lead to a strong attenuation (deactivation) of activity in the MNS.