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Motor cognition

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The concept of motor cognition grasps the notion that cognition is embodied in action, and that the motor system participates in what is usually considered as mental processing, including those involved in social interaction.[1] The fundamental unit of the motor cognition paradigm is action, defined as the movements produced to satisfy an intention towards a specific motor goal, or in reaction to a meaningful event in the physical and social environments. Motor cognition takes into account the preparation and production of actions, as well as the processes involved in recognizing, predicting, mimicking, and understanding the behavior of other people. This paradigm has received a great deal of attention and empirical support in recent years from a variety of research domains including embodied cognition, developmental psychology, cognitive neuroscience, and social psychology.

Perception-action coupling

The idea of a continuity between the different aspects of motor cognition is not new. In fact, this idea can be traced to the work of the American psychologist William James and more recently, American neurophysiologist and Nobel prize winner Roger Sperry. Sperry argued that the perception-action cycle is the fundamental logic of the nervous system.[2] Perception and action processes are functionally intertwined: perception is a means to action and action is a means to perception. Indeed, the vertebrate brain has evolved for governing motor activity with the basic function to transform sensory patterns into patterns of motor coordination.

More recently, there is growing empirical evidence from cognitive psychology, developmental psychology, cognitive neuroscience, cognitive science, as well as social psychology which demonstrates that perception and action share common computational codes and underlying neural architectures. This evidence has been marshaled in the "common coding theory" put forward by Wolfgang Prinz and his colleagues at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig, Germany.[3] This theory claims parity between perception and action. Its core assumption is that actions are coded in terms of the perceivable effects (i.e., the distal perceptual events) they should generate.[4] Performing a movement leaves behind a bidirectional association between the motor pattern it has generated and the sensory effects that it produces. Such an association can then be used backward to retrieve a movement by anticipating its effects. These perception/action codes are also accessible during action observation. Other authors suggest a new notion of the phylogenetic and ontogenetic origin of action understanding that utilizes the motor system; the motor cognition hypothesis. This states that motor cognition provides both human and nonhuman primates with a direct, prereflexive understanding of biological actions that match their own action catalog.[5]

The discovery of mirror neurons in the ventral premotor and parietal cortices of the macaque monkey that fire both when it carries out a goal-directed action and when it observes the same action performed by another individual provides neurophysiological evidence for a direct matching between action perception and action production.[6] An example of such coupling is the ease with which people can engage in speech repetition when asked to shadow words heard in earphones.[7]

In humans, common neural activation during action observation and execution has been well documented. A variety of functional neuroimaging studies, using functional magnetic resonance imaging (fMRI), positron emission tomography, and magnetoencephalography have demonstrated that a motor resonance mechanism in the premotor and posterior parietal cortices occurs when participants observe or produce goal-directed actions.[8][9] Such a motor resonance system seems to be hard-wired, or at least functional very early in life.[10][11]

Shared representations between other and self

The common coding theory also states that perception of an action should activate action representations to the degree that the perceived and the represented action are similar.[12] As such, these representations may be shared between individuals. Indeed, the meaning of a given object, action, or social situation may be common to several people and activate corresponding distributed patterns of neural activity in their respective brains.[13] There is an impressive number of behavioral and neurophysiological studies demonstrating that perception and action have a common neuronal coding and that this leads to shared representations between self and others, which can lead to host of phenomena such as emotional contagion, empathy, social facilitation, and understanding others minds.[14]

Motor priming

One consequence of the functional equivalence between perception and action is that watching an action performed by another person facilitates the later reproduction of that action in the observer. For instance, in one study, participants executed arm movements while observing either a robot or another human producing the same or qualitatively different arm movements.[15] The results show that observing another human make incongruent movements interferes with movement execution but observing a robotic arm making incongruent movements does not.

Social facilitation

The fact that the observation of action can prime a similar response in the observer, and that the degree to which the observed action facilitates a similar response in the observer cast some light into the phenomenon called social facilitation, first described by Robert Zajonc, which accounts for the demonstration that the presence of other people can affect individual performance.[16] A number of studies have demonstrated that watching facial expression of emotions prompts the observer to resonate with the state of another individual, with the observer activating the motor representations and associated autonomic and somatic responses that stem from the observed target.[17]

Mental state understanding

Humans have a tendency to interpret the actions of others with respect to underlying mental states. One important question is whether the perception-action matching mechanism and its product, shared motor representations, can account (or to what extent it does) for the attribution of mental states to others (often dubbed theory of mind mechanism). Some authors have suggested that the shared representations network that stems from the perception-action matching mechanism may support mental state attribution via covert (i.e., unconscious) mental simulation.[18] In contrast, some other scholars have argued that the mirror system and the theory of mind system are two distinct processes and it’s likely that the former cannot account for mental state understanding.[19][20]

Cognition and action

To understand the relationship between cognition and action, Cherie L. Gerstadt, Yoon Joo Hong, and Adele Diamond of the University of Pennsylvania carried out a Stroop like day-night test [21] on children between the age of 3 - 7 years. They tested one hundred and sixty children on a task that requires inhibitory control of action plus learning and remembering two rules. They found that the response latency decreased from 3 to 4 years. They concluded that the requirement to learn and remember two rules is not in itself sufficient to account for the poor performance of the younger children.[22] Vygotsky’s Theory of Cognitive Development tells us that children are more likely to be cognitively advanced if they are more physically active. This is because playing and physical activity allows children to branch out into new situations and helps them learn strategies for learning new information[23]

Reasoning

A series of experiments demonstrated the interrelation between motor experience and high-level reasoning. For example, although most individuals recruit visual processes when presented with spatial problems such as mental rotation tasks [24] motor experts favor motor processes to perform the same tasks, with higher overall performance.[25] A related study showed that motor experts use similar processes for the mental rotation of body parts and polygons, whereas non-experts treated these stimuli differently.[26] These results were not due to underlying confounds, as demonstrated by a training study that showed mental rotation improvements after a one-year motor training, compared with controls.[27] Similar patterns were also found in working memory tasks, with the ability to remember movements being greatly disrupted by a secondary verbal task in controls and by a motor task in motor experts, suggesting the involvement of different processes to store movements depending on motor experience, namely verbal for controls and motor for experts.[28]

Mirror neurons

Recent discoveries in the field of social neuroscience have heavily implicated mirror neurons and their related systems as a possible neurological basis for social cognition specifically factors that involve motor cognition. In chimpanzees (the closest living relative to humans) mirror neuron systems have been shown to be highly active when the ape is observing another individual (ape or human) perform a physical action such as grasping, holding, or hitting.[29] Mirror neuron regions in the ventral premotor cortex, dorsal premotor cortex, and intraparietal cortex have been found to activate in humans for similar situations of observing an individual perform one of but not limited to the aforementioned physical tasks.[30] The activation of the mirror neuron system is automatic and goes beyond recognition of simple physical actions but is thought to be the reason why an individual is able to guess and understand another individual's actions.[29][30]

fMRI studies in humans have been gathering evidence that mirror neurons are responsible for the "Physical to self-mapping"[31] In studies where participants had to identify their own face, right hemispheric mirror neurons activated indicating responsibility for the ability of one to represent one’s own physical actions/states. These same areas also fire when the individual views others performing physical actions such as grasping or tearing.[31][32] This activation implies that there is a unique neural connection going on for an individual. Thus the mirror neuron system allows for a bridge between the self to the actions of others. This has been theorized to enable the understanding of intention or the goals of others.[33][34] A study by Spunt and Liberman (2013) used an fMRI study to observe mirror neurons in the brain. Participants observed a video of an action being performed under a high or low cognitive load. While watching, they were instructed to observe why the action was being performed, what action was being performed, or how the action was being performed. The end result provided direct evidence for activation and more importantly automaticity of the mirror neurons in the dorsal premotor cortex, ventral premotor cortex, and anterior Intraparietal sulcus.[30]

Although a large amount of supporting evidence indicates that mirror neurons activate in situations where one is analyzing oneself to the actions of others,[33] there is still debate as to whether these activations should be interpreted as intentional understanding. Shannon Spaulding (2013) argues that the neuroscientists who offer up mirror neurons as a physiological answer to social cognition are misinterpreting their results and not using the correct philosophical definitions of goal and intention. Rather than being interchangeable or one leading to the other, she argues they need to be thought of as two separate actions.[34]

The discovery of the link between mirror neurons and social cognition provides further links to a neurological basis found in other social phenomena such as social learning theory, empathy, and observational learning.[29][35]

See also

References

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  2. ^ Sperry, R.W. (1952). "Neurology and the mind-brain problem". American Scientist. 40 (78): 291–312. PMID 18592054.
  3. ^ Prinz, W. (1997). "Perception and action planning". European Journal of Cognitive Psychology. 9 (2): 129–154. doi:10.1080/713752551.
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  35. ^ Reardon, Sara (2014-02-25). "Monkey brains wired to share". Nature. 506 (7489): 416–417. Bibcode:2014Natur.506..416R. doi:10.1038/506416a. ISSN 0028-0836. PMID 24572401.

Further reading

  • Hatfield, E.; Cacioppo, J.; Rapson, R. (1994). Emotional Contagion. New York: Cambridge Press.
  • Jeannerod, M. (1997). The cognitive neuroscience of action. Wiley-Blackwell.
  • Jeannerod, M. (2006). Motor Cognition: What Actions Tell the Self. Oxford University Press.
  • Morsella, E.; Bargh, J. A.; Gollwitzer, P. M., eds. (2009). Oxford Handbook of Human Action. New York: Oxford University Press.
  • Markman, K. D.; Klein, W. M. P.; Suhr, J. A., eds. (2008). The Handbook of Imagination and Mental Simulation. New York: Psychology Press.
  • Thelen, E. (1995). "Motor development: A new synthesis". American Psychologist. 50 (2): 79–95. doi:10.1037/0003-066x.50.2.79. PMID 7879990.
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