Abstract
I have reviewed studies on neural responses to pictured actions in the action observation network (AON) and the cognitive functions of these responses. Based on this review, I have analyzed the specific representational characteristics of action photographs. There has been consensus that AON responses provide viewers with knowledge of observed or pictured actions, but there has been controversy about the properties of this knowledge. Is this knowledge causally provided by AON activities or is it dependent on conceptual processing? What elements of actions does it refer to, and how generalized or specific is it? The answers to these questions have come from studies that used transcranial magnetic stimulation (TMS) to stimulate motor or somatosensory cortices. In conjunction with electromyography (EMG), TMS allows researchers to examine changes of the excitability in the corticospinal tract and muscles of people viewing pictured actions. The timing of these changes and muscle specificity enable inferences to be drawn about the cognitive products of processing pictured actions in the AON. Based on a review of studies using TMS and other neuroscience methods, I have proposed a novel hypothetical account that describes the characteristics of action photographs that make them effective cues to social perception. This account includes predictions that can be tested experimentally.
Highlights
I have reviewed studies on neural responses to pictured actions in the action observation network (AON) and the cognitive functions of these responses
I will give an overview of findings on the cognitive products of the activations in the AON, coming primarily from studies in which live actions or video clips of actions were used as stimuli
The present review is based on the following assumptions: Action photos convey to viewers a similar particular social perception as observing live actions
Summary
The AON includes brain areas that do not contain mirror neurons but are involved in the processing of action-related visual information [10,12,13] (see Table 1). 2008 [27]; Canessa et al, 2012 [24]; Ferretti et al, 2005 [28]; Gu & Han, 2007 [29]; Hafri et al, 2017 [15]; Hermsdörfer et al, 2001 [20]; Kolesar et al, 2017 [21]; Ogawa & Inui, 2011 [30]; Proverbio et al, 2009 [18]; Redouté et al, 2000 [31]; Wehrum et al, 2013 [32]. The proposed characteristics of action photos and cognitive processes correspond to predictions that can be tested experimentally
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