Extrastriate body area underlies aesthetic evaluation of body stimuli
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Humans appear to be the only animals to have developed the practice and culture of art. This practice presumably relies on special processing circuits within the human brain associated with a distinct subjective experience, termed aesthetic experience, and preferentially evoked by artistic stimuli. We assume that positive or negative aesthetic judgments are an important function of neuroaesthetic circuits. The localisation of these circuits in the brain remains unclear, though neuroimaging studies have suggested several possible neural correlates of aesthetic preference. We applied repetitive transcranial magnetic stimulation (rTMS) over candidate brain areas to disrupt aesthetic processing while healthy volunteers made aesthetic preference judgments between pairs of dance postures, or control non-body stimuli. Based on evidence from visual body perception studies, we targeted the ventral premotor cortex (vPMC) and extrastriate body area (EBA), in the left and right hemispheres. rTMS over EBA reduced aesthetic sensitivity for body stimuli relative to rTMS over vPMC, while no such difference was found for non-body stimuli. We interpret our results within the framework of dual routes for visual body processing. rTMS over either EBA or vPMC reduced the contributions of the stimulated area to body processing, leaving processing more reliant on the unaffected route. Disruption of EBA reduces the local processing of the stimuli and reduced observers’ aesthetic sensitivity. Conversely, disruption of the global route via vPMC increased the relative contribution of the local route via EBA and thus increased aesthetic sensitivity. In this way, we suggest a complementary contribution of both local and global routes to aesthetic processing.
KeywordsNeuroaesthetic Aesthetic perception Body perception Transcranial magnetic stimulation Extrastriate body area Premotor cortex
We are grateful to Deborah Bull, Tom Sapsford, Mavin Khoo and Matteo Candidi for advice and assistance. This work was supported by grants from the Economics and Social Science Research Council (ESRC—PTA-026-27-1587), City University London Fellowship, and Ramon y Cajal Fellowship to BC-M, a research fellowship of the German Academic Exchange Service (DAAD) to GO, grants from the IRCCS “E. Medea” (Ricerca Corrente 2009, Italian Ministry of Health) to CU, a BBSRC project grant, Leverhulme Trust project grant and Leverhulme Trust Major Research Fellowship to PH, a BBSRC-ISIS grant to PH and SMA, and the Ministero Italiano Università e Ricerca, Italy, University of Rome “La Sapienza” and the IRCCS Fondazione Santa Lucia to SMA.
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