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S Disease and Intracranial Cortical Recordings cortex xxx (2012) 1e17 Available online at www.sciencedirect.com Journal homepage: www.elsevier.com/locate/cortex Research report Motor-language coupling: Direct evidence from early Parkinson’s disease and intracranial cortical recordings Agustı´n Iba´n˜eza,b,d,*,1, Juan F. Cardona a,b,c,1,2, Yamil Vidal Dos Santos a,l, Alejandro Blenkmann b,e,f,g,m,Pı´a Aravena h, Marı´a Roca a, Esteban Hurtado i, Mirna Nerguizian a,g, Lucı´a Amoruso a,b, Gonzalo Go´mez-Are´valo a, Anabel Chade a, Alberto Dubrovsky a, Oscar Gershanik a,b, Silvia Kochen e,f, Arthur Glenberg j,k, Facundo Manes a and Trista´n Bekinschtein a,n a Laboratory of Experimental Psychology and Neuroscience (LPEN), Institute of Cognitive Neurology (INECO); Favaloro University, Buenos Aires, Argentina b National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina c Faculty of Psychology, Universidad de Buenos Aires (UBA), Argentina d Laboratory of Cognitive and Social Neuroscience, Universidad Diego Portales, Santiago, Chile e Epilepsy Laboratory, IBCN, “Prof. E. De Robertis”, School of Medicine, University of Buenos Aires, Argentina f Epilepsy Section, Division Neurology, Ramos Mejı´a Hospital, Buenos Aires, Argentina g School of Engineering, Exact and Natural Sciences, Favaloro University, Buenos Aires, Argentina h L2C2-Institut des Sciences Cognitives, Bron Cedex, France i School of Psychology, Pontificia Universidad Cato´lica de Chile, Santiago, Chile j Department of Psychology, Arizona State University, Tempe, AZ, USA k Department of Psychology, University of WisconsineMadison, Madison, WI, USA l Laboratory of Integrative Neuroscience, Faculty of Physics, Universidad de Buenos Aires, Argentina m LEICI, School of Engineering, National University of La Plata, La Plata, Argentina n Cognition and Brain Sciences Unit, Medical Research Council, Cambridge, United Kingdom article info abstract Article history: Language and action systems are functionally coupled in the brain as demonstrated by Received 8 January 2012 converging evidence using Functional magnetic resonance imaging (fMRI), electroen- Reviewed 23 February 2012 cephalography (EEG), transcranial magnetic stimulation (TMS), and lesion studies. In Revised 28 February 2012 particular, this coupling has been demonstrated using the action-sentence compatibility Accepted 28 February 2012 effect (ACE) in which motor activity and language interact. The ACE task requires partici- Action editor Stefano Cappa pants to listen to sentences that described actions typically performed with an open hand Published online xxx (e.g., clapping), a closed hand (e.g., hammering), or without any hand action (neutral); and to press a large button with either an open hand position or closed hand position imme- Keywords: diately upon comprehending each sentence. The ACE is defined as a longer reaction time ACE (RT) in the action-sentence incompatible conditions than in the compatible conditions. Parkinson’s disease Here we investigated direct motor-language coupling in two novel and uniquely * Corresponding author. Laboratory of Experimental Psychology & Neuroscience (LPEN), Institute of Cognitive Neurology (INECO) & CONICET, Pacheco de Melo 1860, Buenos Aires, Argentina. E-mail address: [email protected] (A. Iba´n˜ ez). 1 Equal contribution to the manuscript (AI & JC). 2 This work is part of the PhD dissertation (Cardona JF) ongoing by the author at UBA Argentina. 0010-9452/$ e see front matter ª 2012 Elsevier Srl. All rights reserved. doi:10.1016/j.cortex.2012.02.014 Please cite this article in press as: Iba´n˜ ez A, et al., Motor-language coupling: Direct evidence from early Parkinson’s disease and intracranial cortical recordings, Cortex (2012), doi:10.1016/j.cortex.2012.02.014 2 cortex xxx (2012) 1e17 ECoG informative ways. First, we measured the behavioural ACE in patients with motor Intracranial N400 impairment (early Parkinson’s disease e EPD), and second, in epileptic patients with direct Intracranial MP electrocorticography (ECoG) recordings. In experiment 1, EPD participants with preserved general cognitive repertoire, showed a much diminished ACE relative to non-EPD volun- teers. Moreover, a correlation between ACE performance and action-verb processing (kissing and dancing test e KDT) was observed. Direct cortical recordings (ECoG) in motor and language areas (experiment 2) demonstrated simultaneous bidirectional effects: motor preparation affected language processing (N400 at left inferior frontal gyrus and middle/ superior temporal gyrus), and language processing affected activity in movement-related areas (motor potential at premotor and M1). Our findings show that the ACE paradigm requires ongoing integration of preserved motor and language coupling (abolished in EPD) and engages motor-temporal cortices in a bidirectional way. In addition, both experiments suggest the presence of a motor-language network which is not restricted to somatotopi- cally defined brain areas. These results open new pathways in the fields of motor diseases, theoretical approaches to language understanding, and models of action-perception coupling. ª 2012 Elsevier Srl. All rights reserved. 1. Introduction Jeannerod, 2001; Richardson et al., 2003; Zwaan et al., 2002) cortical motor lesions or impairments should affect language Understanding the mutual coordination of motor and comprehension. In support of this prediction, neuroimaging language systems is critical for different research programs. findings (e.g., Aziz-Zadeh et al., 2006; Hauk et al., 2004; These systems are functionally coupled in the brain as Tettamanti et al., 2005) have suggested that lexical stimuli demonstrated by converging evidence using Functional (either single words or sentences) referring to different body magnetic resonance imaging (fMRI), electroencephalography parts (e.g., hand and mouth) somatotopically activate cortical (EEG), transcranial magnetic stimulation (TMS), and lesion regions. However, other studies have failed to find a strict studies (Pulvermu¨ ller 2001; 2005; Pulvermu¨ ller and Fadiga, somatotopic organization of action words. For instance, 2010). In addition, this coupling has been demonstrated Postle et al. (2008) found no evidence of somatotopic orga- behaviourally using the action-sentence compatibility effect nization for effector-related words using cytoarchitecturally (ACE) in which motor activity and language interact and functionally defined maps of the primary and premotor (Aravena et al., 2010; Glenberg, 2006; Glenberg et al., 2008a; cortex. Using Voxel-based Lesion-Symptom Mapping anal- Glenberg et al., 2008b; Glenberg and Kaschak, 2002; yses in stroke patients, Are´valo et al. (2012) also found no Kaschak and Borreggine, 2008; Masumoto et al., 2004). The evidence of a somatotopically-organized distribution of ACE task required participants to listen to sentences and effector specific regions. These results put forward a partial press a large button immediately upon comprehending each overlap of actions and processing of action-related sentences. sentence. In one block, the button is pressed using an open Are´valo et al. (2011) suggested that interaction between hand (OH) response, and in one block, the button is pressed motor networks and the language network in humans may using a closed hand (CH) response. Importantly, participants not be confined to a particular region in the premotor/motor keep their hands in the required pre-assigned shape cortex. Motor and language process would not be completely throughout the block of trials. The OH sentences describe dependent of a cortical somatotopic organization. In experi- actions typically performed with an open hand (e.g., clap- ment 1, we tested the relationship between action language ping), the CH sentences describe actions performed with and current motor activity in individuals with a subcortical a closed hand (e.g., hammering), and the neutral sentences motor impairment (EPD) and normal volunteers. In the EPD, (N) did not describe hand actions. The combination of only subcortical (non-somatotopic) motor regions are affected response type and sentence type generates compatible (OH (early stages of the disease). Therefore, EPD, due to its non- sentence and OH response or CH sentence and CH response), specific non-somatotopic motor impairment, is ideal for incompatible (OH sentence and CH response or vice versa), testing the coupling between motor and language systems. and neutral (N sentence with either response) trials. The A growing body of research indicates that specific verb ACE is defined as a longer reaction time (RT) in the incom- processing is impaired in Parkinson’s disease, including verb patible conditions than in the compatible conditions. First, production (Bertella et al., 2002; Boulenger et al., 2008; we measured the ACE in patients with motor impairment Crescentini et al., 2008; Peran et al., 2003); action-verb genera- (early Parkinson’s disease e EPD), and second in epileptic tion and conjugation (Longworth et al., 2005; Peran et al., 2009); patients with direct electrocorticography (ECoG) recordings. sentence comprehension (Grossman et al., 1992; Grossman According to theories of a simultaneous action-perception 1999; Lieberman et al., 1992; Ullman et al., 1997); action-verb cycle (Pulvermu¨ ller, 2001; 2005; Pulvermu¨ ller and Fadiga, identification (Boulenger et al., 2008); and specific verb pro- 2010) and theories of language comprehension as simula- cessing during sentence comprehension (Whiting et al., 2005). tion (Barsalou, 1999; Bergen et al.,
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