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Functional MRI studies in disruptive behaviour disorders

Published online by Cambridge University Press:  31 October 2011

M. Bellani ,
M. Garzitto  and
P. Brambilla
M. Bellani*
Affiliation:
Section of Psychiatry and Clinical Psychology, Department of Public Health and Community Medicine, Inter-University Center for Behavioural Neurosciences (ICBN), University of Verona, Verona, Italy
M. Garzitto
Affiliation:
Department of Human Sciences, University of Udine, Udine, Italy
P. Brambilla
Affiliation:
Department of Experimental Clinical Medicine, Inter-University Center for Behavioural Neurosciences (ICBN), University of Udine, Udine, Italy IRCCS ‘E. Medea’ Scientific Institute, Udine, Italy
*
*Address for correspondence: Dr M. Bellani, Section of Psychiatry and Clinical Psychology, Department of Public Health and Community Medicine, University of Verona, Piazzale L.A. Scuro 10, 37134 Verona, Italy. (Email: [email protected]; [email protected])
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Abstract

Aggressive or antisocial behaviours with violations of social rules are the main features of disruptive behaviour disorders (DBDs), which are developmental diseases and include conduct disorder and oppositional defiant disorder. In the last decade, several efforts have been made to shed light on the biological underpinnings of DBDs. In this context, the main findings of functional magnetic resonance imaging studies in DBD are reported here. There are indications of neural dysfunctions in response to affective stimuli, especially regarding medial and orbitofrontal prefrontal cortex and connected subcortical structures.

Keywords

Disruptive behaviour disordersadolescentsfMRI
Type
Neurobiology of Psychosis
Information
Epidemiology and Psychiatric Sciences , Volume 21 , Issue 1 , March 2012 , pp. 31 - 33
Copyright
Copyright © Cambridge University Press 2011

Disruptive behaviour disorders (DBDs) are common and severe developmental disorders include conduct disorder (CD) and oppositional defiant disorder (ODD). They are characterized by aggressive and antisocial behaviours associated with violations of social rules (e.g. thefts and violent behaviour) and are considered a predictor of antisocial/borderline personality disorder and substance abuse (Schutter et al. Reference Schutter, van Bokhoven, Vanderschuren, Lochman and Matthys2011). Also, they are more common in boys than in girls and are associated with a lower quality of life (Bot et al. Reference Bot, de Leeuw den Bouter and Adriaanse2011). High comorbidity is usually observed with attention deficit hyperactivity disorder (ADHD) (Spencer, Reference Spencer2006; Bellani et al. Reference Bellani, Moretti, Perlini and Brambilla2011). It should be noted that DBD children and preadolescents with comorbid ADHD show higher use of mental health services than those with mood or anxiety disorders and that ODD diagnosis is associated with the highest likelihood of the use of services at the age of 14–15 years (Ezpeleta et al. Reference Ezpeleta, Granero, de la Osa and Domènech2009). Recently, interest was addressed to a sub-group of DBDs with the so-called callous-unemotional traits (i.e. reduced empathy and guilt, poor emotional response), which may be associated with increased risk of antisocial outcomes (Marsh et al. Reference Marsh, Finger, Mitchell, Reid, Sims, Kosson, Towbin, Leibenluft, Pine and Blair2008; De Brito et al. Reference De Brito, Mechelli, Wilke, Laurens, Jones, Barker, Hodgins and Viding2009).

Several functional magnetic resonance imaging (fMRI) studies have been conducted so far to explore the biological bases of DBDs (Table 1). Specifically, adolescents with DBD exposed to emotional pictures (i.e. negative/painful situations and fearful/sad faces) showed enhanced activation of amygdala, striatum, mid-cingulate and orbitofrontal cortex (OFC) (Herpertz et al. Reference Herpertz, Huebner, Marx, Vloet, Fink, Stoecker, Shah, Konrad and Herpertz-Dahlmann2008; Decety et al. Reference Decety, Michalska, Akitsuki and Lahey2009; Passamonti et al. Reference Passamonti, Fairchild, Goodyer, Hurford, Hagan, Rowe and Calder2010) and reduced activation of anterior cingulate cortex (ACC) (Sterzer et al. Reference Sterzer, Stadler, Krebs, Kleinschmidt and Poustka2005). Also, they had reduced functional connectivity between amygdala and medial prefrontal cortex (Marsh et al. Reference Marsh, Finger, Mitchell, Reid, Sims, Kosson, Towbin, Leibenluft, Pine and Blair2008; Decety et al. Reference Decety, Michalska, Akitsuki and Lahey2009). In two studies, reduced activation of amygdala was instead observed in DBD adolescents with high callous-unemotional traits (Marsh et al. Reference Marsh, Finger, Mitchell, Reid, Sims, Kosson, Towbin, Leibenluft, Pine and Blair2008; Jones et al. Reference Jones, Laurens, Herba, Barker and Viding2009). Interestingly, a reduced activation of amygdala, insula and PFC was also present in response to angry faces in CD (Passamonti et al. Reference Passamonti, Fairchild, Goodyer, Hurford, Hagan, Rowe and Calder2010). Such functional abnormalities are consistent with structural alterations showing volume reduction of amygdala, hippocampus, insula, OFC, dorsomedial PFC, temporal cortex and caudate nucleus, particularly in CD children (Huebner et al. Reference Huebner, Vloet, Marx, Konrad, Fink, Herpertz and Herpertz-Dahlmann2008; Fairchild et al. Reference Fairchild, Passamonti, Hurford, Hagan, von dem Hagen, van Goozen, Goodyer and Calder2011). However, increased sizes of medial OFC and dorsal ACC, with preserved amygdala and insula morphometry, have also been found in boys with callous-unemotional traits and conduct problems (De Brito et al. Reference De Brito, Mechelli, Wilke, Laurens, Jones, Barker, Hodgins and Viding2009).

Table 1. fMRI studies in DBDs using affective stimuli

ACC, anterior cingulate cortex; ADHD, attention deficit hyperactivity disorder; AO, adolescent-onset; CD, conduct disorder; CUT, high callous-unemotional traits; EO, early-onset; HS, healthy subjects; MCC, midcinguale cortex; ODD, oppositional defiant disorder; OFC, orbitofrontal cortex; PFC, prefrontal cortex.

Based on the imaging literature briefly summarized above, a dysfunctional network including amygdala, PFC, striatum and insula may underlie affective dysregulation reported in subjects with DBD. In this context, preliminary findings suggest that DBD patients with callous-unemotional traits, particularly those with CD, may represent a specific sub-group with peculiar functional and structural brain maturation. Future fMRI studies should explore whether such abnormalities are specific to CD or ODD (Barker et al. Reference Barker, Tremblay, van Lier, Vitaro, Nagin, Assaad and Séguin2011) and whether they persist over time during development. They should also further investigate the role of callous-unemotional traits for brain development in these children and should differentiate the specific features of DBD and ADHD (Rubia, Reference Rubia2011).

Footnotes

This Section of Epidemiology and Psyhiartric Science regularly appears in each issue of the Journal to describe relevant studies investigating the relationship between neurobiology and psychosocial psychiatry in major psychoses.The aim of these Editorials is to provide a better understanding of the neural basis of psychopathology and clinical features of these disorders, in order to raise new perspectives in every-day clinical practice.

Paolo Brambilla, Section Editor and Michele Tansella, Editors EPS

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Table 1. fMRI studies in DBDs using affective stimuli