Lotte Berk1, Jennifer L Stewart2, April C May1, Reinout W Wiers3, Paul W Davenport4, Martin P Paulus1,5,6, Susan F Tapert1,6. 1. University of California San Diego, Department of Psychiatry, La Jolla, CA, USA. 2. City University of New York Queens College, Department of Psychology, New York, NY, USA. 3. University of Amsterdam, Developmental Psychology, Amsterdam, the Netherlands. 4. University of Florida, Department of Physiology, Gainesville, FL, USA. 5. Laureate Institute for Brain Research, Tulsa, OK, USA. 6. Veterans Affairs San Diego Healthcare System, San Diego, CA, USA.
Abstract
AIMS: Adolescents with substance use disorders (SUD) exhibit hyposensitivity to pleasant internally generated (interoceptive) stimuli and hypersensitivity to external rewarding stimuli. It is unclear whether similar patterns exist for aversive interoceptive stimuli. We compared activation in the insular cortex and other brain regions during the anticipation and experience of aversive stimuli between adolescents with SUD and those without. DESIGN: Cross-sectional experimental study with two groups. PARTICIPANTS: Adolescents (ages 15-17 years) with an alcohol or marijuana SUD (n=18) and healthy comparison subjects (CON, n=15). Participants were recruited by distributing flyers at local high schools. SETTING: Keck Imaging Center, University of California San Diego, CA, USA. MEASUREMENTS: Behavioral and neural responses to a continuous performance task with inspiratory breathing load recorded during an fMRI session. Questionnaires assessed life-time drug use, anxiety, sensation-seeking, impulsivity, affect and bodily awareness. Visual analog scales assessed drug craving and breathing load responses. FINDINGS: Across subjects, experience of breathing load elicited greater bilateral anterior and posterior insula (AI and PI, respectively) activation than anticipation (F(1,31)=4.16, P<0.05). SUD exhibited greater left AI and bilateral PI activation during breathing load than anticipation, compared with CON (F(1,31)=4.16, P<0.05). In contrast, CON showed greater activation during anticipation than breathing load in left PI, compared with SUD (F(1,31)=4.16, P<0.05). CONCLUSIONS: Adolescents with alcohol and marijuana substance use disorders may be hypersensitive to aversive interoceptive stimuli.
AIMS: Adolescents with substance use disorders (SUD) exhibit hyposensitivity to pleasant internally generated (interoceptive) stimuli and hypersensitivity to external rewarding stimuli. It is unclear whether similar patterns exist for aversive interoceptive stimuli. We compared activation in the insular cortex and other brain regions during the anticipation and experience of aversive stimuli between adolescents with SUD and those without. DESIGN: Cross-sectional experimental study with two groups. PARTICIPANTS: Adolescents (ages 15-17 years) with an alcohol or marijuana SUD (n=18) and healthy comparison subjects (CON, n=15). Participants were recruited by distributing flyers at local high schools. SETTING: Keck Imaging Center, University of California San Diego, CA, USA. MEASUREMENTS: Behavioral and neural responses to a continuous performance task with inspiratory breathing load recorded during an fMRI session. Questionnaires assessed life-time drug use, anxiety, sensation-seeking, impulsivity, affect and bodily awareness. Visual analog scales assessed drug craving and breathing load responses. FINDINGS: Across subjects, experience of breathing load elicited greater bilateral anterior and posterior insula (AI and PI, respectively) activation than anticipation (F(1,31)=4.16, P<0.05). SUD exhibited greater left AI and bilateral PI activation during breathing load than anticipation, compared with CON (F(1,31)=4.16, P<0.05). In contrast, CON showed greater activation during anticipation than breathing load in left PI, compared with SUD (F(1,31)=4.16, P<0.05). CONCLUSIONS: Adolescents with alcohol and marijuana substance use disorders may be hypersensitive to aversive interoceptive stimuli.
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