Behavioral Neuroscience of Drug Addiction pp 247-275 | Cite as
Imaging Cognitive Deficits in Drug Abuse
Abstract
The neuropsychological network is a complex structure. To identify processes location and network capacity the brain imaging techniques together and in combination with other neuropsychological techniques and the expanding of well elaborated designs provide us with a multidimensional understanding, and contributes to the understanding of each illicit drug’s character, which is of importance in designing of new treatment programs and clinical practice. Cannabis, MDMA, amphetamine, cocaine, and heroin abusers display both acute effects and chronic effects, deficits in attention, memory, and executive functioning. These deficits may last beyond the period of intoxication and cumulate with years of use. Cannabis users may recruit an alternative neural network as a compensatory mechanism during performance of tasks of attention. There is some evidence indicating the detrimental effects of cannabis on the maturing adolescent brain. Stimulant dependence is characterized by a distributed alteration of functional activation. Attenuated anterior and posterior cingulate activation, reduced inferior frontal and dorsolateral prefrontal cortex activation, and altered posterior parietal activation point towards an inadequate demand-specific processing of information. On an individual level they exhibit process-related brain activation differences that are consistent with a shift from context-specific, effortful processing to more stereotyped, habitual response generation. Finally, opiate use appears to decrease the ability to shift cognitive set and inhibit inappropriate response tendencies.
Keywords
Cannabis Marijuana Heroin Amphetamine Methamphetamine MDMA Cocaine Methadone Cognitive deficits Chronic drugabuse Prefrontal cortex Residual effects Brain imaging Prenatal exposure Hippocampus AmygdaleAbbreviations
- 5-HT
Serotonin
- ACC
Anterior cingulate cortex
- ADHD
Attention-Deficit/Hyperactivity Disorder
- BOLD
Blood-oxygen-level-dependent
- BP
Binding potential
- CB1
Cannabinoid receptor
- CBF
Cerebral blood flow
- CBV
Cerebral blood volume
- DA
Dopamine
- DAT
DA transporter
- DLPFC
Dorsolateral prefrontal cortex
- ECF
Executive cognitive functioning
- ERP
Event-related potential
- fMRI
Functional MRI
- MDMA
3,4-Methylenedioxymethamphetamine, ecstasy
- METH
Methamphetamine
- MRI
Structural magnetic resonance imaging
- MRS
Magnetic resonance spectroscopy
- OFC
Orbitofrontal cortex
- PET
Positron emission tomography
- PFC
Prefrontal cortex
- PVC
Primary visual cortex
- rCBF
Regional cerebral blood flow
- SPET
Single photon emission tomography
- SPECT
Single photon emission computed tomography
- SUR
Specific uptake ratio
- THC
Delta-9-tetrahydroxycannabinol
- VBM
Voxel-based morphometry
- WCST
Wisconsin Card Sorting Test
Notes
Acknowledgment
I would like to acknowledge Rolf Öhman, MD and Professor Emeritus, Lund University, Lund, Sweden for his thorough remarks on the manuscript.
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