Methods of Visualizing the Living Human Brain
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1 Methods of Visualizing the Living Human Brain! Contrast X-rays! Computerized Tomography (CT)! Magnetic Resonance Imaging (MRI)! Positron Emission Tomography (PET)! Functional MRI! Magnetoencephalography (MEG) Contrast X-rays! Substance that absorbs X-rays is introduced into the structure of interest to make it stand out! Cerebral angiography: dye injected into carotid artery reveals displacement or enlargement of blood vessels 1
2 Computerized Tomography (CT)! Uses a computer to combine many individual X-rays to produce a three dimensional picture of the brain! Not particularly highresolution 2
3 Magnetic Resonance Imaging (MRI)! MRI passes strong magnetic field through head, causing certain molecules (hydrogen) to spin with a particular orientation.! Advantages:! Does not expose the brain to X-ray like CT scan! Better anatomical resolution than CT! Disadvantages?? $$$ Positron Emission Tomography (PET)! Provides images of brain activity, rather than structure! Inject radioactive 2- deoxyglucose (2-DG) into patient s carotid artery! 2-DG is taken up into active neurons.! PET measures the level of radioactivity of cells in brain regions 3
4 Functional MRI! fmri detects the regional changes in blood oxygenation due to activity-related changes in blood flow:! More active neurons! --> more blood flow! --> more O2! Advantages over PET:! Nothing injected! Provides structural and functional info! Better resolution 4
5 Magnetoencephalography (MEG)! Measures brain activity in terms of changes in magnetic fields measured on the surface of the scalp 5
6 Methods of Visualizing the Living Human Brain Neurobiology of Meditation The Measurement of Regional Cerebral Blood Flow During the Complex Cognitive Task of Meditation: a Preliminary SPECT Study. A. Newberg and colleagues Psychiatry Research, 2001 (106)
7 Neurobiology of Meditation Hypothesis: Given that meditation has been shown to " lower heart rate " decrease oxygen consumption by 17% " increase theta brain waves (theta=wave pattern right before sleep (but not during sleep), also associated with imagery, creativity) then there should be alterations in brain function associated with the meditative state. Neurobiology of Meditation Methods: Measure blood flow using SPECT (single photon emission computed tomography) before and during meditative state. n=8 highly experienced Tibetan Buddhist mediators Within-subject control: subject serves as own control 7
8 Neurobiology of Meditation What is SPECT? Subject injected with a radiolabeled tracer. The pattern with which this tracer accumulates in the brain is measured. Advantages? Can use commercially available tracers; tracers more stable (compared to PET) Disadvantages? Low anatomical resolution (compared to PET, fmri); injection of tracer Results: INCREASED prefrontal activation seen with meditation. Prefrontal cortex important for focusing attention and concentration. Prefrontal Cortex Prefrontal Cortex From A. Newberg, 2001 Baseline Meditation 8
9 Results: DECREASED parietal activation seen with meditation. Parietal lobe important for our sense of orientation in space and time. Baseline Meditation From A. Newberg, 2001 Superior Parietal Lobe Superior Parietal Lobe Neurobiology of Acupuncture Acupuncture: a traditional Chinese healing art used as adjunct therapy for "Chemotherapy-associated nausea "Post-surgical dental pain "Drug addiction "Stroke rehabilitation Mechanisms underlying acupuncture s effects are being investigated. 9
10 Neurobiology of Acupuncture Goal of a study by R. Gollub and colleagues at Massachussetts General Hospital and Harvard: Use fmri to identify what brain structures are activated by acupuncture needling in healthy subjects. Methods Scan brain (with fmri) before, during and after acupuncture needling AND compare this with tactile stimulation (no needle) over same region. Neurobiology of Acupuncture Results Region Affected Level of Activation ACUP somatosensory cortex increased thalamus decreased hippocampus decreased amygdala decreased nucleus accumbens decreased CONTROL somatosensory cortex increased 10
11 Neurobiology of Acupuncture Where is somatosensory cortex? Where is nucleus accumbens? Neurobiology of Acupuncture Can the level of activation in certain regions help explain acupuncture s therapeutic effects? ACUP Region Affected and Why somatosensory cortex increased somatosensation of the needle being inserted thalamus and hippocampus decreased perception of pain amygdala and nucleus accumbens decreased craving sensation associated with cocaine use CONTRL* somatosensory cortex increased somatosensation of tactile stimulation (touch) 11
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