Beneath the Surface of the PTSD Iceberg: Evolutionary, Neurobiological and Physiological Perspectives on PTSD
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1 Beneath the Surface of the PTSD Iceberg: Evolutionary, Neurobiological and Physiological Perspectives on PTSD David Diamond Departments of Psychology, Molecular Pharmacology and Physiology, Center for Preclinical and Clinical Research on PTSD University of South Florida Tampa, Florida, USA
2 PTSD is the Result of Memory x Susceptibility/Resilience Interactions in a Healthy Brain Hyperfunctional Memory Processing
3 PTSD is the Result of Memory x Susceptibility/Resilience Interactions in a Healthy Brain Resilience Susceptible Hyperfunctional Memory Processing
4 PTSD is the Result of Memory x Susceptibility/Resilience Interactions in a Healthy Brain Resilience Susceptible Hyperfunctional Memory Processing Recovery Susceptible
5 PTSD is the Result of Memory x Susceptibility/Resilience Interactions in a Healthy Brain Resilience Susceptible Evolutionary- Biological Perspective on PTSD Hyperfunctional Memory Processing Recovery Susceptible
6 PTSD is the Result of Memory x Susceptibility/Resilience Interactions in a Healthy Brain Resilience Susceptible Hyperfunctional Memory Processing Evolutionary- Biological Perspective on PTSD Memory-Based Cognitive Treatment Recovery Susceptible
7 Memory Test: Have you ever seen this creature and what is its name?
8 This is a tardigrade
9 Mnemonic: Tardigrades are slow moving
10 A tardigrade is so slow it s late to class (tardy) causing it to receive a poor grade (tardy-grade) = tardigrade (mnemonic)
11 Strong Emotional Experiences Produce Flashbulb Memories
12
13 How Does a Flashbulb Memory Escalate to a Traumatic Memory? What Conditions Lead to Trauma Escalating to PTSD?
14 Overt PTSD Symptoms
15 Overt PTSD Symptoms Evolutionary Perspective on Stress, PTSD and Disease
16 Our physiological responses to stress enable us to respond to an immediate physical threat to our survival
17 Mobilization of Resources in Response to a Threat Energy: Increased Epinephrine, Blood Pressure, Heart Rate, Blood Glucose
18 Mobilization of Resources in Response to a Threat Prepare to be wounded: Immune Stimulation (inflammation), Energy: Increased Epinephrine, Blood Pressure, Heart Rate, Blood Glucose
19 Pathogenic Bacteria Thrive on Stress (Adrenaline) Enhanced Growth of E. Coli Compared to Lactobacillus in Response to Stress Ratio of E. Coli to Lactobacillus No Stress Stress
20 Mobilization of Resources in Response to a Threat Prepare to be wounded: Immune Stimulation (inflammation), Activate Coagulation Factors Energy: Increased Epinephrine, Blood Pressure, Heart Rate, Blood Glucose
21 Public Speaking: Stress-Induced Platelet Activation % Increase * = * * Epi PF4 β-tg Platelet Count Circulation, 71: ,1985
22 A Natural Experiment on Traumatic Stress: The Great Hanshin Earthquake Kobe, Japan January 17, ,434 died; 25,000 wounded; 300,000 homeless
23 Stress-induced activation of clotting factors Consequences? Clotting factors in people before versus 2 weeks after an earthquake in Japan
24 Number of new patients with myocardial infarction Consequences of an adaptive process gone awry There was a dramatic increase in the number of heart attacks in this population for weeks after the earthquake occurred
25 Mobilization of Resources in Response to a Threat Prepare to be wounded: Immune Stimulation (inflammation), Activate Coagulation Factors Powerful Activation of Memory Mechanisms Energy: Increased Epinephrine, Blood Pressure, Heart Rate, Blood Glucose
26 An Adaptive Cognitive Response to a Threat Gone Awry
27 With PTSD the Brain is Always Preparing the Body for an Attack Prepare to be wounded: Immune Stimulation (inflammation), Activate Coagulation Factors Powerful Activation of Memory Mechanisms Energy: Increased Epinephrine, Blood Pressure, Heart Rate, Blood Glucose
28 Adaptive Responses to an Acute Threat
29 Adaptive Responses: Platelet Activation, Increased Immune Response, Increased Energy (Epi/BP/HR/BG) Adaptive Responses to an Acute Threat
30 Adaptive Responses to an Acute Threat Adaptive Responses: Platelet Activation, Increased Immune Response, Increased Energy (Epi/BP/HR/BG) Maladaptive Responses: Autoimmune Disorders, Obesity, T2D, Cardiovascular Disease Death
31 Adaptive Responses to an Acute Threat Adaptive Responses: Platelet Activation, Increased Immune Response, Increased Energy (Epi/BP/HR/BG) Adaptive Responses: Hypervigilance/Activation of Brain Attention and Memory Systems Efficiently Process Information about a Threat Maladaptive Responses: Autoimmune Disorders, Obesity, T2D, Cardiovascular Disease Death
32 Adaptive Responses to an Acute Threat Adaptive Responses: Platelet Activation, Increased Immune Response, Increased Energy (Epi/BP/HR/BG) Adaptive Responses: Hypervigilance/Activation of Brain Attention and Memory Systems Efficiently Process Information about a Threat Maladaptive Responses: Autoimmune Disorders, Obesity, T2D, Cardiovascular Disease Death Maladaptive Responses: Neuronal Atrophy/ Impaired Memory/PTSD
33 Adaptive Responses to an Acute Threat Adaptive Responses: Platelet Activation, Increased Immune Response, Increased Energy (Epi/BP/HR/BG) Adaptive Responses: Hypervigilance/Activation of Brain Attention and Memory Systems Efficiently Process Information about a Threat Maladaptive Responses: Autoimmune Disorders, Obesity, T2D, Cardiovascular Disease Death Maladaptive Responses: Neuronal Atrophy/ Impaired Memory/PTSD
34 Overt PTSD Symptoms PTSD and Memory - Genetic Susceptibility and Neurobiology Evolutionary Perspective on Stress, PTSD and Disease
35
36
37 Lack of Social Support as a Primary Risk Factor for PTSD/Depression
38 Interactions: Gene x Trauma Environment x Social Support *
39 Amygdala Activation is an Essential Component of Emotional Memories
40 The Amygdala is Essential for the Development and Expression of PTSD
41 Greater Activation of the Amygdala in People With the Deletion Variant of the α-2b Adrenergic Gene Variant in Response to Evocative Pictures
42 The Deletion Variant of the α-2b Adrenergic Gene was Associated with Enhanced Memory for Evocative Pictures
43 The Deletion Variant of the α-2b Adrenergic Gene was Associated with Stronger and More Intrusive Traumatic Memories
44 Prefrontal Cortex Delayed Post-Natal Development
45
46 Less Developed PFC in Adults Maltreated as Children Early Maltreatment/Trauma as a Risk factor for PTSD
47 Impaired Functioning of the Prefrontal Cortex in PTSD
48 Imbalance Between PFC and Amygdala Activity in PTSD Reduced PFC Activation in PTSD Increased Amygdala Activation in PTSD
49
50 Hippocampus Function: To process and store memories of all of the facts, details and events of our lives.
51 Chronic Stress Suppresses Neurogenesis and Causes Atrophy of Hippocampal Neurons - Interfering With Memory Issue: Neuronal death and shrinkage of the Hippocampus with Stress/PTSD? Reduced Neurogenesis Stress No Stress Neuronal Atrophy (impaired information flow)
52 Size of Hippocampus Combat-Exposed Non-Combat-Exposed Twin Twin PTSD Severity
53 Evidence of Impaired Hippocampal Functioning in PTSD
54 Trait (global impairment) or State (acute anxiety) effects on Hippocampal Functioning?
55 Understanding Cognitive Deficits in PTSD by Studying the Debilitating Effects of Test Anxiety (the brain focuses on the threat, rather than the exam)
56
57 Overt PTSD Symptoms Neuroendocrine Abnormalities in PTSD PTSD and Memory - Genetic Susceptibility and Neurobiology Evolutionary Perspective on Stress, PTSD and Disease
58 Change in Neurochemistry in PTSD: Increased Sensitivity to Drugs that Activate Arousal (Norepinephrine) Systems Yohimbine α2 antagonist: increases NE
59 Magnitude (µv) Hypervigilance in PTSD PTSD Controls Stimulus Intensity (db)
60 Increased Sympathetic Activation/Arousal and Norepinephrine: Inability to Sleep and Increased Startle Hypervigilance Produces Misery but Enhances Survival
61 Hans Selye and Cortisol as the Stress Hormone
62
63 Insufficient Cortisol in PTSD to Rein in Sympathetic Activation of the Immune System
64 Overt PTSD Symptoms Neurobiology of Neutral, Emotional and Intrusive Memories Neuroendocrine Abnormalities in PTSD PTSD and Memory - Genetic Susceptibility and Neurobiology Evolutionary Perspective on Stress, PTSD and Disease
65 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Name?
66 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Tardigrade
67 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory
68 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Neocortex Hippocampus Flashbulb (emotional) Memory Amygdala
69 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Neocortex Hippocampus Amygdala Flashbulb (emotional) Memory Contextualization - Amygdala
70 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Neocortex Hippocampus Amygdala Flashbulb (emotional) Memory Contextualization - Amygdala Neocortex Hippocampus Amygdala Traumatic (fragmented) Memory
71 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Neocortex Hippocampus Neocortex Hippocampus Amygdala Amygdala Flashbulb (emotional) Memory Traumatic (fragmented) Memory Contextualization - Amygdala Fragmented and Intrusive Memories Amygdala
72 Learning Consolidation/Retrieval Neocortex Hippocampus Neutral (factual/episodic) Memory Neocortex Hippocampus Neocortex Hippocampus Amygdala Amygdala Flashbulb (emotional) Memory Traumatic (fragmented) Memory Contextualization - Amygdala PFC is Impaired by Strong Emotion Amygdala
73 Overt PTSD Symptoms Neurobiological Basis of a Non-Pharmacological Treatment Neurobiology of Neutral, Emotional and Intrusive Memories Neuroendocrine Abnormalities in PTSD PTSD and Memory - Genetic Susceptibility and Neurobiology Evolutionary Perspective on Stress, PTSD and Disease
74 Accelerated Resolution Therapy (ART) Non-Pharmacological Approach to PTSD Therapy A Form of EMDR (Eye Movement Desensitization and Reprocessing)
75 Reconsolidation: Experiences Occurring During Reactivation of a Memory Can Become Incorporated into the Memory Trauma Memory Retrieved During Therapy Trauma Memory Affect is Blunted Post-Therapy
76 Intrusive Memory: Repeated Reactivation of a Trauma Memory Trace Hippocampus Intrusive Memories Amygdala
77 Accelerated Resolution Therapy (ART) Reduced Sympathetic Activation + Imagery Rescripting + Eye Movements PFC - Hippocampus Amygdala
78 Accelerated Resolution Therapy (ART) Reduced Sympathetic Activation + Imagery Rescripting + Eye Movements PFC - Hippocampus Amygdala
79 Accelerated Resolution Therapy (ART) Reduced Sympathetic Activation + Imagery Rescripting + Eye Movements PFC - Hippocampus Amygdala
80 Accelerated Resolution Therapy (ART) Reduced Sympathetic Activation + Imagery Rescripting + Eye Movements PFC - Hippocampus Amygdala Modified Brain Memory Trace Which Generates Less Affect When Retrieved
81
82 Overt PTSD Symptoms
83 Overt PTSD Symptoms
84 Overt PTSD Symptoms Frontal Cortex Amygdala Hippocampus
85 Overt PTSD Symptoms Frontal Cortex Amygdala Hippocampus
86 Thank you - Questions?
87
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