Mindfulness-Based Stress Reduction (MBSR) interventions have been shown to increase connectivity between the amygdala and the ventromedial prefrontal cortex (VMPFC). This could, in turn, increase abilities to regulate emotions.

Neurological Effects Resulting From Mindfulness-Based Stress Reduction: Increased connection between the amygdala and the ventromedial prefrontal cortex (VMPFC)

The amygdala is a section of the brain that processes fearful stimuli. Patients with anxiety disorders exhibit stronger amygdala responses than patients without anxiety disorders. Studies suggest that mindfulness interventions can reduce the amygdala response in patients with anxiety disorders.

Mindfulness Effects on the Amygdala and Anxiety

Since more than half of children with Autism Spectrum Disorder (ASD) display sensory over-responsivity, are there differences in brain response, habituation, and connectivity during exposure to sensory stimuli between children with ASD and sensory over-responsivity, compared to neurotypical children?

Neurobiology of sensory symptoms in ASD (research question)

Due to its role in processing emotional information, the amygdala is heavily involved in memory consolidation, which is the process of transferring newly learned information into long-term memory. It facilitates the encoding of memories at a much deeper level when the event is emotionally arousing.

Amygdala's Role in Memory Consolidation

Josselyn's 2010 experiment with rats illustrates the amygdala's role in memory storage. Using Pavlovian conditioning, rats were taught to associate a neutral tone with a foot shock, which produced a fear memory causing them to freeze defensively upon hearing the tone. However, when researchers induced cell death in the neurons of the lateral amygdala, the conditioned fear memory faded and became extinct, demonstrating that this region is essential for retaining fear-based memories.

Example of Amygdala's Role in Fear Memory: Josselyn's Rat Experiment

The amygdala is composed of various subnuclei, two of which are the basolateral complex and the central nucleus.

Subnuclei of the Amygdala

A study by Raineki et al. (2012) investigated the impact of negative early life experiences on rat pups. Pups were subjected to abusive conditions between postnatal days 8 and 12, which included either the mother having insufficient bedding material to build a proper nest or the pups undergoing fear conditioning (pairing an odor with a shock) without their mother present. Compared to a control group raised in normal conditions, the abused pups displayed more depressive-like behaviors during adolescence. These behavioral changes were correlated with heightened activation in the amygdala, suggesting that early life trauma can alter amygdala function and lead to behaviors that model human mood disorders.

Early Life Abuse in Rats Alters Amygdala Function and Induces Depressive-Like Behaviors

Human studies indicate a significant link between the amygdala and psychological conditions such as mood and anxiety disorders. Evidence shows that adolescents who are either diagnosed with or at high risk for these disorders often exhibit alterations in both the structure and function of their amygdala.

Amygdala's Role in Human Mood and Anxiety Disorders

Given the following scenario, identify the brain structure most responsible for the difference in memory recall between the two individuals and explain the mechanism behind this difference.

Emotional Memory Formation

Given the following scenario, identify the brain structure most responsible for the described emotional and memory-related responses and explain your reasoning.

Emotional Memory and Brain Function

Henry Molaison (H.M.) is one of psychology's most famous case studies. In 1953, surgeons removed large sections of his hippocampus to treat severe epilepsy. While the surgery successfully stopped his seizures without affecting his IQ or personality, it left him with anterograde amnesia. His short-term memory remained intact, but he permanently lost the ability to transfer new information into long-term memory—a process known as consolidation. This case was crucial for memory research because it demonstrated a clear dissociation between short-term and long-term memory and highlighted the temporal lobes' essential role in memory consolidation.

Case of Henry Molaison (H.M.)

The lateral amygdala is the specific area of the brain that is responsible for fear memories.

Lateral Amygdala

The amygdala is a key brain structure that plays a central role in processing and relaying emotional information, making it a major focus of research into the biological basis of emotions like fear and anxiety. It is composed of various subnuclei and has a crucial role in memory, influencing how memories are stored—a process affected by stress hormones—and is involved in memory consolidation, the transfer of new learning into long-term memory. This is facilitated by enabling a deeper level of memory encoding for emotionally arousing events.

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Mindfulness Based Stress Reduction (MBSR) interventions have multiple physiological effects including the following:
- Morphometric changes in brain regions
- Increased connection between the amygdala and the ventromedial prefrontal cortex (VMPFC) 

Neurological Effects Resulting From Mindfulness-Based Stress Reduction

- Anterior Cingulate Cortex
- Insular Cortex
- Prefrontal Cortex
- Amygdala

Areas of the Brain Responsible for Mindfulness

Three Main Structures in the Limbic System

Contrary to the earlier belief that memory involves the entire brain, research following Lashley's work has demonstrated that memory functions are localized. Specific brain regions and even individual neurons play key roles in forming memories. The primary structures identified as crucial for memory are the amygdala, the hippocampus, the cerebellum, and the prefrontal cortex.

Key Brain Structures Involved in Memory

Goldstein, E. B. (2014). Cognitive psychology: Connecting mind, research and everyday experience. Nelson Education.


Cognitive psychology: Connecting mind, research and everyday experience

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Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

The ventromedial prefrontal cortex (VMPFC) is a part of the brain involved in automatic emotion regulation.

Ventromedial Prefrontal Cortex (VMPFC) 

Amygdala

The ACC is involved in emotion-related learning, autonomic regulation, and emotion assessment. In other words, it helps in establishing: empathy, emotion, decision making, and impulse. 

Anterior Cingulate Cortex (ACC)

The IC relates emotion to physiological experiences. In other words, it helps the conscious brain ascribe specific bodily states to certain emotions. Such as a hug to pleasure and/or comfort. 

Insular Cortex (IC)

A part of the frontal lobe that is responsible for higher-level cognitive functioning and focuses on "in the moment" or rash behavior (decision-making, problem solving, and so on). This area is also responsible for the development of personality. The PFC has a handful of (not universally agreed upon) subdivisions:

- Dorsomedial
- Dorsolateral
- Ventromedial
- Ventrolateral
- Orbitofrontal

Prefrontal Cortex (PFC)

The hypothalamus is a brain structure that regulates various homeostatic processes, including blood pressure, appetite, and body temperature. It serves as an interface between the nervous system and the endocrine system, and it controls the hormonal secretions of the pituitary gland. Furthermore, it is involved in regulating sexual behavior and motivation.

Hypothalamus

The hippocampus, a structure within the temporal lobes, is central to learning and memory. It is essential for consolidating new information into long-term memory, a process that involves transferring new learning for permanent storage. Research has shown its specific involvement in normal recognition memory and spatial memory, as demonstrated in studies where rats with hippocampal lesions showed impairment in tasks like object recognition and maze running. Furthermore, the hippocampus projects information to cortical regions, which helps to give memories meaning and connect them with other memories. It is also critical for contextualized emotional learning. The famous case of patient H.M., who could not form new memories after his hippocampus was removed, provided significant evidence for its role.

Hippocampus

Match each of the following brain structures to its primary function.

The cerebellum, a hindbrain structure known as the 'little brain,' governs balance, coordination, and motor skills. It also plays a critical role in processing and storing implicit memories. This includes procedural memory for tasks, motor learning, and classical conditioning. Consequently, damage to the cerebellum can impair the ability to learn conditioned responses.

Cerebellum

The dentate gyrus is a structure within the hippocampus that aids in the processing of memory.

The Dentate Gyrus

The entorhinal cortex acts similarly to a gateway in the brain, allowing information to enter and exit the memory processing area of the brain, the hippocampus.

Entorhinal Cortex

Neurons are specialized cells located in the nervous system that send information between different parts of the body and the brain.

Neurons

Several key neurotransmitters, including epinephrine, dopamine, serotonin, glutamate, and acetylcholine, are understood to be involved in memory processes. While the precise function of each neurotransmitter is still a subject of ongoing research and debate, it is established that the communication between neurons facilitated by these chemicals is fundamental for the formation of new memories.

Role of Neurotransmitters in Memory

The cerebellum's primary function in memory is the processing of procedural memories, which are the memories for skills and routine actions.

Role of the Cerebellum in Memory

The hippocampus serves a critical function in memory as the primary site where new memories are encoded.

Role of the Hippocampus in Memory

The amygdala influences memory by helping to determine which pieces of information are stored as memories. This process is guided by the strength of the emotional response associated with an event.

Role of the Amygdala in Memory

A patient is involved in a car accident and sustains a localized brain injury. After the accident, they are unable to form new long-term memories of events or facts, such as what they ate for breakfast or the name of their new doctor. However, they can still recall memories from their childhood and can learn new physical skills, like a new dance routine, with practice. Their emotional responses to events seem normal. Based on this information, which brain structure is most likely to have been damaged, and why?

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