Learning and memory

H.M.

A patient who had part of his medial temporal lobe removed to treat epilepsy, resulting in an inability to form long-term memories.

Medial Temporal Lobe

Region of the brain involved in forming long-term memories; its removal can lead to severe amnesia.

Hippocampus

A brain structure in the limbic system that converts short-term memories to long-term memories and is essential for spatial navigation.

Amygdala

Brain structure associated with attaching emotional significance to memories.

Parahippocampal region

Area of the brain that processes the 'what' aspect of events.

Declarative Memory

Conscious memory of facts and events that can be verbally expressed.

Semantic Memory

Type of declarative memory that involves knowledge of facts and data.

Episodic Memory

Type of declarative memory that involves recalling personal experiences and specific events.

Prefrontal Cortex

Brain region involved in combining information in working memory with other relevant information.

Executive Functions

Cognitive processes such as selection and rehearsal that help in organizing memories.

Nondeclarative Memory

Unconscious memory related to skills and how to perform tasks.

Procedural Memory

A type of nondeclarative memory involved in knowing how to do skills.

Emotional Memory

Memory that is influenced by emotions, aiding in survival through fight-or-flight responses.

Long-Term Potentiation (LTP)

A lasting increase in the strength of synapses based on recent patterns of activity.

Synaptic Plasticity

The ability of synapses to change their strength, crucial for learning and memory.

NMDA Receptor

A type of receptor that requires depolarization to remove a magnesium block and facilitate calcium influx.

Calcium and Memory

Calcium influx through NMDA receptors activates pathways that promote synaptic growth and memory.

Neurotrophins

Protein factors produced in response to synaptic activity that promote the growth and differentiation of neurons.

CREB

A protein that is activated by cAMP and plays a crucial role in regulating gene expression involved in memory.

Synapse

The junction between two neurons where neurotransmission occurs.

Signal Transmission

The process of communication between neurons through neurotransmitters across synapses.

Synchronous Signals

Simultaneous signals required for NMDA receptor activation and consequent memory processing.

Hypothalamus

Brain region involved in emotional memory, particularly in regulating fight-or-flight responses.

Sympathetic Nervous System

Component of the autonomic nervous system that regulates the body's rapid involuntary response to dangerous or stressful situations.

Prosopagnosia

A cognitive disorder characterized by the inability to recognize faces.

Working Memory

Temporary storage and manipulation of information necessary for cognitive tasks.

Storage of Memory

Involves changes in synaptic connections as memories are formed and recalled.

Event-specific Details

The what, when, and where aspects of episodic memory processed by the parahippocampal region.

Fight-or-Flight Response

Physiological reaction that occurs in response to a perceived harmful event or threat.

Memory Consolidation

The process by which memories become stable in the brain over time.

Cation Channel

A type of ion channel that allows the passage of positively charged ions, such as sodium and calcium.

Mg2+ Blockage

The resting state of NMDA receptors where magnesium ions block the channel, preventing ion flow.

Molecular Coincidence Detector

Function of NMDA receptors that requires simultaneous depolarization and presynaptic activity for activation.

Increased AMPARs

The result of NMDA receptor activation that enhances synaptic responsiveness to neurotransmitters.

Memory Formation

A complex process involving multiple brain regions and molecular mechanisms to encode and store information.