Alexei Volkov
Experience-dependent plasticity, also known as neuroplasticity, is the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections. The brain remodels itself based on sensory, behavioural, and cognitive experiences, and this process is critical for recovery after brain damage. The term plasticity was first used in 1890 by William James, who described it as a structure weak enough to yield to an influence, but strong enough not to yield all at once. The nervous system's plasticity is most evident during development, but experience can shape information processing throughout an animal's lifetime. For example, repeated exposure to similar stimuli can improve our ability to discriminate between them. While the brain was once thought to be nonrenewable, it is now understood that it can reorganize its neural circuitry based on experience, learning, and sensory input.
| Characteristics | Values |
|---|---|
| Definition | "Neuroplasticity or brain plasticity is defined as the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections." |
| Key Factors | Learning, experience, and sensory input |
| Examples | Circuit and network changes that result from learning a new ability, information acquisition, environmental influences, pregnancy, caloric intake, practice/training, and psychological stress |
| Brain Recovery | Neuroplasticity aids brain recovery after damage caused by events like stroke or traumatic injury |
| Rehabilitation | Constraint-induced therapy (CIT) and other rehabilitative training can play a crucial role in encouraging brain reorganisation |
| Brain Development | The brain exhibits a higher degree of plasticity during development than in adulthood |
| Neural Changes | Neural changes are most evident during development, but adult cortical circuits can be modified by perceptual learning and visual deprivation |
| Brain Plasticity Studies | Research has been conducted on monkeys, rats, and barn owls |
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What You'll Learn
Neuronal connections and brain formation
The brain exhibits a higher degree of plasticity than the adult brain, with the ability to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections. Neuronal connections and brain formation are driven by complex genetic instructions. Neurons that fire together create stronger structures and more prominent parts of the brain, while those that do not sync well die out. This is why we have the most neurons when we are young and gradually start losing grey matter as we age.
The nervous system's ability to modify the strength and efficacy of synaptic transmission through a diverse number of activity-dependent mechanisms is referred to as synaptic plasticity. The plasticity hypothesis is based on nerve impulse activity and subsequent changes in nerve fibres at the cortical level. Nerve impulses lead to functional transformations in the cortical network by carrying out excitability of nerve fibres, which then enhances plastic changes in the nervous system, leading to neuroplasticity.
Research has shown that many aspects of the brain can be altered even in adulthood, with adult cortical circuits modifiable by a variety of manipulations, such as perceptual learning and visual deprivation. The brain constantly remodels itself based on sensory, behavioural, and cognitive experiences, and this experience-dependent plasticity is a critical process for recovery after brain damage. For example, in the case of a weak arm, constraining the unaffected arm and forcing the use of the affected arm improves its functional use.
The brain's ability to reorganise its neural circuitry based on experience, learning, and sensory input can be harnessed to promote recovery. Understanding the principles of neural plasticity offers hope for optimising rehabilitation after brain damage, with learning serving as a tool for brain recovery alongside other therapies.
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Brain recovery after damage
The brain is the body's control room, and when it gets injured, the consequences can be extensive. Brain injuries can happen at birth or as a result of an illness or trauma. They can affect everything from movement to memory and emotions. While neurons in the brain cannot regenerate, the brain cells that survive can adapt to make up for the loss. This is where neuroplasticity comes in.
Neuroplasticity, or brain plasticity, is the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections. It is a highly experience-dependent phenomenon, especially experiences that occur in the early stages of life. These experiences are expected to have long-lasting effects. Learning is the key to neural adaptation, and plasticity is the mechanism for encoding and changing behaviours.
Brain plasticity is also a phenomenon that aids brain recovery after damage caused by events like strokes or traumatic injuries. The ability to manipulate specific neuronal pathways and synapses has important implications for physiotherapeutic clinical interventions that will improve health. Promising therapies like specific exercise training, cognitive training, and neuropharmacology are all based on our current understanding of brain plasticity.
Rehabilitation plays a crucial role in promoting brain recovery after damage. It can include physical, occupational, and speech therapy, as well as mental healthcare and social support. The duration of rehabilitation and the amount of follow-up care needed depend on the severity of the brain damage and the individual's response to therapy. Some people may recover completely, while others may require lifetime care or experience long-term effects such as an increased risk for Parkinson's disease, Alzheimer's disease, or other forms of dementia.
Overall, while brain injuries can have significant impacts, the brain's ability to adapt and reorganise itself through neuroplasticity offers hope for recovery. Rehabilitation and therapeutic interventions play a vital role in this process, helping individuals regain function and improve their quality of life.
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Cortical remapping
Neuroplasticity, also known as neural plasticity or brain plasticity, is the process by which the brain is able to adapt structurally and functionally in response to intrinsic or extrinsic stimuli. This process involves the nervous system reorganizing its structure, functions, or connections. One example of neuroplasticity is cortical remapping, which involves the remapping of somatosensory regions and the recovery of altered skills.
Overall, cortical remapping is a form of neuroplasticity that involves the reorganization of cortical representations of body parts. This process can occur due to injury, development, or other factors, and it plays a role in the recovery of altered skills and sensations.
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Neural oscillation
Neuroplasticity encompasses various aspects, including individual neuron pathways forming new connections and systematic adjustments. Neural oscillation falls within these systematic adjustments, alongside cortical remapping, homologous area adaptation, cross-modal reassignment, map expansion, and compensatory masquerade. These systematic adjustments reflect the brain's remarkable capacity for adaptation and reorganisation.
The concept of neural oscillation specifically relates to the rhythmic or periodic fluctuations in neural activity. These oscillations occur at different frequencies and are believed to play a crucial role in cognitive functions and information processing. They enable the synchronisation and coordination of neural activity across different brain regions, facilitating communication between neurons.
Experience-dependent plasticity has been observed to cause transient increases in grey matter volume, specifically in the astrocytes, which are glial cells that support and protect neurons. This increase in grey matter volume corresponds to the swelling of astrocytes and the remodelling of synapses. These structural changes contribute to the brain's ability to adapt and optimise its functioning based on new experiences and learning.
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Synaptic plasticity
Neuroplasticity is the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections. Synaptic plasticity is a type of neuroplasticity that refers to the ability of synapses to strengthen or weaken over time in response to increases or decreases in their activity. Synapses are the junctions between neurons that allow them to communicate. Synaptic plasticity controls how effectively two neurons communicate with each other. The strength of communication between two synapses can be likened to the volume of a conversation, with some neurons whispering to each other and others shouting. This "volume setting" of the synapse, or the synaptic strength, is not static but can change in both the short term and long term. Short-term synaptic plasticity refers to changes in synaptic strength that occur on a sub-second timescale, while long-term synaptic plasticity can last anywhere from minutes to hours, days, or years.
The idea that synapses could change and that this change depended on how active or inactive they were was first proposed in 1949 by Canadian psychologist Donald Hebb. This concept, known as Hebbian learning, states that new synapses are produced when neurons fire simultaneously. Synaptic plasticity is thought to be one of the important neurochemical foundations of learning and memory. It is also believed to play a key role in the early development of neural circuitry and the capacity of the brain to incorporate transient experiences into persistent memory traces. For example, intense learning has been associated with grey matter volume increases in the adult brain, indicating a gain of structure plasticity with both synaptic and astrocyte remodeling.
Experiences, such as learning in a classroom, a stressful event, or ingestion of a psychoactive substance, can impact the brain by modifying the activity and organization of specific neural circuitry through synaptic plasticity. Synaptic transmission can be either enhanced or depressed by activity, and these changes can span temporal domains ranging from milliseconds to hours, days, and presumably even longer. There are several underlying mechanisms that contribute to synaptic plasticity, including changes in the quantity of neurotransmitters released into a synapse and changes in how effectively cells respond to those neurotransmitters. Synaptic plasticity in both excitatory and inhibitory synapses has been found to be dependent upon postsynaptic calcium release. Additionally, the spatial location of biochemical interactions is also important for the strength and regulation of synaptic plasticity.
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Frequently asked questions
Neuroplasticity, or brain plasticity, is the ability of the nervous system to change its activity in response to intrinsic or extrinsic stimuli by reorganizing its structure, functions, or connections.
Experience-dependent plasticity is a type of neuroplasticity that is driven by sensory experience. It is a critical process for recovery after brain damage.
Experience-dependent plasticity allows the brain to reorganize its neural circuitry based on experience, learning, and sensory input. This can lead to the recovery of lost functions.
Understanding the principles of experience-dependent plasticity can inform rehabilitation strategies for individuals with brain damage. By using learning as a tool for brain recovery, alongside other therapies, the brain can reorganize itself and potentially regain lost functions.
Examples of experience-dependent plasticity include circuit and network changes that result from learning a new ability, information acquisition, environmental influences, and psychological stress.
