Omar Khalid
Plasticity, in the context of geography, refers to the ability to change shape or deform permanently when subjected to external forces, stresses, or environmental conditions. This phenomenon, known as plastic deformation, occurs in various materials, including metals, soils, rocks, concrete, and foams. It is a critical aspect of geological processes, such as rock folding and rock flow within the Earth under high pressures and temperatures. In the field of geography, understanding the plasticity of these materials is essential for studying Earth's processes and landforms.
| Characteristics | Values |
|---|---|
| Definition | The capacity of organisms with the same genotype to vary in developmental pattern, phenotype, or behavior according to varying environmental conditions |
| Synonyms | Malleability, Elasticity, Ductility |
| Scientific Definition | The ability of certain solids to flow or to change shape permanently when subjected to stresses of intermediate magnitude |
| Other Meanings | Mathematical descriptions of what happens in plastic deformation in terms of stresses, strains, and loads |
| Physical explanations of plastic flow in terms of atoms, crystals, grains, and motions of structural defects within crystals | |
| The brain's ability to adapt and change over time | |
| The ability to retain a shape attained by pressure deformation |
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What You'll Learn
Brain plasticity
The term )"plasticity" was first applied to behaviour in 1890 by William James in 'The Principles of Psychology'. He used the term to describe "a structure weak enough to yield to an influence, but strong enough not to yield all at once". The first person to use the term "neural plasticity" appears to have been the Polish neuroscientist Jerzy Konorski.
The human brain is composed of approximately 100 billion neurons. Early researchers believed that neurogenesis, or the creation of new neurons, stopped shortly after birth. However, it is now understood that the brain's neuroplasticity allows it to reorganise pathways, create new connections, and, in some cases, even create new neurons.
Neuroplasticity is the brain's ability to change and adapt due to experience. It is an umbrella term referring to the brain's ability to change, reorganise, or grow neural networks. This can involve functional changes due to brain damage or structural changes due to learning. Plasticity refers to the brain's malleability or ability to change; it does not imply that the brain is plastic. Neuro refers to neurons, the nerve cells that are the building blocks of the brain and nervous system. Thus, neuroplasticity allows nerve cells to change or adjust.
Functional plasticity is the brain's ability to move functions from a damaged area of the brain to other undamaged areas. Structural plasticity is the brain's ability to change its physical structure as a result of learning. The first few years of a child's life are a time of rapid brain growth. At birth, every neuron in the cerebral cortex has an estimated 2,500 synapses, or small gaps between neurons where nerve impulses are relayed. By the age of three, this number has grown to a whopping 15,000 synapses per neuron. The average adult, however, only has about half that number of synapses. This is because as we gain new experiences, some connections are strengthened while others are eliminated, in a process known as synaptic pruning. Neurons that are used frequently develop stronger connections, while those that are rarely or never used eventually die.
Neuroplasticity was once thought to manifest only during childhood, but research in the latter half of the 20th century showed that many aspects of the brain can be altered (or are "plastic") even through adulthood. The brain tends to change a great deal during the early years of life, as the immature brain grows and organises itself. Young brains tend to be more sensitive and responsive to experiences than older brains. However, this does not mean that adult brains are incapable of adaptation.
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Plastic deformation
Plasticity is the quality or state of being plastic, or the capacity to be moulded or altered. In the context of geography, plasticity can refer to the ability of certain solids to flow or change shape permanently when subjected to specific levels of stress, temperature, or pressure. This phenomenon is known as plastic deformation.
In the field of engineering, understanding plastic deformation is paramount. It defines the physical properties of everyday objects and plays a crucial role in various industrial processes. Materials exhibit different behaviours under varying conditions, and plastic deformation is a fundamental concept in comprehending these behaviours.
The understanding and management of plastic deformation are essential in engineering to mitigate fractures and failures in materials. By studying the underlying mathematical equations and the influence of dislocations, engineers can develop strategies to manage and prevent plastic deformation-related issues in various applications.
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Human development
Plasticity, in the context of geography and human development, refers to the ability to adapt and change in response to social and environmental surroundings. This concept is known as developmental plasticity and is influenced by both genetic factors and interactions with the environment.
Developmental plasticity refers to the changes in neural connections that occur during human growth and development. These changes are influenced by environmental interactions and learning experiences. The brain's plasticity allows it to adapt and change over time, forming new neural connections and growing in intelligence. This is particularly evident during early childhood, where critical periods shape lasting changes in neural connections.
Environmental conditions experienced in early life can significantly impact human biology, growth, maturation, and long-term health. For example, early life nutrition and stress can influence the risk of developing metabolic and cardiovascular diseases later in life. Parental caregiving behaviours and attachment patterns can also act as environmental cues that influence offspring development.
Additionally, plasticity can be observed in the ability of humans to exhibit phenotypic plasticity, or the capacity to change physical traits, behaviour, or physiology in response to their environment. This adaptability increases the chances of survival and reproductive success in changing environments.
The concept of plasticity as a developing trait suggests that early parental cues and experiences can modulate an individual's level of plasticity to future environmental cues. This implies that plasticity itself can be shaped by genes and previous interactions with the environment. Overall, plasticity plays a crucial role in human development, allowing humans to adapt and thrive in diverse geographic and social environments.
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Biological and psychological development
The term plasticity has been used for at least a century in the scholarly study of human development, particularly in the fields of psychology and biology. In its most basic sense, plasticity refers to the capacity for something to be moulded, shaped, or altered.
Plasticity is a critical concept in understanding human development and change throughout life. It is relevant to theories of cognitive ageing, and provides a basis for understanding how humans change as they grow older, and how they might change given certain experiences.
In biological and psychological development, plasticity refers to the range of possible variations that can occur in an individual's development. It can be understood as the ability to adapt and change over time in response to environmental conditions. This is also referred to as developmental plasticity.
Developmental plasticity is of great interest to researchers in medicine, public health, psychology, economics, and sociology. This is because it helps to explain the link between early conditions and adult health, which is important for disease treatment and prevention. For example, early life environments can have a profound impact on traits related to human health, such as higher rates of obesity, heart disease, and schizophrenia in adulthood for those exposed to famine in utero.
Individual differences in plasticity are influenced by both genetics and the environment. Research has shown that early experiences can shape an individual's plasticity to later environmental factors. This is known as 'differential susceptibility', where individuals with increased responsiveness to sensory stimulation and rewards may also be more developmentally plastic in response to early experiences.
Plasticity is also important in understanding the evolution of complex traits and the selection pressures that shape them. For instance, the immune response is a type of plasticity that has been studied to understand how individuals of different genetic ancestries differ in their responses to pathogens.
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Plasticity in nature
In biology, plasticity refers to the capacity of organisms with the same genotype to exhibit variations in phenotype, behaviour, and developmental patterns in response to changing environmental conditions. This is achieved through the formation of new neural connections and the modification or elimination of existing ones. For example, viral genomes can add plasticity to their genome, enabling them to adapt to a particular environment and facilitate speciation.
Psychology explores the plasticity of the brain and nervous system, which allows for "newer, intelligent accommodations". This includes the brain's ability to adapt and grow, and recover from damage through the formation of new neural pathways and synapses.
Anthropological studies further demonstrate the plasticity of humans in response to social and environmental forces. This highlights how humans can exhibit remarkable behavioural plasticity, adapting their behaviour to changing conditions.
In physics and materials science, plasticity is defined as the ability of a solid material to undergo permanent deformation, or a non-reversible change of shape, in response to applied forces. This occurs when the stress on a material exceeds a critical value, resulting in irreversible deformation. Materials exhibiting plasticity include metals, soils, rocks, concrete, and foams.
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Frequently asked questions
Plasticity is the ability of a solid material to undergo permanent deformation, a non-reversible change of shape in response to applied forces. It is also used to describe the brain's ability to change and adapt.
The term plasticity was first used in the psychological and biological literature over a century ago. It was defined by James Mark Baldwin and E. B. Poulton in the 1901 Dictionary of Philosophy and Psychology as "that property of living substance or of an organism whereby it alters its form under changed conditions of life".
Plasticity is observed in a variety of materials, including metals, soils, rocks, concrete, and foams. It is also observed in biological tissues and the brain, where it refers to the ability to form new neural connections and adapt to new experiences or injuries.
Plasticity in geography refers to the ability of certain solids, such as rocks, to change shape or undergo deformation in response to external forces or environmental conditions. It is a concept used to understand geological processes such as rock folding and flow within the Earth under high pressures and temperatures.
