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Categorization of neuroimaging techniques
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Electroencephalography is an imaging technique that registers a human brain’s electrical activity generated by the human brain’s physiological structures (Niedermeyer and Silva 2004). In other words an Electroencephalogram (EEG) can be defined as the electrical activity of human brain recorded from the scalp or the surface of the human brain using conductive electrodes and conductive media (Atwood and MacKay 1989).
All the direct and indirect techniques that are used to produce an image of the physiological structure, functions, and pharmacology of the human brain are cumulatively known as Neuroimaging (Smith and Kerri 2008). It can be broadly classified into two categories:
•Structural imaging
It covers the analysis of the physiological and anatomical structure of the human brain
(Smith and Kerri 2008).
•Functional Imaging
It is used using to evaluate brain functions, often targeting to understand the relationship between specific mental functions and activity due to these mental conditions technically known as the cognitive state of mind within specific brain areas. It involves a...
Prior to the invention of the daguerreotype, the Camera Obscura was the main optical instrument that was used to project images onto paper. The Camera Obscura was a device in the shape of a box that allowed light, which was being reflected from the images that the user was intending to capture, to enter through an opening at one end of the box to form an image on a surface and an artist would then trace the image to form the most accurate impression of an image at that peri...
The brain has four major lobes. The frontal lobe, the parietal lobe, the occipital lobe, and temporal lobe are responsible for all of the activities of the body, from seeing, hearing, tasting, to touching, moving, and even memory. After many years of debating, scientist presents what they called the localization issue, Garret explains how Fritsch and Hitzig studied dog with conforming observations, but the cases of Phineas Gage’s accident in 1848 and Paul Broca’s autopsy of a man brain in 1861 really grabbed the attention of an enthusiastic scientific community (Garret 2015 p.6)
A process based on selection instead of synthesis-the invention of photography provided a radically new picture making process. As different materials we...
This paper aims to endorse physicalism over dualism by means of Smart’s concept of identity theory. Smart’s article Sensations and the Brain provides a strong argument for identity theory and accounts for many of it primary objections. Here I plan to first discuss the main arguments for physicalism over dualism, then more specific arguments for identity theory, and finish with further criticisms of identity theory.
where people decided to reproduce art as a picture of what was going on. Instead, this artistic
Epilepsy, also known as “seizure disorder,” or “seizure attack,” is the fourth most common neurological disorder known to mankind, affecting an estimated 2.3 million adults and 467,711 children in the United States. Unfortunately this disorder is becoming far more common and widespread worldwide. This staggering number of cases of people suffering from Epilepsy also involves an average growth rate of 150,000 new cases each year in the United States alone. Generally, many of the people who develop who are a part of the new are mainly either young children or older adults. Your brain communicates through chemical and electrical signals that are all specialized for specific tasks. However, through the process of communication, chemical messengers, also known as neurotransmitters can suddenly fail, resulting in what is known as a seizure attack. Epilepsy occurs when a few too many brain cells become excited, or activated simultaneously, so that the brain cannot function properly and to it’s highest potential. Epilepsy is characterized when there is an abnormal imbalance in the chemical activity of the brain, leading to a disruption in the electrical activity of the brain. This disruption specifically occurs in the central nervous system (CNS), which is the part of the nervous system that contains the brain and spinal cord. This causes an interruption in communication between presynaptic neurons and postsynaptic neurons; between the axon of one neuron, the message sender and the dendrite of another neuron, the message recipient. Consequently, the effects that epileptic seizures may induce may range anywhere from mild to severe, life-threatening ramifications and complications. There are many different types of seizures associa...
Technology and the Brain As a college student, using the internet and technology is a daily task. Everything you need for your classes: schedules, homework, quizzes, and even tests are all online. The debate on technology and the brain suggests that technology may have an effect on the brain, effect multi-tasking, and cause addiction. Brain Activity
Historically, cognitive psychology was unified by an approach based on an resemblance between the mind and a computer, (Eysenck and Keane, 2010). Cognitive neuroscientists argue convincingly that we need to study the brain while people engage in cognitive tasks. Clearly, the internal processes involved in human cognition occur in the brain, and several sophisticated ways of studying the brain in action, including various imaging techniques, now exist, (Sternberg and Wagner, 1999, page 34).Neuroscience studies how the activity of the brain is correlated with cognitive operations, (Eysenck and Keane, 2010). On the other hand, cognitive neuropsychologists believe that we can draw general conclusions about the way in which the intact mind and brain work from mainly studying the behaviour of neurological patients rather than their physiology, (McCarthy and Warrington, 1990).
This source states that women living with epilepsy seem to face different issues than males with epilpesy do. The source states that the two sex hormones inside a woman's body, progesterone and estrogen, play a role in influencing seizures as both of these hormones interact with brain cells. Usually, there are equal amounts of progesterone and estrogen inside a woman's body. However, the problem occurs when the balance of these becomes unequal. It explains that estrogen is an excitatory hormone which basically means that it "makes brain cells give off more of an electrical charge". Prosgesterone, however, is an inhibitory hormone, meaning that it calms the cells - that have been electrically charged by the estrogen - down. The problem arises when the body starts producing more estrogen than progesterone which "can make the nervous system excitable" and can make a woman with epilepsy more exposed to seizures. The source emphasises that a change in hormones don't cause the seizures but they are able to inluence the occurence of seizures. About 10% - 12% of women (with epilepsy) have catamenial epilepsy which means that their seizures are directly affected by their menstrual cycle. The seizures tend to occur when a lot of estrogen is present during the body such as during ovulation. For some others, the seizures can occur when the progesterone levels in the body drop such as during menstruation. It is said that as many as" 40% of menstrual cycles in women with epilepsy do not release an egg" and that women with epilepsy generally produce eggs less often than the normal ...
In persons suffering from epilepsy, the brain waves, electrical activity in the part of the brain called the cerebral cortex, have a characteristically abnormal rhythm produced by excessive electrical discharges in the nerve cells. Because these wave patterns differ markedly according to their specific source, a recording of the brain waves, known as an electroencephalogram (EEG) is important in the diagnosis and study of the disorder. Diagnosis also requires a thorough medical history describing seizure characteristics and frequency.
Memory is the mental process of retaining and retrieving information such as facts, events, and experiences. Memory is not always accurate (Hunt, 2004). Memory errors are common and natural; they are the result of normal cognitive processes of comprehension and perception, which can cause interference about incoming information. There are two errors of remembering; forgetting an event that occurred and remember an event that never occurred or remembering it in a way different from how it occurred. Memories can be distorted, and one may have no awareness that the memory is distorted. This is false memory (Roediger, 2002).
Two dimensional computer generated imagery was used to express depth and to produce new shades that could not be depicted just through animation and drawing.
Since the brain is extremely fragile and difficult to access without risking further damage, imaging techniques are used frequently as a noninvasive method of visualizing the brain’s structure and activity. Today's technology provides many useful tools for studying the brain. But even with our highest technology out there we do not know everything definitely. We do have fallbacks at times and these fallbacks can lead to serious problems.
As the human body goes through different experiences, the brain grows, develops, and changes according to the environmental situations it has been exposed to. Some of these factors include drugs, stress, hormones, diets, and sensory stimuli. [1] Neuroplasticity can be defined as the ability of the nervous system to respond to natural and abnormal stimuli experienced by the human body. The nervous system then reorganizes the brain’s structure and changes some of its function to theoretically repair itself by forming new neurons. [2] Neuroplasticity can occur during and in response to many different situations that occur throughout life. Some examples of these situations are learning, diseases, and going through therapy after an injury.
Most of the body’s functions such as, thinking, emotions, memories and so forth are controlled by the brain. It serves as a central nervous system in the human body. The mind is the intellect/consciousness that originates in the human brain and manifests itself in emotions, thoughts, perceptions and so forth. This means that the brain is the key interpreter of the mind’s content. Jackson and Nagel seem to resist identifying what we call “mental events” with brain events, for different reasons, while J.J.C. Smart takes the opposing view.