When brain cells (neurons) are acti

When brain cells (neurons) are activated, local current flows are produced. EEG measures mostly the currents that flow during synaptic excitations of the dendrites of many pyramidal neurons in the cerebral cortex. Differences of electrical potentials are caused by summed postsynaptic graded potentials from pyramidal cells that create electrical dipoles between soma (body of neuron) and apical dendrites (neural branches). Brain electrical current consists mostly of Na+, K+, Ca++, and Cl- ions that are pumped through channels in neuron membranes in the direction governed by membrane potential [2]. The detailed microscopic picture is more sophisticated, including different types of synapses involving variety of
neurotransmitters. Only large populations of active neurons can generate electrical activity recordable on the head surface. Between electrode and neuronal layers current penetrates through skin, skull and several other layers. Weak electrical signals detected by the scalp electrodes are massively amplified, and then
displayed on paper or stored to computer memory [3]. Due to capability to reflect both the normal and abnormal electrical activity of the brain, EEG has been found to be a very powerful tool in the field of neurology and clinical neurophysiology. The human brain electric activity starts around the 17-23 week of prenatal development. It is assumed that at birth the full number of neural cells is already developed, roughly 1011 neurons [4]. This makes an average density of 104 neurons per cubic mm. Neurons are mutually connected into neural nets through synapses. Adults have about 500 trillion (5.1014) synapses. The number of synapses per one neuron with age increases, however the number of neurons with age decreases, thus the total number of synapses decreases with age too. From the anatomical point of view, the brain can be divided into three sections: cerebrum, cerebellum, and brain stem. The cerebrum consists of left and right hemisphere with highly convoluted surface layer called cerebral cortex. The cortex is a dominant part of the central nervous system. The cerebrum obtains centres for movement initiation,
conscious awareness of sensation, complex analysis, and expression of emotions and behaviour. The cerebellum coordinates voluntary movements of muscles and balance maintaining. The brain stem controls respiration, heart regulation, biorythms, neurohormone and hormone secretion, etc.[5]. The highest influence to EEG comes from electric activity of cerebral cortex due to its surface position. There are some theoretical and practical differences between EEG and MEG. Although the MEG is produced by the same electrical currents, it can provide complementary information to EEG [6].

ผลลัพธ์ (อังกฤษ) 2:

When brain cells (neurons) are activated, local current flows are produced. EEG measures mostly the currents that flow during synaptic excitations of the dendrites of many pyramidal neurons in the cerebral cortex. Differences of electrical potentials are caused by summed postsynaptic graded potentials from pyramidal cells that create electrical dipoles between soma (body of neuron) and apical dendrites (neural branches). Brain electrical current consists mostly of Na +, K +, Ca ++, and Cl- ions that are pumped through channels in neuron membranes in the direction governed by membrane potential [2]. The detailed microscopic picture is more sophisticated, including different types of synapses involving Variety of
neurotransmitters. Only large populations of active neurons can generate electrical activity recordable on the head surface. Between electrode and neuronal layers current penetrates through skin, skull and several other layers. Electrical Signals detected by the weak scalp electrodes are Massively amplified, and then
displayed or stored on Paper to Computer memory [3]. Due to capability to reflect both the normal and abnormal electrical activity of the brain, EEG has been found to be a very powerful tool in the field of neurology and clinical neurophysiology. The human brain electric activity starts around the 17-23 week of prenatal development. It is assumed that at birth the full number of neural cells is already developed, roughly 1011 neurons [4]. This makes an average density of 104 neurons per cubic mm. Neurons are mutually connected into neural nets through synapses. Adults have about 500 trillion (5.1014) synapses. The number of synapses per one neuron with age increases, however the number of neurons with age decreases, thus the total number of synapses decreases with age too. From the anatomical point of view, the brain can be divided into three sections: cerebrum, cerebellum, and brain stem. The cerebrum consists of left and right hemisphere with highly convoluted surface layer called cerebral cortex. The cortex is a dominant part of the central nervous system. Cerebrum Obtains Centres Movement for the initiation,
Conscious awareness of Sensation, Complex Analysis, and Expression of Emotions and behavior. The cerebellum coordinates voluntary movements of muscles and balance maintaining. The brain stem controls respiration, heart regulation, biorythms, neurohormone and hormone secretion, etc. [5]. The highest influence to EEG comes from electric activity of cerebral cortex due to its surface position. There are some theoretical and practical differences between EEG and MEG. Although the MEG is produced by the same electrical currents, it can provide complementary information to EEG [6].

ผลลัพธ์ (อังกฤษ) 3:

When brain cells (neurons), are activated local current flows are produced. EEG measures mostly the currents that flow. During synaptic excitations of the dendrites of many pyramidal neurons in the cerebral cortex. Differences of electrical. Potentials are caused by summed postsynaptic graded potentials from pyramidal cells that create electrical dipoles between. Soma (body of neuron) and apical dendrites (neural branches). Brain electrical current consists mostly of Na +, K +, Ca + +,! And Cl - ions that are pumped through channels in neuron membranes in the direction governed by membrane 2 potential []. The. Detailed microscopic picture is more sophisticated including different, types of synapses involving variety of.Neurotransmitters. Only large populations of active neurons can generate electrical activity recordable on the head, surface. Between electrode and neuronal layers current penetrates through skin skull and, several other layers. Weak electrical signals. Detected by the scalp electrodes are massively amplified and then,,Displayed on paper or stored to computer memory [3]. Due to capability to reflect both the normal and abnormal electrical. Activity of the brain EEG has, been found to be a very powerful tool in the field of Neurology and clinical, neurophysiology. The human brain electric activity starts around the 17-23 week of prenatal development. It is assumed that at birth the. Full number of neural cells is already developed roughly 1011, neurons [4]. This makes an average density of 104 neurons. Per cubic mm. Neurons are mutually connected into neural nets through synapses. Adults have about 500 trillion (5.1014). Synapses. The number of synapses per one neuron with, age increases however the number of neurons with, age decreases thus. The total number of synapses decreases with age too. From the anatomical point of view the brain, can be divided into three. Sections:,, cerebrum cerebellum and brain stem. The cerebrum consists of left and right hemisphere with highly convoluted. Surface layer called cerebral cortex. The cortex is a dominant part of the central nervous system. The cerebrum obtains. Centres for, movement initiationConscious awareness, of sensation complex analysis and expression, of emotions and behaviour. The cerebellum coordinates. Voluntary movements of muscles and balance maintaining. The brain stem controls respiration heart regulation biorythms,,,, Neurohormone and, hormone secretion etc. [5]. The highest influence to EEG comes from electric activity of cerebral cortex. Due to its surface position. There are some theoretical and practical differences between EEG and MEG. Although the MEG. Is produced by the same electrical currents it can, provide complementary information to 6 EEG [].