Non-invasive cerebellar stimulation (NICS) is the application of non-invasive neurostimulation techniques on the cerebellum to modify its electrical activity. Techniques such as transcranial magnetic stimulation (TMS) or transcranial direct current stimulation (tDCS) can be used. The cerebellum is a high potential target for neuromodulation of neurological and psychiatric disorders due to the high density of neurons in its superficial layer, its electrical properties, and its participation in numerous closed-loop circuits involved in motor, cognitive, and emotional functions. Cerebellar TMS is a relatively new field that is undergoing experimental research. A review of scientific literature (2024) has identified hypotheses of underlying processes of different non-invasive neurostimulation techniques. Data analysis revealed that mitochondrial activity plays a central role in all of them. This insight and findings from an analysis of the mother-fetus neurocognitive model constituted the hypothesis of natural brain stimulation. According to this hypothesis, the interactions within the mother-fetus bio-system of acoustic waves, electromagnetic fields, and chemical interactions synchronize their brain oscillations, affecting neuroplasticity in the fetus. At the same time, ecological dynamics during the mother's intentional acts provide a clue to the fetus's nervous system, linking synaptic activity with appropriate stimuli. These processes enable the child's nervous system to evolve with adequate biological sentience. During pregnancy, the mother's body produces this set of physical interactions that provide natural neurostimulation to form the balanced nervous system in the child. Therefore, the balanced architecture of the child's nervous system appears with specific cognitive functions, contributing to the beginning of cognition. It is thought that existing neurostimulation techniques are just exceptional cases of this universal natural sequence of actions, a part of a natural flow of physical interactions in nervous system development during pregnancy. However, there is not yet sufficient evidence of the therapeutic effects of cerebellar TMS, although some successful results have been reported in other clinical studies of TMS used to treat the frontal lobe. NICS is a neural modulation technique, showing capability to rehabilitate the brain functions of patients undergoing a plethora of neurological or psychiatric diseases. There are 3 forms of NICS which are primarily used; transcranial magnetic stimulation (TMS), transcranial direct current stimulation (tDCS) and transcranial alternating current stimulation (tACS). NICS targets the cerebellum, due to the high density of neurons at its superficial layer (the cerebellar cortex), the electrical properties, and network to neural circuits (involved in motor, cognitive, and emotional functions). Due to the success of clinical trials in response to rehabilitating sensorimotor functions and cognition, more money is being invested in NICS research. NICS has the potential to attack multiple neurological and psychiatric disorders, although NICS is still not included and heavily advocated in clinical treatment. This is due to contingent conclusions regarding NICS effects. Further research is still required to confirm and identify the optimal parameters to target these regions.
Existing NICS methods The non-invasive electroceutical neurostimulation encompasses five approaches:
Photonic neurostimulation through the image-forming vision pathways and skin irradiation. This technique is known as Light therapy, and also known as Phototherapy or Luxtherapy. It refers to the body's exposure to intensive electrical light at managed wavelengths to treat different diseases. Transcranial laser radiation refers to directional low-power and high-fluence monochromatic or quasimonochromatic light radiation, also known as photobiomodulation (PBM). Transcranial electric current and magnetic field stimulations; Low-frequency sound stimulations, including vibroacoustic therapy (VAT) and rhythmic auditory stimulation (RAS). Acoustic photonic intellectual neurostimulation (APIN). It applies features of natural neurostimulation during pregnancy scaled on specific patients. Three therapeutic agents cause oxygenation of neuronal tissues, release of adenosine-5′-triphosphate proteins, and neuronal plasticity. This method shows significant results in chronic pain management in various conditions. The three most distinguished NICS methods include transcranial magnetic stimulation (TMS), transcranial direct-current stimulation (tDCS) and transcranial alternating current stimulation (tACS). All methods involve the targeting to the cerebellar region of interest. However collectively the effects of these treatments are not fully disclosed. Multiple theories have been suggested; 1) NICS influences the excitability of cerebellar neurons and in the connectivity between cerebellar and other brain regions, which henceforth alters the cerebellums motor and cognitive functions. 2) NICS can induce variations in plasticity (ability of nervous system to adapt its activity in response to stimuli), which create long-lasting effects behaviour and cognition. 3) NICS induces selectivity of the activation and/or inhibition of specific neural circuits within the cerebellum.
Transcranial magnetic stimulation (TMS) TMS utilises a magnetic field to induce a brief electrical impulse which stimulates neurons within the cerebral cortex. This targets the cerebral cortex through electromagnetic induction. Its general mechanism is applying a magnetic field in the form of coil to the scalp which then influences your motor cortex. TMS itself has variations in terms of magnet strength, pulse frequency, pulse patterns (rTMS), magnetic coil type and stimulation target. Depending on its target use, these factors can be manipulated specific to the target disease. This is a method which is FDA approved and primarily utilized for mental illnesses such as depression.
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