Neurohacking is the colloquial term for (usually personal or 'DIY') neuroengineering. It is a form of biohacking (qv) focusing on the brain and CNS. Strictly speaking it is any method of manipulating or interfering with the structure and/or function of neurons for improvement or repair.
Mental health 
The main goal of neurohacking is optimal mental health. Other goals include damage repair, simulated reality, prevention of disease and augmentation of abilities or of intelligence overall. It utilises information and technology mainly from the fields of epigenetics, bio/neurofeedback, psychopharmacology, biological psychology and functional analysis, but many practitioners also employ physical exercise, nutritional guidelines, vitamins & supplements, meditation and/or self-hypnosis. Some avoid all neuroactive substances including caffeine, alcohol, food additives and fast-release sugars. Current research focuses on the nature and development of intelligence and how to increase or improve it. The works of Dr. Herman Epstein, Joseph LeDoux, Alex Ramonsky, Frederick Starr and David Barker are influential. The ethical basis of Neurohacking for health is that it should be practiced strictly with informed consent.
Information retrieval 
The term neurohacking is also used for a method of attempting to retrieve information from the brain (such as passwords, locations, etc..) without consent; presently no technology exists for such a tactic. The concept has been used in much science fiction (e.g. the film "The Matrix"). In data retrieval, some sort of brain–computer interface (BCI) is typically used, where the brains neuron synapses are somehow captured or recorded to be processed for information. Promoters of this concept generally refer to the MRI (magnetic resonance imaging) or MEG (magnetoencephalography) to support the plausibility of this concept. Although some sort of neuroimaging could someday be used, the accuracy of any present day method is not nearly close enough. For instance, it is assumed that neurohacking requires detection of the state of individual neurons (approximately 1 micrometer diameter) while the resolution of the MEG is several thousand neurons and other imaging systems may be even larger. It is estimated that usable neurohacking of this type is still many decades away.
Modern Applications 
Coffee, alcohol, drugs, and over the counter medicine are all forms of neurohacking. Every one of these substances alters or "tricks" the brain into desirable conditions. When drinking coffee, the brain is fooled into thinking the body has energy and keeps the consumer awake. The brain's neurons naturally produce adenosine as a byproduct which is monitored by the nervous system. Once the level of adenosine is at a certain point, the body will feel tired. Caffeine acts as fake adenosine and binds to the body's receptors. However, instead of disappearing, it blocks the adenosine receptors so the brain's stimulants, dopamine and glutamate, can work more freely. Since neurohacking is the interference with the structure and function of neurons, coffee is in fact a neurohack. Similarly, other substances that affect the brain and functions of neurons are also neurohacks. Alcohol is the most interesting form of neurohacking because it affects multiple neurotransmitters instead of just one. This is because alcohol is a fat soluble molecule. Since lipids are a major component of cell membranes, alcohol is able to enter the membranes of neurons and change their properties. Specifically, alcohol inhibits the glutamate receptor function, enhances GABA receptor function, raises dopamine levels, and raises endorphin levels. This causes all sorts of reactions, including liveliness and excitement. Alcohol also causes one to lose their anxieties, since alcohol makes GABA receptors After alcohol affects the system, it causes the body to go through what is called neurotransmitter rebound. This is because when alcohol takes effect, it overuses the GABA system so when it wears off, the GABA system makes the body feel restless.
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