Both patients and healthy individuals can volunteer for invasive brain recording trials. Patients who are undergoing neurosurgery procedures anyway may be asked to participate in a trial, but they are not required to do so. Healthy individuals may also volunteer for trials, but they are typically only accepted if they have a strong medical reason for doing so, such as a family history of a brain disorder.

The ethics of invasive brain recording trials is a complex issue. On the one hand, these trials have the potential to lead to significant advances in the understanding and treatment of brain disorders. On the other hand, they carry some risks, and participants must be fully informed of these risks before they consent to participate.

There are a number of factors that researchers must consider when deciding whether to conduct an invasive brain recording trial. These factors include the potential benefits of the trial, the risks to participants, and the availability of alternative research methods. Researchers must also ensure that the trial is designed and conducted in a way that is ethical and respectful of participants' rights.

Here are some specific examples of invasive brain recording trials that have been conducted with healthy volunteers:

* A 2019 study published in the journal *Nature Neuroscience* used invasive brain recording to study how people learn new skills. The study found that specific patterns of brain activity are associated with different stages of learning.
* A 2020 study published in the journal *Cell** used invasive brain recording to study how people make decisions. The study found that different brain regions are involved in different aspects of decision-making.
* A 2021 study published in the journal *Science** used invasive brain recording to study how people perceive and interact with the world around them. The study found that specific brain regions are involved in processing different types of sensory information.

These studies demonstrate that invasive brain recording trials can be conducted with healthy volunteers in a safe and ethical manner. However, it is important to note that these trials are still in their early stages, and more research is needed to fully understand the risks and benefits of this technology.

Ultimately, the decision of whether or not to volunteer for an invasive brain recording trial is a personal one. Participants should carefully weigh the potential benefits and risks before making a decision.
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