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Placebos are drugs or other sources of treatment that are physically and pharmacologically inert, without any direct therapeutic effects. The neurobiological mechanisms of the placebo effect remain a matter of great research interest.

The placebo response is a set of complex psycho-neurobiological mechanisms; it is believed that verbal suggestions and conditioning cues can recruit simple forms of memory capable of triggering multiple types of responses, including autonomic and neuroendocrine responses, emotions and motivated behaviors. Therefore, this is a rather complex research subject that needs to incorporate diverse fields of neuroscience, such as pharmacology, neurophysiology and cognitive and behavioral neuroscience.

Source: The Placebo Effect – Beyond Analgesia | Brain Blogger