President Obama on Tuesday will announce a broad new research initiative, starting with $100 million in 2014, to invent and refine new technologies to understand the human brain, senior administration officials said Monday.

A senior administration scientist compared the new initiative to the Human Genome Project, in that it is directed at a problem that has seemed insoluble up to now: the recording and mapping of brain circuits in action in an effort to “show how millions of brain cells interact.”

It is different, however, in that it has, as yet, no clearly defined goals or endpoint. Coming up with those goals will be up to the scientists involved and may take more than year.

The effort will require the development of new tools not yet available to neuroscientists and, eventually, perhaps lead to progress in treating diseases like Alzheimer’s and epilepsy and traumatic brain injury. It will involve both government agencies and private institutions.