Silver Threads shows consciousness studies in the context of scholarly investigation and liberal thinking. It was written to celebrate the 25th anniversary of the Parapsychology Research Group. However, the subject matter is not confined to parapsychology; the volume is, more generally, a collection of essays on and experiments in consciousness. It includes theoretical material on the philosophy of science and experimental reports. Many of the contributors are recognized as outstanding original researchers in the field of parapsychology, such as Targ, Honorton, Tart, Harman, Krippner, and Grof.

The contributors conclude that: (1) psychic phenomena are genuine and can be subject to scientific investigation; (2) science is changing to adapt to new categories of phenomena, including those which are considered paranormal; and (3) paranormal function is an innate human ability that everyone possesses and uses.