Who Is the ‘Third Man’ at the Edge of Survival?

Alone, yet not alone

Accounts by stranded explorers repeatedly describe a companion beyond the actual number present. After the 1916 crossing of South Georgia, Ernest Shackleton recalled the sense that four people, rather than three, had travelled together.

The presence is usually less a clearly identified person than a companion that guides or sustains. ‘Third Man’ is a literary name joining different extreme experiences, not a diagnosis with one proven cause.

• Ernest Shackleton, South

  Shackleton’s account that all three men felt another person accompanied them across South Georgia.

The sensed-presence account

Neuroscience studies the feeling that someone is nearby when no person is visible as a sensed presence. In 2006, researchers repeatedly induced such a presence behind one patient during presurgical epilepsy evaluation by stimulating the left temporoparietal junction.

Because the presence seemed to mirror the patient’s posture, the researchers proposed a disruption in multisensory processing of body and self. This single case does not explain every survival account through one brain region.

• Arzy et al., Nature 443 (2006)

  A single-patient report in which left temporoparietal stimulation repeatedly induced an illusory presence.

A companion made by a brain in crisis?

Isolation, sleep loss, hypoxia, pain, and fear can disturb sensation and self-perception. Stories in which a companion helped someone survive give the experience a function, but do not by themselves prove an independent being or one universal survival mechanism.

The records establish experience; experiments suggest possible mechanisms. Keeping those layers apart makes the question more precise.

What remains

Is the Third Man an external other, a displaced representation of the body, or a dialogue created by a self under threat? Current evidence leaves several possibilities open and asks us to separate experience from interpretation.