The Halle Berry Neuron

The discovery of the “Spiderman Neuron” in AI models is actually a direct parallel to a famous discovery in human neuroscience: the Halle Berry Neuron.

In 2005, researchers studying epileptic patients with implanted brain electrodes discovered a single neuron in a patient’s medial temporal lobe that fired exclusively in response to Halle Berry.

It fired when the patient saw:

  • A photo of Halle Berry.
  • A drawing of Halle Berry.
  • Halle Berry dressed as Catwoman.
  • The written text “Halle Berry”.

It didn’t fire for other actresses, or even for pictures of Halle Berry that didn’t look like her. It was a concept cell: a neuron that had learned the abstract identity of a specific person, completely invariant to the visual medium.

interpretabilityneuroscience