A Cockroach 'Collective Memory' Emerges From Their Social Networks, Study Suggests

Researchers studied American cockroaches placed in paired shelters with different lighting conditions.

In larger groups, the roaches often kept choosing the same shelter even after the lights were switched, because crowd attraction outweighed the new cue.

Simulations showed this “collective memory” can emerge without any individual insect storing a memory, driven instead by social interactions and group structure.

The findings help explain how animal collectives can persist in old choices—or adapt—when their environment changes.