How fast do signals travel through the brain?

Nerve signals travel at speeds that depend on the fibre. Thin, unmyelinated fibres carry pain and temperature signals at 0.5 to 2 m/s; thick, myelinated motor and touch fibres run at up to about 120 m/s (430 km/h). That is why a stubbed toe hurts twice: a sharp first pain arrives quickly on fast fibres, and a dull ache follows on the slow ones.

Source: Kandel et al., Principles of Neural Science (6th ed., 2021)