Before revision:  In principle they are especially suitable for computations in the temporal domain , such as speech processing, because their computations are carried out via events in time and space. But so far they have been lacking the capability to preserve information for longer time spans during a computation, until it is updated or needed - like a register of a digital computer. This function is provided to artificial neural networks through Long Short-Term Memory (LSTM) units.
After revision:  In principle they are especially suitable for computations in the temporal domain , such as Long Short-Term Memory (LSTM) units.