«Frog neurons, like those in people and other animals, receive the same
type of chemical inputs, but it's been a major challenge to understand how they work together to enable to enable the neurons to compute the length of a sound,» Rose says.
To test this
type of communication in a 3 - D structure, they printed a thin sheet
of hydrogel filaments with «
input,» or signal - producing bacteria and
chemicals, overlaid with another layer
of filaments
of an «output,» or signal - receiving bacteria.