Brain to brain technology on rats

Two rats are trained to press a lever when a light indicator is on, receiving water as a reward. Their brains are connected using microelectrodes, allowing them to be separated by large distances. The encoder rat sees a light and presses a lever, sending a signal to the decoder rat. If the decoder rat presses the correct lever, both receive water. If incorrect, the encoder rat's brain signal strengthens.

What is the consequence if the decoder rat presses the wrong lever?

What effect does the decoder rat's action have on the encoder rat's brain signal?