Categorise the following under stimulus and response.
(ii) Seeing a green light turning into red at a road crossing before applying the brakes
Answer: Stimulus
The importance of "watching" the green light turn red at a road crossing is emphasised here. The message of green light changing red is sensed by the sensory nerves. This message is sent to the brain by these nerve cells. The brain understands the message (that we should apply the brake) and delivers it to the muscles that express the response via the motor neurons (applying the brake).