Cardiac responses to visual detection of movement, mechanostimulation and cheliped imposed movement in hermit crabs

1. 1. Visual detection of movement causes a general alert pattern and cardiac arrests. 2. 2. The characteristics of habituation of motor and cardiac responses are different. 3. 3. Mechanical stimulation is irrelevant in causing any cardiac response. 4. 4. Imposed cheliped extension causes cardiac arrests and bradycardia, but not a clear motor response. The cardiac response does not habituate in the same experimental conditions used for motion detection. 5. 5. In centrally organized motor patterns, prolonged cardiac responses (cardiac arrests and bradycardia) are observed. © 1980.