Intensity scale for the responses of P. argus to stimuli
| Score . | Behavior toward stimulus . |
|---|---|
| 3 | Lobster moves toward the stimulus and forward to the front of the aquarium,shuffling its front legs against the aquarium walls |
| 2 | Lobster moves toward the stimulus and forward to the front of the aquarium and at least two body lengths from initial position but does not shuffle its legs against the aquarium walls |
| 1 | Lobster moves half a body length forward |
| 0 | Lobster does not move forward or backward from the stimulus |
| –1 | Lobster moves backward half a body length and lowers against the substrate |
| –2 | Lobster moves backward at least one body length or inside shelter from outside |
| –3 | Lobster moves backward inside the shelter and moves up the ramp of the shelter |
| Score . | Behavior toward stimulus . |
|---|---|
| 3 | Lobster moves toward the stimulus and forward to the front of the aquarium,shuffling its front legs against the aquarium walls |
| 2 | Lobster moves toward the stimulus and forward to the front of the aquarium and at least two body lengths from initial position but does not shuffle its legs against the aquarium walls |
| 1 | Lobster moves half a body length forward |
| 0 | Lobster does not move forward or backward from the stimulus |
| –1 | Lobster moves backward half a body length and lowers against the substrate |
| –2 | Lobster moves backward at least one body length or inside shelter from outside |
| –3 | Lobster moves backward inside the shelter and moves up the ramp of the shelter |