Table 1.

Description of motor behaviors and sequence of pulse intervals

Motor behavior
   FleeAn arching of the body and avoidance of a potential attack
   FollowThe act of swimming closely behind a fish around and through objects in the tank
   Head-to-tail circlingMale and female follow each other in tight circular motion with the head of each sex near the other's caudal fin
   HoverStationary position with fins moving to stabilize position
   LungeA fish swims rapidly, directly and deliberately at an opponent head first that causes the receiver to arch in an escape response
   No activityLaying on ventral side with no fin movement
   ProbingStationary or back-and-forth movement of body around an object leading with head or tail
   SwimBroad category where there is forward movement not directed at other fish
   SpawningRapid undulation of body in vent-to-vent coupling position
   CreakTotal duration of 2000–3000 ms and characterized by a cessation prior to slow discharges (100–300 ms) followed by a burst at about 50 ms and a subsequent cessation
   Gradual increaseA fast burst followed by an increase of interval length to 60–100 ms over a period of 2000–6000 ms
   Fast burstSeries of pulses with intervals of 10–30 ms lasting no longer than 1000 ms
   Long cessationNo EODs for longer than 1000 ms
   Medium burstSeries of pulses with intervals of 30–70 ms lasting no longer than 1000 ms
   RandomNo discernable SPI pattern
   RaspBurst of 4–10 pulses with 10–20 ms intervals followed by longer intervals of 25–50 ms
   Rasp matchingAlthough not an SPI by one individual, it is an electrical duet between the sexes during courtship. Male rasps or medium bursts would be followed by female fast bursts or vice versa. Varying duration of event and number of rasps, medium bursts and fast bursts produced
   RegularizationSustained EOD intervals (±10 ms) for longer than one second
   ScallopSudden burst of 8–12 pulses of 10–20 ms from resting intervals (100–300 ms) and back
   Short cessationNo EOD activity for 200–1000 ms. Shorter cessations included in this category when a clear stop and start of two SPI patterns is evident
   Slow burstSeries of pulses with intervals of 70–100 ms lasting no longer than 1000 ms
   SPI, sequence of pulse interval.
   EOD, electric organ discharge.