Answer :
A burst activity has more than one dependency arrow flowing from it.
When more than one activity departs an event, it is referred to as a "burst event."
Bursting describes brain activity patterns made up of bursts of relatively rapid spiking interspersed by periods of quiescence. The nervous system is filled with bursty neurons, which are crucial for the development of motor, sensory, and cognitive functions.
A dotted line with an arrow on it is a dependency arrow. You can either have one end attached and the other free when you draw a dependence arrow between items. It may have a label that you are allowed to shift about.
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