It is the ability that people have to select among many stimuli the thoughts that interest them most and discard or ignore those that do not. Ability to concentrate on the topics that interest us.
Salience is the ability to select thoughts between different stimuli, make them emerge and integrate them to focus attention on the information that interests most and leave the other stimuli muffled or canceled.
It is when a reflja concept the idea of all the characteristic of a stimulus, at a particular time, to receive the same attention.