When the bucket is full a percept is formed. The
bucket is a statistical function which relates the
probability that data points are logically
connected in a recurring figure. The recurring
figure is a percept. What quantity of data points
is sufficient to draw a conclusion (percept) is
determined primarily by context development.
Percepts acquired later (example - visual percepts not available before birth) may be increasingly distinct because a percept forming context then exists. The number of data points needed to confirm a valid percept is the same as the quantity in the already acquired context.
Thereafter, the same set of sensual inputs triggers the percept, the use of which becomes new contextual data which fills another bucket. When a 'set of perceptions' bucket is filled another percept is formed.
This is the fundamental function of the mind: the creation of a hierarchical structure of percepts. And the empirical method used (accumulated experience) may be termed 'free induction' No mental 'effort' is required by this method.