FILLED INTERVALS ARE PERCEIVED AS LONGER THAN EMPTY ONES: THE EFFECT OCCURS EVEN WITH A BETWEEN-SESSION DESIGN
The timing literature usually reveals that, for a same physical duration, filled intervals are perceived as being longer than empty ones. This effect is known to occur when filled and empty intervals are randomized within a same block of trials. In the present experiment, the magnitude of the effect was tested with three experimental designs: filled and empty intervals grouped by sessions, by blocks, or randomized within blocks. The results tended to show that filled durations are perceived as longer than empty intervals, and this potential effect does not seem to be reduced by the use of a between-session design. Finally, higher sensitivity was observed with empty intervals, which is inconsistent with a portion of the literature.