Going and going on different roads will not feel familiar. The fact that they all had the "road effect" helped the "expect" hypothesis have more evidence to support it.
Final research:
139 volunteers sat watching a video of a person going from home to your house and returning. The exact travel time is 7 minutes, although there are other road users to return to their homes.
The "way back effect" happened again, the volunteers estimated the journey took about 9 minutes and the return road took only 7 minutes.
Once again, the familiarity hypothesis is not present, since the estimated time of return is not different between two different routes. It is the expectations of the experimental participants that have the most influence on the "road effect".
More specifically, when some participants were told that the route would be longer than the way back (though not so), the "road effect" completely disappeared. This shows that, when they are informed that the road goes further, one will no longer feel depressed with the long distance and will be more accurate when estimating the way back.
Although Ven and his colleagues did not completely rule out the familiarity of the "road effect", they argued that "expectation" played a more important role. They concluded that:
"The return effect is affected by the interference in our expectations. Participants feel that the path is longer than expected, they will raise the expectations in the return distance. And when compared to The expectation of the road will be so long, they will feel the way back much shorter . "
There are many factors that influence this strange effect from psychology, emotion . And the most accurate answer is still in our own brains, but to understand we must rely on scientists with future experiments.