In advanced classes, dogs perform searches that build endurance as well as discrimination between the odor «source» and other environmental distractions. (aercmn.com)
«In addition to dividing attention between the task and riding a bike, we noticed that brain activity associated with sensing and perceiving information was different when outdoors, which may indicate that the brain is compensating for environmental distractions.» (mindbodygreen.com)
NW2: recognizes proficiency in two target odors and increases the difficulty level with larger search areas, more hidden odors, and more environmental distractions (nacsw.net)