The word was introduced during the launch of its Ascend P7 smartphone in 2014. Huawei defines the groufie as a panoramic selfie involving multiple subjects, as well as background scenery, captured using the front facing, 8-megapixel camera and panorama capabilities of its phones. Another term for a group selfie is "wefie", originally trademarked by Samsung in the U.S. to promote the wide-angle lens of its NX series of cameras. Devices for holding smartphones or compact cameras called selfie sticks are often used when taking group selfies, as they allow a wider, more panoramic image capture. Another option for taking selfies from a distance beyond one's arm is a drone. Selfies made with a drone are also called dronies. The concept of taking a dronie first entered the mainstream in 2014 and coincided with a relatively sudden increase in the availability of relatively cheap, camera bearing multicopter drones. In 2014, the Nixie drone was designed to serve as a "personal photographer". First, Farace, van Laer, de Ruyter, and Wetzels describe three photography techniques with which people are more likely to engage: first-person perspective, action, and person rather than 'just' selfies and adaptation into artfulness. According to a study performed by Nicola Bruno and Marco Bertamini at the University of Parma, selfies by non-professional photographers show a slight bias for showing the left cheek of the selfie-taker. This is similar to observations of portraits by professional painters from many historical periods and styles, indicating that the left cheek bias may be rooted in asymmetries of brain lateralization that are well documented within cognitive neuroscience. In a second study, the same group tested if selfie takers without training in photography spontaneously adhere to widely prescribed rules of photographic composition, such as the rule of thirds. It seems that they do not, suggesting that these rules may be conventional rather than hardwired in the brain's perceptual preferences. A 2016 study examining the relationship between personality and selfie-posting behaviors suggests that extroversion and social exhibitionism positively predict frequency of selfie posting, whereas self-esteem is generally unrelated to selfie-posting behaviors. Selfitis is a condition described as the obsessive taking of selfies, although it is currently not listed as a mental disorder in the DSM-5. Obsessive taking of selfies and posting to social media has been found to be linked to many symptoms common to mental disorders. These include narcissism, low self-esteem, loneliness, self-centeredness, and attention-seeking behaviors.