The aesthetic–usability effect describes a paradox that people perceive more aesthetic designs as much more intuitive, than those considered to be less aesthetically pleasing. The effect has been observed in several experiments and has significant implications regarding the acceptance, use, and performance of a design. Usability and aesthetics are the two most important factors in assessing the overall user experience for an application. Usability and aesthetics are judged by a user's reuse expectations, and then their post-use, or experienced, final judgement. A user's cognitive style can influence how they interact with and perceive an application, which in turn can influence their judgement of said application.
Masaaki Kurosu and Kaori Kashimura, researchers at Hitachi in Tokyo, demonstrated the aesthetic-usability effect in their study. The results of the analysis show that “the apparent usability is less correlated with the inherent usability compared to the apparent beauty. ... This suggests that the user may be strongly affected by the aesthetic aspect of the interface even when they try to evaluate the interface in its functional aspects, and it is suggested that the interface designers should strive not only to improve the inherent usability but also brush up the apparent usability or the aesthetic aspect of the interface.” In other words, aesthetic usability effect play an important role in user experience.
The aesthetics factor
The aesthetics factor was manipulated by differing in terms of color combination, visual layout, and text font, which determine the level of aesthetics. According to the study by Hall and Hanna, users perceived websites with white–black and black–white color combinations as less pleasing and stimulating than ones with non-grayscale color combinations. A few previous studies Kurosu & Kashimura (1995) Tractinsky (1997) Tractinsky ( 2000) demonstrated a significant effect of visual layout on perceived aesthetics in experiments with Automated Teller Machine (ATM) layouts with different arrangements of content items. In an experiment using home robotic control systems, Conklin (2006) showed that the manipulation of interface aesthetics with the use of color, layout, and font style was successful. Moreover, McCracken and Wolfe (2004) recommended using of Georgia or Verdana font styles not intermixed in the body text of a website rather than Times New Roman or Arial intermixed in the body text.
The effect of cognitive style
Cognitive style is a characteristic of the user determined by the Cognitive Styles Analysis (CSA).The interface and functional features of an application can be harmonized or non-harmonized in accordance with a user's cognitive style. Cognitive styles could be classified into two groups of people-imager and verbalizer, or the Wholist-Analytic and the Verbal-Imagery dimension. So an application success might vary, depending on how it caters to individual cognitive style. Imagers are more influenced by aesthetics factor and tends to utilize the aesthetics features in understanding and using an application. In 2011, Sangwon Lee and Richard J. Koubeks showed results that the effect of aesthetics factor on pre-use preference was significantly different based on cognitive styles. There were significant differences in the pre-use preference of the changing aesthetics but not between the two types of cognitive styles of the test subjects. The same applied to the pre-use usability factor of the application as well. There was little difference in the effect of aesthetics on Wholist-Analytic versus Verbal-Imagery. This may be surprising considering that imagers think in pictures (visually), versus verbalizers who think in words. The effect of usability on the time performance was not significantly different between the two groups.
Cultural aesthetics for user interface design
Usability and aesthetics are two important factions for designing user interfaces. Thus, with the Internet being increasingly strong in the national marketplace, it is unreasonable to design a single common website for everyone and to expect it to attract the international audiences with the same aesthetic interface. What users perceive as beautiful and usable strongly depends on their cultural background. Thus, the cultural aesthetics is a reasonable way to improve user interfaces and Cultural Adaptivity is a way to increase that. The idea is that websites automatically compose personalised interfaces based on the individual cultural backgrounds of its users; this is a deep understanding of the term culture. There are several different factors of defining the user's cultural background, such as the user's first language, religion, the education level and the form of education and the social or political norm of the culture . All of those factors are very important aspects of defining the cultures of users and influencing the aesthetic direction of users.
The influence of design aesthetics in usability testing
Aesthetics designs are more effective at fostering positive attitudes than unaesthetic designs, and make people more tolerant of design problems. The design aesthetics is employed in two ways: it may refer to the objective features of a stimulus or to the subjective reaction to the specific product features. A study between two functionally identical mobile phones with highly appealing visual appearance not appealing visual appearance to determine the influence of appearance on perceived usability, performance measures and perceived attractiveness. The data confirmed that the aesthetically appealing prototype was rated significantly more attractive than the unappealing prototype. Furthermore, an interaction between prototype and product usage was found, showing an increase in the perceived attractiveness rating of the aesthetically appealing prototype after product usage whereas the attractiveness-rating of the unappealing prototype decreased after product usage. The main effect of product usage (before vs. after) was not significant. The results showed that participants using the highly appealing phone rated their appliance as being more usable than participants operating the unappealing model. Furthermore, the visual appearance of the phone had a positive effect on performance, leading to reduced task completion times for the attractive model.
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