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The aim of this paper is to gain better understanding of the way map users read and interpret the visual stimuli presented to them and how this can be influenced. In particular, the difference between expert and novice map users is considered. In a user study, the participants studied four screen maps which had been manipulated to introduce deviati...

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... participants just had to indicate when they were ready. Hence, they would need to use (retrieve) the stored information again. In order to be able to use this information later on, it has to be stored in (working and long-term) memory in the form of chunks of information (or sche- mata) which are linked to other information stored in the LTM. This requires that the objects are read, recognized, and interpreted (given meaning) (see above). The process of “ remembering the map – drawing the map ” was repeated four times. After the completion of the fourth trial, participants were asked to fi ll out a questionnaire. This post-study questionnaire was used to obtain personal characteristics (expertise, age, gender, etc.) to verify their familiarity with the presented regions, and to receive feedback. In this paper, we did not test users ’ memory perfor- mance; this was done in Ooms et al. (forthcoming). We were interested in fi nding out where (and how) they looked at stimuli (or maps), namely how information is retrieved, how is it structured, and how much is retrieved. Thinking aloud, sketch maps and a questionnaire were used to study the information retrieval process. These fi ndings con fi rm that the participants would have had interpreted the information on the maps. Four maps from the Belgian 1:10,000 topographic map series were displayed on screen during the user study. The selected maps were not crowded with information but some obvious structures were visible (roads, rivers, forests, etc.), and the region is not well known. The per- centage of the map covered with large uniform areas such as forests and meadows was an important criterion. All selected maps had a coverage of more than 75% for these two types of land use (48.4% and 36.7%, 73.6% and 14.0%, 50.7% and 25.6%; meadow and forest coverage, respectively, in map 1, map 4, map 2, and map 3). Familiarity with a certain area in fl uences the interpretation process and should be avoided. The participants all live in the northern part of Belgium (Flanders), but the selected maps cover regions located in the southern part. Therefore, it is unlikely that the participants would know the depicted regions by heart. The post-study questionnaire con fi rmed this. The four maps were displayed in the same order to each participant. This fi xed order was necessary to ensure that certain stimuli (map 1 and map 4) would not be depicted right after each other. Figure 2 shows fi ve maps, even though only four were presented to the participants. This is due to a variation introduced with the third stimulus, which was only shown to half of the participants. Six experts and six novices saw map 3 in its normal orientation; the others saw the map mirrored over its vertical central axis. This allows detecting whether the users ’ scanpaths – which result from the interpretation process for this map – would also be mirrored. As can be seen in Figure 2, map 4 is a mirrored version of map 1; this time over the horizontal central axis. Each participant saw both the original map and the mirrored version, separated by two other stimuli (map 2 and map 3a or map 3b). This would provide insights into how familiarity, due to the mirrored map image, in fl uences the map interpretation process. Mirroring of map images (e.g., map 1 vs. map 4 and the two versions of map 3) is done at random. Both map 1 and map 4 were shown to all users so that they may see the in fl uence of (controlled) familiarity which is linked to both bottom-up and top- down processing. The content of map 3 was only depicted once (mainly bottom-up processing), ruling out the familiarity element. In both cases however, we can compare the users ’ eye movements (e.g., scanpaths). Finally, the second topographic map (map 2) is characterized by a deviating use of colors to depict water bodies and village backgrounds. The hue of both original colors (cyan and light yellow) has been changed over 180° into a light orange and purple respectively. When a cartographer wants to improve the design (symbology) of a map, he has to alter something in it (e.g., the color scheme). To map users, this is a deviation to what they are familiar with. It is thus important to know how users react during the interpretation process to such deviations. We chose to adapt the color for the village background and water bodies because these elements are present on all displayed maps. The map with the deviating color was used in the second trial, that is, after all participants (novices and experts) had already seen a map with a “ normal ” color scheme. For those participants who may have been familiar with the color scheme of the 1:10,000 topographic map used in Belgium, deviations from the familiar color scheme could distract or confuse users and thus in fl uence the interpretation process. It is for this reason that participants were asked in the post-study questionnaire to indicate their level of familiarity with Belgian topographic maps drawn at 1:10,000. Its results con fi rmed that most experts used such maps on a regular basis, whereas the novices did not, which could in fl uence their reaction to deviations in the map design (color use). The participants eye movements were recorded using an EyeLink1000 eye tracking device from SR Research (Mississauga, Ontario, Canada) installed at the eye tracking laboratory of the Department of Experimental Psychology at Ghent University. This desk-mounted device with a chin rest can sample a user ’ s POR at a rate of 1000 Hz. The maps were presented on a 21 inch ...
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... participants just had to indicate when they were ready. Hence, they would need to use (retrieve) the stored information again. In order to be able to use this information later on, it has to be stored in (working and long-term) memory in the form of chunks of information (or sche- mata) which are linked to other information stored in the LTM. This requires that the objects are read, recognized, and interpreted (given meaning) (see above). The process of “ remembering the map – drawing the map ” was repeated four times. After the completion of the fourth trial, participants were asked to fi ll out a questionnaire. This post-study questionnaire was used to obtain personal characteristics (expertise, age, gender, etc.) to verify their familiarity with the presented regions, and to receive feedback. In this paper, we did not test users ’ memory perfor- mance; this was done in Ooms et al. (forthcoming). We were interested in fi nding out where (and how) they looked at stimuli (or maps), namely how information is retrieved, how is it structured, and how much is retrieved. Thinking aloud, sketch maps and a questionnaire were used to study the information retrieval process. These fi ndings con fi rm that the participants would have had interpreted the information on the maps. Four maps from the Belgian 1:10,000 topographic map series were displayed on screen during the user study. The selected maps were not crowded with information but some obvious structures were visible (roads, rivers, forests, etc.), and the region is not well known. The per- centage of the map covered with large uniform areas such as forests and meadows was an important criterion. All selected maps had a coverage of more than 75% for these two types of land use (48.4% and 36.7%, 73.6% and 14.0%, 50.7% and 25.6%; meadow and forest coverage, respectively, in map 1, map 4, map 2, and map 3). Familiarity with a certain area in fl uences the interpretation process and should be avoided. The participants all live in the northern part of Belgium (Flanders), but the selected maps cover regions located in the southern part. Therefore, it is unlikely that the participants would know the depicted regions by heart. The post-study questionnaire con fi rmed this. The four maps were displayed in the same order to each participant. This fi xed order was necessary to ensure that certain stimuli (map 1 and map 4) would not be depicted right after each other. Figure 2 shows fi ve maps, even though only four were presented to the participants. This is due to a variation introduced with the third stimulus, which was only shown to half of the participants. Six experts and six novices saw map 3 in its normal orientation; the others saw the map mirrored over its vertical central axis. This allows detecting whether the users ’ scanpaths – which result from the interpretation process for this map – would also be mirrored. As can be seen in Figure 2, map 4 is a mirrored version of map 1; this time over the horizontal central axis. Each participant saw both the original map and the mirrored version, separated by two other stimuli (map 2 and map 3a or map 3b). This would provide insights into how familiarity, due to the mirrored map image, in fl uences the map interpretation process. Mirroring of map images (e.g., map 1 vs. map 4 and the two versions of map 3) is done at random. Both map 1 and map 4 were shown to all users so that they may see the in fl uence of (controlled) familiarity which is linked to both bottom-up and top- down processing. The content of map 3 was only depicted once (mainly bottom-up processing), ruling out the familiarity element. In both cases however, we can compare the users ’ eye movements (e.g., scanpaths). Finally, the second topographic map (map 2) is characterized by a deviating use of colors to depict water bodies and village backgrounds. The hue of both original colors (cyan and light yellow) has been changed over 180° into a light orange and purple respectively. When a cartographer wants to improve the design (symbology) of a map, he has to alter something in it (e.g., the color scheme). To map users, this is a deviation to what they are familiar with. It is thus important to know how users react during the interpretation process to such deviations. We chose to adapt the color for the village background and water bodies because these elements are present on all displayed maps. The map with the deviating color was used in the second trial, that is, after all participants (novices and experts) had already seen a map with a “ normal ” color scheme. For those participants who may have been familiar with the color scheme of the 1:10,000 topographic map used in Belgium, deviations from the familiar color scheme could distract or confuse users and thus in fl uence the interpretation process. It is for this reason that participants were asked in the post-study questionnaire to indicate their level of familiarity with Belgian topographic maps drawn at 1:10,000. Its results con fi rmed that most experts used such maps on a regular basis, whereas the novices did not, which could in fl uence their reaction to deviations in the map design (color use). The participants eye movements were recorded using an EyeLink1000 eye tracking device from SR Research (Mississauga, Ontario, Canada) installed at the eye tracking laboratory of the Department of Experimental Psychology at Ghent University. This desk-mounted device with a chin rest can sample a user ’ s POR at a rate of 1000 Hz. The maps were presented on a 21 inch ...

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... User experience influences a more effective interpretation of the map, as shown by the research of Ooms et al. (2012Ooms et al. ( , 2014. Users with more experience in the subject matter of the study are better able to process spatial and visual information. ...
... Prior knowledge and habits facilitate the interpretation of complex visual stimuli. The study by Ooms et al. (2012Ooms et al. ( , 2014 was conducted with groups of 31 people (16 experts and 15 novices) and 24 people (12 experts and 12 novices). Indicators such as: faster reaction time, shorter fixation duration, higher number of fixations show the advantage of a more effective interpretation of the map by experienced users. ...
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Even though they are day-to-day activities, humans find navigation and wayfinding to be cognitively challenging. To facilitate their everyday mobility, humans increasingly rely on ubiquitous mobile maps as navigation aids. However, the over-reliance on and habitual use of omnipresent navigation aids deteriorate humans' short-term ability to learn new information about their surroundings and induces a long-term decline in spatial skills. This deterioration in spatial learning is attributed to the fact that these aids capture users' attention and cause them to enter a passive navigation mode. Another factor that limits spatial learning during map-aided navigation is the lack of salient landmark information on mobile maps. Prior research has already demonstrated that wayfinders rely on landmarks—geographic features that stand out from their surroundings—to facilitate navigation and build a spatial representation of the environments they traverse. Landmarks serve as anchor points and help wayfinders to visually match the spatial information depicted on the mobile map with the information collected during the active exploration of the environment. Considering the acknowledged significance of landmarks for human wayfinding due to their visibility and saliency, this thesis investigates an open research question: how to graphically communicate landmarks on mobile map aids to cue wayfinders' allocation of attentional resources to these task-relevant environmental features. From a cartographic design perspective, landmarks can be depicted on mobile map aids on a graphical continuum ranging from abstract 2D text labels to realistic 3D buildings with high visual fidelity. Based on the importance of landmarks for human wayfinding and the rich cartographic body of research concerning their depiction on mobile maps, this thesis investigated how various landmark visualization styles affect the navigation process of two user groups (expert and general wayfinders) in different navigation use contexts (emergency and general navigation tasks). Specifically, I conducted two real-world map-aided navigation studies to assess the influence of various landmark visualization styles on wayfinders' navigation performance, spatial learning, allocation of visual attention, and cognitive load. In Study I, I investigated how depicting landmarks as abstract 2D building footprints or realistic 3D buildings on the mobile map affected expert wayfinders' navigation performance, visual attention, spatial learning, and cognitive load during an emergency navigation task. I asked expert navigators recruited from the Swiss Armed Forces to follow a predefined route using a mobile map depicting landmarks as either abstract 2D building footprints or realistic 3D buildings and to identify the depicted task-relevant landmarks in the environment. I recorded the experts' gaze behavior with a mobile eye-tracer and their cognitive load with EEG during the navigation task, and I captured their incidental spatial learning at the end of the task. The wayfinding experts' exhibited high navigation performance and low cognitive load during the map-aided navigation task regardless of the landmark visualization style. Their gaze behavior revealed that wayfinding experts navigating with realistic 3D landmarks focused more on the visualizations of landmarks on the mobile map than those who navigated with abstract 2D landmarks, while the latter focused more on the depicted route. Furthermore, when the experts focused for longer on the environment and the landmarks, their spatial learning improved regardless of the landmark visualization style. I also found that the spatial learning of experts with self-reported low spatial abilities improved when they navigated with landmarks depicted as realistic 3D buildings. In Study II, I investigated the influence of abstract and realistic 3D landmark visualization styles on wayfinders sampled from the general population. As in Study I, I investigated wayfinders' navigation performance, visual attention, spatial learning, and cognitive load. In contrast to Study I, the participants in Study II were exposed to both landmark visualization styles in a navigation context that mimics everyday navigation. Furthermore, the participants were informed that their spatial knowledge of the environment would be tested after navigation. As in Study I, the wayfinders in Study II exhibited high navigation performance and low cognitive load regardless of the landmark visualization style. Their visual attention revealed that wayfinders with low spatial abilities and wayfinders familiar with the study area fixated on the environment longer when they navigated with realistic 3D landmarks on the mobile map. Spatial learning improved when wayfinders with low spatial abilities were assisted by realistic 3D landmarks. Also, when wayfinders were assisted by realistic 3D landmarks and paid less attention to the map aid, their spatial learning improved. Taken together, the present real-world navigation studies provide ecologically valid results on the influence of various landmark visualization styles on wayfinders. In particular, the studies demonstrate how visualization style modulates wayfinders' visual attention and facilitates spatial learning across various user groups and navigation use contexts. Furthermore, the results of both studies highlight the importance of individual differences in spatial abilities as predictors of spatial learning during map-assisted navigation. Based on these findings, the present work provides design recommendations for future mobile maps that go beyond the traditional concept of "one fits all." Indeed, the studies support the cause for landmark depiction that directs individual wayfinders' visual attention to task-relevant landmarks to further enhance spatial learning. This would be especially helpful for users with low spatial skills. In doing so, future mobile maps could dynamically adapt the visualization style of landmarks according to wayfinders' spatial abilities for cued visual attention, thus meeting individuals' spatial learning needs.
... The time to the first fixation of an area can indicate the saliency of that area (Dong et al., 2018;Goldberg & Kotval, 1999). The total fixation duration is the sum of the duration of all fixations, and the duration of fixation on an area can provide insight into the difficulties of interpreting the information (Ooms et al., 2014). We drew areas of interest (AOIs) for YAH symbols, subway station layout maps, and scene photos for each stimulus ( Figure 6) and calculated the total fixation duration inside different AOIs. ...
... The influence of layout maps might come from map complexity (Liao et al., 2019) and map colors (Brychtova, 2015). The fixation duration ratio of map AOI in scene 5 was significantly higher than that of scene 1-3, which pointed out that participants spent more time interpreting map information (Ooms et al., 2014). But the map of scene 5 had much fewer signs than that of scene 1-3 (Table 1), which indicated that scene 5 did not have an advantage in map complexity. ...
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... For such studies, participants must be grouped based on an initial questionnaire or pre-testing procedures, prior to testing of map interaction using eye-tracking. This is one example of the preferred 'mixed-methods' approach to user testing (Dogusoy-Taylan & Cagiltay, 2014;Keskin et al., 2020;Ooms et al., 2012;Ooms et al., 2014;Ooms et al., 2015). In a related study which concentrated more on differences in stimuli (in this case varying legend design) than on differences in user groups, Çöltekin et al. (2017) identified that participants' prior knowledge of soils and their varying map interpretation abilities led to interesting performance differences between two distinctly differently designed legend types, one based on named categories, the other based on perceptual colour spaces. ...
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This overview paper summarises the ‘state of the art and of the science’ of eye-tracking, and its applications in map use research. Cartographic research is introduced, and its contemporary direction, which indicates that the main areas of such research are now focussed on human beings and their interaction with maps and geospatial displays, is stressed. A brief outline of several different methodologies for map use research is presented: observation, thinking loud, keyboard analysis, eye-tracking, and questionnaires. The role of eye-tracking as a major methodology for use, user, and usability investigation is explored; along with the possible choices for the researcher in the important areas of participant selection, eye-tracking equipment, set-up and use of the testing environment, and analysis of output data. Typical outcomes from eye tracking research are considered, with an assessment of its value in cartographic research in general. Future directions are suggested, along with the need for cartography to promote the valuable work done by researchers using eye-tracking for map use studies to the wider human-computer interaction community, expanding the scope of the geospatial-based stimuli in such experiments beyond maps, making use of the significant expertise and enthusiasm of cartographic researchers.