A User Study to Evaluate Tactile Charts with Blind and Visually Impaired People

Engel, Christin; Weber, Gerhard

doi:10.1007/978-3-319-94274-2_24

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…Braille labels are usually accompanied to convey precise values and textual elements such as legends. A study demonstrated that a tactile scatter plot enables faster reading of a correlation pattern compared to a braille-based table and speechbased table [WM18], although different chart types can lead to different user experiences and preferences [EW18,EW17a]. The haptic modality is absent of a tactile graphic's physicality but uses force feedback to interact with a virtual graphic.…”

Section: Sensory Modalitymentioning

confidence: 99%

“…However, similar to sonification, the information resolution of haptic feedback and tactile graphics is low, and thus they may not be suitable for conveying accurate data values [HMG19]. The number of textures and the density of guidelines should be carefully controlled for better discriminability; they may be better removed if dispensible [EW18]. Braille labels in addition to graphics, can help the reading of precise values [EW17b].…”

Section: A Preliminary Model For Visualization Accessibilitymentioning

confidence: 99%

“…Tactile perception mainly utilizes tactile graphics such as embossed prints and physical visualization (19/56), haptic feedback such as forced vibrations (15/56), and braille for texts (7/56). For many visually impaired users, perceiving information through touch is common, particularly in an educational context [EW17b], and its spatiality allows simultaneous and on-demand exploration of data trends in contrast to linear audio [EW18]. However, it requires motor movement and lacks the bandwidth to support the preattentive processing of multiple elements in a visualization.…”

Section: Sensory Modalitymentioning

confidence: 99%

See 2 more Smart Citations

Accessible Visualization: Design Space, Opportunities, and Challenges

Kim

Joyner

Riegelhuth

et al. 2021

Computer Graphics Forum

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Visualizations are now widely used across disciplines to understand and communicate data. The benefit of visualizations lies in leveraging our natural visual perception. However, the sole dependency on vision can produce unintended discrimination against people with visual impairments. While the visualization field has seen enormous growth in recent years, supporting people with disabilities is much less explored. In this work, we examine approaches to support this marginalized user group, focusing on visual disabilities. We collected and analyzed papers published for the last 20 years on visualization accessibility. We mapped a design space for accessible visualization that includes seven dimensions: user group, literacy task, chart type, interaction, information granularity, sensory modality, assistive technology. We described the current knowledge gap in light of the latest advances in visualization and presented a preliminary accessibility model by synthesizing findings from existing research. Finally, we reflected on the dimensions and discussed opportunities and challenges for future research.

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Section: Sensory Modalitymentioning

confidence: 99%

Section: A Preliminary Model For Visualization Accessibilitymentioning

confidence: 99%

Section: Sensory Modalitymentioning

confidence: 99%

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Accessible Visualization: Design Space, Opportunities, and Challenges

Kim

Joyner

Riegelhuth

et al. 2021

Computer Graphics Forum

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“…Data sonification has been used on various visualizations such as line graphs, bar graphs, and maps [90,24,42]. Tactile visualizations realized via haptic feedback, braille display, or embossed prints are another popular approach to enhance accessibility for people with visual impairments [83,27,30,28,29,61,89,33,43,26]. Yet, the low-resolution nature of tactile visualizations limits their use for more complex visualizations [29].…”

Section: Visualization Accessibility For Visually Impaired Peoplementioning

confidence: 99%

Communicating Visualizations without Visuals: Investigation of Visualization Alternative Text for People with Visual Impairments

Jung¹,

Mehta²,

Kulkarni³

et al. 2021

Preprint

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Alternative text is critical in communicating graphics to people who are blind or have low vision. Especially for graphics that contain rich information, such as visualizations, poorly written or an absence of alternative texts can worsen the information access inequality for people with visual impairments. In this work, we consolidate existing guidelines and survey current practices to inspect to what extent current practices and recommendations are aligned. Then, to gain more insight into what people want in visualization alternative texts, we interviewed 22 people with visual impairments regarding their experience with visualizations and their information needs in alternative texts. The study findings suggest that participants actively try to construct an image of visualizations in their head while listening to alternative texts and wish to carry out visualization tasks (e.g., retrieve specific values) as sighted viewers would.The study also provides ample support for the need to reference the underlying data instead of visual elements to reduce users' cognitive burden. Informed by the study, we provide a set of recommendations to compose an informative alternative text.

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“…An early study [2] compared different formats for tactile line charts. Another study [13] evaluated different tactile formats for bar charts, line charts, pie charts and scatter plots. To the best of our knowledge, there has been no research evaluating the effectiveness of different tactile representations of networks.…”

Section: Tactile Graphicsmentioning

confidence: 99%

Tactile Presentation of Network Data: Text, Matrix or Diagram?

Yang

Marriott

Butler

et al. 2020

Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems

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Visualisations are commonly used to understand social, biological and other kinds of networks. Currently we do not know how to effectively present network data to people who are blind or have low-vision (BLV). We ran a controlled study with 8 BLV participants comparing four tactile representations: organic node-link diagram, grid node-link diagram, adjacency matrix and braille list. We found that the node-link representations were preferred and more effective for path following and cluster identification while the matrix and list were better for adjacency tasks. This is broadly in line with findings for the corresponding visual representations.

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A User Study to Evaluate Tactile Charts with Blind and Visually Impaired People

Cited by 17 publications

References 7 publications

Accessible Visualization: Design Space, Opportunities, and Challenges

Accessible Visualization: Design Space, Opportunities, and Challenges

Communicating Visualizations without Visuals: Investigation of Visualization Alternative Text for People with Visual Impairments

Tactile Presentation of Network Data: Text, Matrix or Diagram?

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