Spatial Mental Models and Navigation Support Apps for People who are Blind – a Case Study by David Brown, Lindsay Evett, Malcolm Harrison, Allan Ridley & Nick Shopland
Immersive Virtual Reality Simulation Deployment in a Lean Manufacturing Envir...
Spatial Mental Models and Navigation Support Apps for People who are Blind – a Case Study
1. Spatial Mental Models and Navigation
Support Apps for People who are Blind
Lindsay Evett, Malcolm Harrison, Allan Ridley, David Brown
and Nick Shopland
Interactive Systems Research Group (ISRG)
Computing and Technology Team
Nottingham Trent University, UK
ITAG 2012, Nottingham, 24th Oct 2012 1
2. Independent Travel
• People who are blind generally use sequential, route-
based strategies
• Dependent on sighted guides to learn new routes in a
sequential way (using cane, guide dogs)
• Quite a few systems support navigation outside
(e.g., Trekker, smart phone apps; some indoors –
e.g., see Battersby, this session)
• Some systems focus on obstacle avoidance, replacing
sight, often have intrusive audio feed back
• Better to complement existing methods (dog and
cane), focus on goal (getting safely from A to B) and
skills, in an effective and usable manner
ITAG 2012, Nottingham, 24th Oct 2012 2
5. Egocentric vs. Exocentric/Allocentric
• Egocentric, sequential routes hard to learn (Martinsen
et al, 2007)
• Body (egocentric), rather than external
(exocentric/allocentric), frame of reference
• Those with more map based, exocentric, frames of
reference perform better in navigational tasks
(Simonnet et al, 2006)
• Map based navigation better than GPS route-based
(Ishikawa, et al, 2008)
• “Cognitive maps” – enhance confidence, flexibility
ITAG 2012, Nottingham, 24th Oct 2012 5
6. Cognitive Maps
• External frames of reference and map based strategies
more efficient and flexible – easier to remember, can
take alternative routes, shortcuts, change destinations –
they offer a more complete spatial representation
(Martinsen et al, 2007)
• Active exploration of accessible maps to support
development of map-based strategies and spatial mental
models (Tversky, 1993) to facilitate independent
navigational skills (Cognitive Collages)
• Can use at leisure (unlike real world support)
ITAG 2012, Nottingham, 24th Oct 2012 6
7. Spatial Mental Models
• Tversky (1993)
– Mental representations of knowledge of environment
not simply representations of maps (include memory
of journeys, maps, directions, landmarks etc)
– Disparate pieces of knowledge about environments –
cognitive collages rather than single, coherent map;
evidenced by errors of memory and descriptions
– For well-known environments, representations of
spatial layout quite accurate, allowing perspective
taking, re-orientation, spatial inference – Spatial
Mental Models; not metric but preserve coarse
spatial relations and includes reference points
ITAG 2012, Nottingham, 24th Oct 2012 7
8. GPS vs Maps and Direct experience
Ishikawa et al (2008) compared mobile GPS to
paper maps and direct experience for walking
routes:
– GPS users travelled longer distances, made more stops
than the others
– GPS users travelled more slowly, made larger direction
errors, drew poorer maps, found wayfinding more
difficult than direct experience
– Reasons? GPS maps small (how much surrounding
area needed?); GPS has local focus; less experience
with GPS
ITAG 2012, Nottingham, 24th Oct 2012 8
9. Spatial vs Route Information
Others have pointed out the importance of
spatial, rather than just route, information:
– Showing users their exact location relative to where they
need to get to can help people who struggle with spatial
skills
– Oliver and Burnett – route guidance systems suppress
cognitive map development
– Lindstrom – necessary for people with disabilities to
assimilate a mental map, and should be built in a mobile
environment
– Lindstrom – users with disabilities stress the importance of
being located should they no longer be able to orientate
themselves
ITAG 2012, Nottingham, 24th Oct 2012 9
10. Questions
• Many navigational apps; how useful are they?
• Find out about environment, benefits?
• Find out about environment where known
routes, benefits?
• Find out about environment, extend route, new
route, benefits?
• Apps offer similar apparent (?) support but
differences in scale, detail, availability of global
information, accessibility
ITAG 2012, Nottingham, 24th Oct 2012 10
15. Evaluate Spatial Mental Models
Does the solution make spatial relationships available, allow multiple
perspectives, sufficient for actual route finding? Possible tasks:
1. Recreate map – verbal description or model
2. Describe routes from A to B and from C to B (taking different
perspectives)
3. Real tasks in areas of a known route:
• demonstrate ability to deal with obstacles
• extend known route
• demonstrate ability to orient with respect to reference points
• create new route
ITAG 2012, Nottingham, 24th Oct 2012 15
16. Can Apps Support Independent Travel
for People who are Blind?
• New address, no routes, no chance of trainers
• (Learnt route to get there through Google
maps, Google street view, Trekker)
• Use range of apps, with global and local
information to support and supplement
• Extend route(s), new routes?
• Development of cognitive map? Is having a
cognitive map better than routes alone?
ITAG 2012, Nottingham, 24th Oct 2012 16
17. Three New Routes!!
• Explored street map of new area with TouchOver
Map, for as long as wanted, and to find 3 targets –
about 40 minutes
• Active, independent exploration
• From start point, point to targets and describe how to
get there
• Find those targets in the real world
• Yes!!
• NavPoint useful but tricky
• Other apps not much help – WalkyTalky aims to do
what Trekker does but didn’t work; new iPhone does
ITAG 2012, Nottingham, 24th Oct 2012 17
18. Further Evaluation
• Spatial mental models:
– Point to other locations?
– Landmarks?
• Is SMM memorable, can it be communicated?
• Larger group – can others do it?
– Compare with and without traditional training
NB needs accessible set up, including search, size
(s, m, l) and store
ITAG 2012, Nottingham, 24th Oct 2012 18
19. Location Based Services for People
with Disabilities (this session)
• Location-based services, route learning and
navigational support for wide range of
disabilities
• Travel skills and confidence to learn new
routes are core skills for leading independent
lives
• Showing users their exact location relative to
where they need to get to, and significant
points, can help people who struggle with
spatial skills
• Games-based learning
• Incorporate haptic map?
ITAG 2012, Nottingham, 24th Oct 2012 19
20. Additional issues
• Safety – can’t just wave a phone about
• Moving it around could change responses
(NavPoint)
• Shoulder speaker/wizzy earphones
• Phone calls!
• Map accessibility in iOS 6; Walkit.com
ITAG 2012, Nottingham, 24th Oct 2012 20
21. Conclusions
• User Centred Design, designing AT using technology
that doesn’t mark out people as ‘other’, cheap, easily
available, mainstream – address abandonment of AT
• Haptic map supports/facilitates creation of Spatial
Mental Models to support independent
travel, independence for people who are blind
• Haptic maps – outdoors (and indoors)
• Location Based Services, navigation support –
incorporate haptic maps (outdoors) Lewis et al, 2012
• Virtual Cane – indoors (outdoors?) Battersby, 2012
ITAG 2012, Nottingham, 24th Oct 2012 21
22. Contact Details
Dr Lindsay Evett,
Prof. David J. Brown and the
Interactive Systems Research Group
Computing and Technology Team
NTU, UK
Tel: +44 115 848 8359
lindsay.evett@ntu.ac.uk
Tel: +44 115 848 8350
david.brown@ntu.ac.uk
ITAG 2012, Nottingham, 24th Oct 2012 22
24. Sources
Battersby S J (2012), The mobile virtual cane, ITAG12, Nottingham UK
Brown DJ, Standen PJ, Evett L, Battersby S and Shopland N. (2010). Designing Serious Games for
People with Dual Diagnosis: Learning Disabilities and Sensory Impairments. In Educational
Gaming. Chapter in Zemliansky, P and Wilcox, D. M., (eds), Educational Gaming, IGI Global
Brown, D. J., Evett, L. J., Ridley, A., Shopland, N., Merritt, P., Harrison, M. and Van Isacker, K.
(2011) Evaluation of Haptic RIA Maps and other navigational support systems for people who are
blind, paper presented to 2nd International AEGIS Conference, Brussels, Belgium, November
2011, pp 334-341, http://www.epr.eu/aegis/wp-content/uploads/2011/12/AEGIS_Conference_proceedings-final.pdf
accessed 9/1/12
Frankenstein, J, Mohler, B, Bulthof, H H, and Meilinger, T (2011) Is the map in our head oriented
North? Psychological Science, 23, 2: pp. 120-125
HaptiMaps (2011). HaptiMap, Haptic, Audio and Visual Interfaces for Maps and Location Based
Services, http://www.haptimap.org/ accessed 23/11/11
Hill E W, J. J. Rieser, M. Hill, J. Halpin, R. Halpin (1993). How persons with visual impairments
explore novel spaces: strategies of good and poor performers, J. Vis. Imp. and
Blindness, 87, 8, pp. 295-301.
Humanware (2012) Trekker Breeze, http://www.humanware.com/en-
united_kingdom/products/blindness/talking_gps/trekker_breeze accessed 22/10/12
Ishikawa, T., Fujiwara, H., Imai, O., and Okabe, A. (2008) Wayfinding with a GPS-based mobile
navigation system: A comparison with maps and direct experience, Journal of Environmental
Psychology, 28, 74-82
ITAG 2012, Nottingham, 24th Oct 2012 24
25. Sources (contd.)
Lewis, J., Popescu, C., Standen, P., and Saridaki, M. (2012) Evaluation of route learning software
on Android for people with disabilities, ITAG12, Nottingham, UK
Lindstrom, J-I. (2006) New technologies to help people with disabilities and elderly people, in
Roe, P. R. W. (ed) Towards and Inclusive Future: Impact and Wider potential of Information and
Communication Technologies, COST219ter, funded by the EU RTD Framework
Programme, http://www.snapi.org.uk/cost219ter/inclusive_future/index.htm accessed 22/10/12
Martinsen, H., J. M. Tellevik, B. Elmerskog, M. Storlilokken (2007). Mental effort in mobility route
learning, Journal of Visual Impairment and Blindness, 101, pp1-18.
Oliver, K. J., G. E. Burnett, (2008). Learning-oriented vehicle navigation systems: a preliminary
investigation in a driving simulator. In Proceedings of the 10th International Conference on
Human–Computer Interaction with Mobile Devices and Services. pp. 119–126.
Poppinga, B., Pielot, M., Magnusson, C., and Rassmus-Grohn, K. (2011) TouchOver Map: Audio-
tectile exploration of interactive maps, MobileHCI 2011, Stockholm, Sweden, ACM
Simonnet M, J-Y. Guinard J. Tisseau (2006) Preliminary work for vocal and haptic navigation
software for blind sailors, Proc. 6th Intl Conf. Disability, Virtual Reality & Assoc. Tech.
(ICDVRAT), Esbjerg, Denmark, 2006, pp. 255-262.
Tversky, B. (1993). Cognitive maps, cognitive collages and spatial mental models, in Frank, A U
and Campari, I (Eds.) Spatial Information Theory: A Theoretical Basis for GIS, Proceedings COSIT
‘93, Lecture Notes in Computer Science, 716, pp. 14-24, Springer, Berlin.
ITAG 2012, Nottingham, 24th Oct 2012 25
Hinweis der Redaktion
External frames of reference and map based strategies are more efficient and flexible – easier to remember, alternative routes can be taken, shortcuts made and destinations changed because they encompass a more complete spatial representation (Martinsen et al, 2007)Mental models are a vital part of advanced O&M skills, knowing where you are at all times is essential and without these skills it would be impossible to attempt to navigate unknown outdoor spaces (creates prior knowledge, confidence, back up plan if real time technology goes down…)Active exploration of virtual worlds and accessible maps to support development of map-based strategies and spatial mental models (Tversky, 1993) to facilitate independent navigational skills (Cognitive Collages): Discusses issue of how people represent maps and outside spaces. They don’t have a copy of map in their head, what they do have is cognitive collages and spatial mental models. Cognitive collages are sort of areas you know, but don’t know they in between bits. Spatial mental models are really about what the representation is like – so you have landmarks which are of significance to you – like a big tower or your mates house and they always seem closer than they actually are. When describing where something is you would say where they are in relation to such landmarks – always described in relative terms. Give people the targets that mean something to them.Can use at leisure (unlike real world support): first person, regular practice in a safe environment.Map-based better than GPS routes (Ishikawa et al, 2008): This study examined the effectiveness of a Global Positioning System (GPS)-based mobile navigation system in comparison to paper maps and direct experience of routes, by focusing on the user’s wayfindingbehavior and acquired spatial knowledge. Based on information received from one of these three media, participants walked six routes finding the way to goals. Results showed that GPS users traveled longer distances and made more stops during the walk than map users and direct-experience participants. Also, GPS users traveled more slowly, made larger direction errors, drew sketch maps with poorer topological accuracy, and rated wayfinding tasks as more difficult than direct-experience participants. Characteristics of navigation with these three learning media and possible reasons for the ineffectiveness of the GPS-based navigation system are discussed.
Find out about environment, benefits? Can just find out what’s out there – there are some benefits to this – familiarity…Find out about environment where known routes, benefits? Find out about area around known route, could help you deal with obstacles…..Find out about environment, extend route, new route, benefits?: As above with a fuller spatial mental model your ability to extend and find new routes and to navigate independently and with confidence increases. Similar questions for Haptic Maps, HaptiMaps (Ross, 2007; Bilbao et al, 2011; Brown et al, 2011) –similar questions to what we posed for Haptic Maps and Hapti Maps.Similar support but difference in scale and detail: for the cane we deal with indoor spaces, in AEGIS and associated prototypes we have outdoor spaces, some supported by GPS
The Virtual Cane (VC) designed for, but not restricted to, indoors; outdoors can use GPS and map-based apps:VC models indoor spaces and buildings (but could model outdoor spaces especially built up areas; for outdoor spaces there are a whole range of apps which use maps and GPS.There are a number of such apps which are accessible: As we move to third generation accessible solutions (e.g., AEGIS project) there is a drive to develop accessible map based apps to develop navigational skills and spatial mental models for people who are blind. As part of AEGIS we conducted usability evaluations of Haptic RIA Maps, TouchOver Map and NavPoint (HaptiMap project):Haptic RIA - partially sighted/blind users explore web-based street map using a force feedback/haptic device; TouchOver Map – Tablet and mobile based, Touch-based; user actions have a direct, reliable, relationship with maps; The PointNavHaptiMap prototype application allows scanning an area for points of interest, selecting one of them, finding out more about this point and being guided to it.RECALL and VC projects based on proposal that cognitive maps (Global Reference Frames, see Frankenstein et al, 2011) and spatial strategies more effective for independent travel that route guidance (Hill et al, 1993): because the encompass a much fuller representation of the route to be taken. They allow shortcuts to be made, alternative routes to be taken and even end points to be changed. Route guidance suppresses cognitive map development. What happens if technology fails, in scenario 1 you can use your cognitive map, in scenario 2 you are pretty stuck. AEGIS and HaptiMap prototypes, and other apps, support navigation; AEGIS and HaptiMap apps support Cognitive maps: these projects develop apps to develop navigational skills and cognitive maps and not route guidance.
HaptiMap demonstrator (HaptiMap, 2011)Has all the desirable attributes: user actions have a direct, reliable, relationship with maps - affordance Simple reference points (may need more on tablet) easy to use (2 blind users) can reproduce the map (2 blind users) BUT 1 blind user with resid. vision found areas with patchy feedback, frustrating and poor info.MS haptic mouse could have similar attributesTo have both would give desktop and mobile apps
Does model contain spatial relationships, allow multiple perspectives, sufficient for actual route finding? Possible tasks:Recreate map – can the provide a verbal description of the real worldDescribe routes from A to B and from C to B (or Orly tasks – find object and take to another posn. and reverse; point to direction of key landmarks and reverse; take to a new position and describe route to original postion)Study area where known route:demonstrate ability to deal with obstaclesextend known routecreate new route