Dr. Tobias Meilinger |
| Address: | Spemannstr. 44 72076 Tübingen |
| Room number: | 1.VR.02 |
| Fax: | +49 7071 601 616 |
| E-Mail: | tobias.meilinger |
I am interested in how we navigate through everyday environments: how we represent, combine and use experienced views, movement trajectories, maps, and descriptions. My approach uses behavioural experiments in real and virtual environments supplemented by formal description methods of space, functional neuroimaging and cognitive modeling.
Survey knowledge for environmental spaces
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How do we represent cities or buildings - by multiple local reference frames as we experienced them or by a single global reference frame, a “cognitive map”? The survey task of pointing to distant locations within ones city of residence relies on a single, north oriented reference frame – probably acquired from a map. However, if the knowledge was acquired from navigation pointing is based rather on multiple local reference frames (e.g., corresponding to a street or a room). In the further course of the project we examine the following questions: How do humans integrate the multiple views experienced during navigation within one single reference frame? How is information from navigation, maps, and building structure combined? What is the neural basis for these processes? |
Publications:
- Frankenstein, J., Mohler, B.J., Bülthoff, H.H. & Meilinger, T. (in press). Is the Map in Our Head Oriented North? Psychological Science.
- Meilinger, T., Wiener, J.M., & Berthoz, A. (2011). The integration of spatial information across different perspectives. Memory & Cognition, 39, 1042-1054.
- Meilinger, T. & Bülthoff, H.H. (2010). The Direction Bias and the Incremental Construction of Survey Knowledge. 32nd Annual Conference of the Cognitive Science Society.
Cooperation partners:
J. Wiener, A. Berthoz, J. Frankenstein, B.E. Riecke, B.J. Mohler, T. Wolbers, R. Conroy Dalton, C. Hölscher, S. Büchner, H.A. Mallot, H.H. Bülthoff
Funding:
- DFG project “Where is my goal? The functional, computational and neural basis of human survey knowledge” (principal investigator: T. Meilinger)
- Max Planck Society
- EU project “Wayfinding”
Language and sensorimotor codes for route memory
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How do we represent routes? Our results indicate that route knowledge acquired from navigation and from maps is not only encoded spatially, but also in a verbal code, e.g. as route directions. The usefulness of verbal encoding, however, seems to depend on already established long-term associations between corresponding verbal and spatial elements, e.g., the label "T-intersection" and a spatial representation of a T-intersection |
Publications:
- Meilinger, T., Knauff, M., & Bülthoff, H. H. (2008). Working memory in wayfinding - a dual task experiment in a virtual city. Cognitive Science, 32, 755-770.
Cooperation partners:
H.A. Mallot, M. Knauff, G. Hardiess, H.H. Bülthoff
Funding:
- DFG project “Mapspace” (SFB/TR8 Spatial Cognition)
- EU project “Wayfinding”
- Max Planck Society
Theoretical foundations of spatial cognition
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This research is concerned with conceptions of how space can be represented and processed theoretically and in the light of current empirical data. We argue that simple egocentric and allocentric conceptions are not sufficient to capture complex situations and suggest combining them into complex representations. I also propose a theory for self-localisation, route- and survey navigation in environmental spaces. This work is meant to provide a larger overview of the area of spatial cognition, contrast it with non-spatial domains, and serve future experimentation. |
Publications:
- Vosgerau, G. Knoll, A., Meilinger, T. & Vogeley, K. (in press). Representation. In A. Stephan & S. Walter (Eds.), Handbuch Kognitionswissenschaft. Stuttgart: Metzler
- Meilinger, T. & Vosgerau, G. (2010) Putting Egocentric and Allocentric into Perspective. In C. Hölscher, C., T. F. Shipley, M. Olivetti Belardinelli, J. A. Bateman, N. S. Newcombe (Eds.), Spatial Cognition VII, LNAI 6222 (pp. 207-211). Berlin: Springer.
Cooperation partners:
Funding:
- Max Planck Society
- DFG project “Where is my goal? The functional, computational and neural basis of human survey knowledge” (principal investigator: T. Meilinger)
Strategies and aids for wayfinding in complex buildings
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The way we navigate towards a location in a complex building depends on various factors. Visitors highly familiar with a building directly approach a goal region first, while unfamiliar navigators more often stick to highly visible or already known routes. Both groups adjust their strategies towards task requirements. In novel buildings navigators profit more from signs and qualitative route maps than from precise floor plans and cross sections. Combining signs and maps further improves performance. While wayfinding-aids ease navigation, they seem to slow down the acquisition of building knowledge. |
Publications
- Hölscher, C., Büchner, S. J., Meilinger, T., & Strube, G. (in press). Adaptivity of wayfinding strategies in a multi-building ensemble - the effects of spatial structure, task requirements and metric information. Journal of Environmental Psychology.
- Meilinger, T., Hölscher, C., Büchner, S. J., & Brösamle, M. (2006). How Much Information Do You Need? Schematic Maps in Wayfinding and Self Localisation. International Conference Spatial Cognition 2006 (pp. 381–400).
- Hölscher, C., Meilinger, T., Vrachliotis, G., Brösamle, M., & Knauff, M. (2006). Up the down staircase: next term Wayfinding strategies in multi-level buildings. Journal of Environmental Psychology, 26, 284–299.
Cooperation partners:
C. Hölscher, S. Büchner, M. Brösamle, G. Strube
Funding:
- DFG project “Mapspace” (SFB/TR8 Spatial Cognition)
- DFG project “SpaceGuide” (SFB/TR8 Spatial Cognition)
- Max Planck Society
The geometric structure of environmental spaces
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Several studies indicate that the geometric layout of a visible surrounding is processed somewhat differently compared to feature or landmark information. I am interested in whether this also extends to environmental spaces such as cities or buildings. Our first results show that the geometric layout of intersections as described by isovist parameters is reflected in route memory and wayfinding performance. In the further course of this project we want to examine what exactly is represented of a layout and how these representations relate to each other. |
Publications
Cooperation partners:
G. Franz, R. Conroy Dalton, H.H. Bülthoff
Funding:
- Max Planck Society
- DFG project “Mapspace” (SFB/TR8 Spatial Cognition)
Situational adaptation of spatial memory
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Long-term-memories of local environments and maps are oriented. Do we adjust these orientations spontaneously during everyday navigation – even this is not required for solving a tasks? Our results suggest that the answer is yes. During route planning we seem to change the encoded orientation of a local environment towards the orientation of the route crossing this location. This might ease the recognition of such a location during subsequent navigation. Maps of a nearby, but not visible city area are drawn from the perspective the drawer has on this area. Although the underlying knowledge likely was acquired from north-oriented maps, it was adjusted towards the current location of the navigator. |
Cooperation partners:
J.-P. Bresciani, K. Basten, J. Frankenstein, H.A. Mallot
Funding:
- Max Planck Society
- University of Tübingen
Further research
Additional research interests which are currently developed encompass 3D updating (together with M. Barnett-Cowan and M. Vidal), spatial priming (together with J. Wiener) and new measurement tools for spatial ability (together with A. Postma and I. van der Ham). I am also cooperating with the project SpaceGuide at the University of Freiburg (principal investigators: C. Hölscher, G. Strube and W. Burgard) and the feelSpace project at the University of Osnabrück (principal investigator: P. König). In former projects at the University of Würzburg I examined the influence of passengers on accidental risk (together with M. Vollrath and H.-P. Krüger), the influence of roadside vegetation on traffic safety, and the usability of menu systems (together with I. Totzke and H.-P. Krüger).
Integrating spatial information about cities and buildings
Tobias Meilinger & Heinrich H. Bülthoff
Introduction & Goals
Navigators have to move around and integrate information from different views in order to perceive environmental spaces, i.e. cities or buildings. Alternatively, spatial relations are learned from a map. We examine how environmental spaces are memorized, how acquired pieces of information are combined, and identify corresponding brain processes.
Methods
We conduct experiments in virtual environments e.g., learned by walking on an omni-directional treadmill ([3] see Figure 1) or in daily life [1] and record brain activity with fMRI [4]. Participants are teleported to previously encountered locations in the environment and point to other distant locations within this environment. Pointing requires integrating multiple pieces of information. By comparing pointing or navigating in different body orientations we can identify reference frame orientation of the underlying neural and mental representations [1, 2, 4]. Order effects indicate directional asymmetries in memory and give hints about the underlying integration processes [2, 3, 5].
Results
Pointing to locations within ones city of residence relies on a single north-oriented reference frame likely learned from maps [1]. Without maps available navigators primarily memorize a novel space as local interconnected reference frames corresponding to a corridor or street [3, 5]. Consistent with these results, entorhinal grid cells in humans quickly remap their grid orientation after changing the surrounding environment [4]. Participants do not automatically integrate spatial information during learning, but preferably do so when retrieving spatial memory to solve a task [5] within the reference frame this task is conducted [2].
Conclusions and Outlook
Spatial knowledge acquired by navigation is usually memorized within multiple local units. Most navigators integrate these units not until required to do to so within an incremental process. We are currently testing whether this integration process is continuous as when mentally travelling along a route or this process is piecewise as when adding pieces to a mental model of the environment one after the other. With multiple sources of information available navigators flexibly combine navigation-based and map-based knowledge.
Figure 1: An aerial snapshot of a virtual city (left) participants explored by walking on the omnidirectional treadmill (right). The egocentric view is displayed on a head mounted display and for illustration also on the screen in the back.
References