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Lisa Dopjans

 

Picture of Dopjans, Lisa

Lisa Dopjans

Position: PhD Student  Unit: Alumni Bülthoff

Multisensory investigation on acquiring expertise in face recognition

 

Introduction

Faces are often considered to be different from other object categories both because of the sociobiological necessity for humans to differentiate members of their own group, and because of the differences in cognitive demands for face perception relative to general object recognition. A tremendous amount of research has shown that human observers are experts at visual face recognition due to specialized visual mechanisms for face processing that evolve with perceptual expertise. In this work, we introduce haptic and gaze-restricted, visual face processing as tools for studying the mechanisms underlying face processing expertise.

 

Goals

The goals of this research are threefold: to test cross-modal transfer of face recognition in vision and haptics; to investigate serial encoding of face information in vision and haptics, and to examine effects of expertise in serial encoding.

 

Methods

A dataset of faces from the MPI face database was used to produce 3D printout, which could be explored visually or haptically [1,2]. We used a novel gaze-restricted display for promoting serial encoding in vision, in which participants could explore the face through a mouse-controlled small aperture of 2 degrees of visual angle. Face recognition was tested with a standard old-new paradigm. A group of participants was trained for several days using gaze-restricted exploration to investigate changes in processing strategies over time.

 

Results

We showed that the haptic modality has the capacity to learn and recognize faces, and that face-relevant information can be shared across sensory modalities [1]. Using gaze-restricted visual exploration, we also found that face recognition was disrupted to levels of haptic recognition, with a clear switch from configural to featural processing. Finally, results from training experiments on gaze-restricted exploration demonstrated that practice with serial encoding can lead to some of the recognition effects typically associated with unrestricted visual face recognition, such as face inversion effects [2].

 

Conclusion

Overall our work highlights how modality-specific differences in information acquisition affect processing strategies in face recognition, and under which conditions those differences can be compensated for by perceptual expertise. The results show that face recognition strategies can be acquired easily in untrained modalities and through novel means of exploration.

 

References

1.      Dopjans L, Wallraven C and Bülthoff HH (2009) Cross-Modal Transfer in Visual and Haptic Face Recognition, IEEE Transactions on Haptics (4) 236-240.

2.      Dopjans L, Bülthoff HH, Wallraven C (2011) Serial exploration of faces: Comparing vision and touch, Under revision.

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Articles (4):

Wallraven C Person, Whittingstall L Person and Bülthoff HH Person (May-2013) Learning to recognize face shapes through serial exploration Experimental Brain Research 226(4) 513-523.
Wallraven C Person and Dopjans L Person (March-2013) Visual experience is necessary for efficient haptic face recognition NeuroReport 24(5) 254–258.
Dopjans L Person, Bülthoff HH Person and Wallraven C Person (January-2012) Serial exploration of faces: Comparing vision and touch Journal of Vision 12(1:6) 1-14.
Dopjans L Person, Wallraven C Person and Bülthoff HH Person (October-2009) Cross-Modal Transfer in Visual and Haptic Face Recognition IEEE Transactions on Haptics 200(4) 236-240.

Posters (7):

Dopjans L Person, Wallraven C Person and Bülthoff HH Person (August-2009): Re-learning face recognition: evidence for efficient strategies without holistic processing, 32nd European Conference on Visual Perception, Regensburg, Germany, Perception, 38(ECVP Abstract Supplement) 100.
Dopjans L Person, Wallraven C Person and Bülthoff HH Person (July-2009): Visual experience supports haptic face recognition: Evidence from the early- and late-blind, 10th International Multisensory Research Forum (IMRF 2009), New York, NY, USA.
Dopjans L Person, Wallraven C Person and Bülthoff HH Person (August-2008): A visual but no haptic face inversion effect indicates modality-specific processing differences, 31st European Conference on Visual Perception, Utrecht, Netherlands, Perception, 37(ECVP Abstract Supplement) 5.
Schultz J Person and Dopjans L Person (August-2008): Perception of animacy from a single moving object, 31st European Conference on Visual Perception, Utrecht, Netherlands, Perception, 37(ECVP Abstract Supplement) 154.
pdf
Dopjans L Person, Wallraven C Person and Bülthoff HH Person (July-2008): Encoding differences in visual and haptic face recognition, 9th International Multisensory Research Forum (IMRF 2008), Hamburg, Germany.
Dopjans L Person, Wallraven C Person and Bülthoff HH Person (August-2007): Crossmodal transfer in face recognition: from haptics to vision, 30th European Conference on Visual Perception, Arezzo, Italy, Perception, 36(ECVP Abstract Supplement) 207.
Dopjans L Person, Wallraven C Person and Bülthoff HH Person (July-2007): Cross modal transfer in face recognition, 10th Tübinger Wahrnehmungskonferenz (TWK 2007), Tübingen, Germany.

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Last updated: Friday, 17.01.2014