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Encoding differences in visual and haptic face recognition

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons83892

Dopjans,  L
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84298

Wallraven,  C
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons83839

Bülthoff,  HH
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Dopjans, L., Wallraven, C., & Bülthoff, H. (2008). Encoding differences in visual and haptic face recognition. Poster presented at 9th International Multisensory Research Forum (IMRF 2008), Hamburg, Germany.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-C85D-6
Abstract
In previous experiments, we provided further evidence that 3-D face stimuli can be learned and recognized by touch alone. Performance was significantly improved when haptic memory was refreshed during the experiment, indicating high memory demands due to the serial encoding process of haptic exploration. We also found that performance in a complementary visual experiment was better than in the haptic one. We suggested that these results arise from differences in encoding procedures (holistic in vision vs. serial in haptics). To test this hypothesis we designed the following two experiments which promoted serial encoding also in vision: Experiment 1 used the same old/new recognition task for which three faces were learned with three subsequent test-blocks. Participants used a mouse to move a Gaussian window which uncovered 2° of a photograph of the 3-D face. Recognition accuracy was low(d'=.98), equivalent to non-refreshed haptic performance, and significantly lower than for unrestricted visual recognition(d’=2.12). Using the same design in Experiment 2, memory was refreshed by repeated exposure to the learned faces. Performance increased significantly(d'=1.64) to levels of memory-refreshed haptic performance and unrestricted visual recognition. The performance differences in visual and haptic face recognition therefore might be attributed to modality-specific encoding strategies and memory demands.