In this study we investigated the angular resolution subserving the\ud haptic perception of raised line drawings. We found that for acute\ud angles discrimination performance is highly dependent on exploration\ud strategy: mean thresholds of 2.9#14; and 6.0#14; were found for\ud two different exploration strategies. For one of the strategies we\ud found that discriminability is not dependent on the bisect orientation\ud of the angle. Furthermore, we found that thresholds almost\ud double when the angular extent is increased from 20#14; to 135#14;. We\ud also found that local apex information is of significant influence on\ud discrimination for acute as well as obtuse angles. Overall, the results\ud tell us that the acuity with which angles in raised line drawings\ud are perceived is determined by the exploration strategy, local apex\ud information and global angular extent
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