Abstract
This paper describes an experiment conducted to measure haptic sensitivity and the effects of haptic training with and without visual aid. The protocol for haptic training consisted of a needle insertion task using dual-layer silicon samples. A visual aid was provided as a multimodal cue for the haptic perception task. Results showed that for a group of novices (subjects with no previous experience in needle insertion), training with a visual aid resulted in a longer time to task completion, and a greater applied force, during post-training tests. This suggests that haptic perception is easily overshadowed, and may be completely replaced, by visual feedback. Therefore, haptic skills must be trained differently from visuomotor skills.
Highlights
In several medical procedures clinicians depend on their haptic perception abilities to insert needles in the patient; for example, in the administration of drugs and in radiological percutaneous needle insertions to perform biopsies as shown in figure 1: To reach the target tissue, clinicians must pierce through several layers of different types of tissue; the SUHFLVLRQ RI WKLV LQVHUWLRQ GHSHQGV RQ WKH FOLQLFLDQ¶V knowledge of anatomy, spatial representation and haptic perception
Preliminary results show that the training with visual cues does not significantly improve the time to task completion in the post-test (Figure 5)
When the participants received the visual aid for the first time, they could see the direct link between the force they applied and the graph plotted on the screen
Summary
In several medical procedures clinicians depend on their haptic perception abilities to insert needles in the patient; for example, in the administration of drugs and in radiological percutaneous needle insertions to perform biopsies as shown in figure 1: To reach the target tissue, clinicians must pierce through several layers of different types of tissue; the SUHFLVLRQ RI WKLV LQVHUWLRQ GHSHQGV RQ WKH FOLQLFLDQ¶V knowledge of anatomy, spatial representation and haptic perception. This knowledge and perception ability is gained through years of experience in clinical practice. Perrault, Schwaitzberg and Cao [2][3] used the image coming from an endoscope to give information about the position of the tool and the amount of force applied by subjects; whereas Gerovich [1] used a simulation in which the user could see the different layers of tissue being tested and the real-time position of the needle in a needle-insertion task
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