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Erwan Normand
2024-09-22 15:28:36 +02:00
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2-perception/xr-perception/5-discussion.tex
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@@ -18,7 +18,7 @@ Surprisingly, the PSE of the \level{Real} rendering was shifted to the right (to
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The sensitivity of participants to roughness differences (just-noticeable differences, JND) also varied between all the visual renderings, with the \level{Real} rendering having the best JND (\percent{26}), followed by the \level{Virtual} (\percent{30}) and \level{Virtual} (\percent{33}) renderings (\figref{results/trial_jnds}).
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These JND values are in line with and at the upper end of the range of previous studies~\cite{choi2013vibrotactile}, which may be due to the location of the actuator on the top of the middle phalanx of the finger, being less sensitive to vibration than the fingertip.
These JND values are in line with and at the upper end of the range of previous studies \cite{choi2013vibrotactile}, which may be due to the location of the actuator on the top of the middle phalanx of the finger, being less sensitive to vibration than the fingertip.
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Thus, compared to no visual rendering (\level{Real}), the addition of a visual rendering of the hand or environment reduced the roughness sensitivity (JND) and the average roughness perception (PSE), as if the virtual haptic textures felt \enquote{smoother}.
@@ -50,15 +50,15 @@ Thereby, we hypothesise that the differences in the perception of vibrotactile r
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\textcite{diluca2011effects} demonstrated, in a VST-AR setup, how visual latency relative to proprioception increased the perception of stiffness of a virtual piston, while haptic latency decreased it.
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Another complementary explanation could be a pseudo-haptic effect of the displacement of the virtual hand, as already observed with this vibrotactile texture rendering, but seen on a screen in a non-immersive context~\cite{ujitoko2019modulating}.
Another complementary explanation could be a pseudo-haptic effect of the displacement of the virtual hand, as already observed with this vibrotactile texture rendering, but seen on a screen in a non-immersive context \cite{ujitoko2019modulating}.
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Such hypotheses could be tested by manipulating the latency and tracking accuracy of the virtual hand or the vibrotactile feedback. % to observe their effects on the roughness perception of the virtual textures.
The main limitation of our study is, of course, the absence of a visual representation of the touched virtual texture.
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This is indeed a source of information as important as haptic sensations for perception for both real textures~\cite{baumgartner2013visual,bergmanntiest2007haptic,vardar2019fingertip} and virtual textures~\cite{degraen2019enhancing,gunther2022smooth,normand2024augmenting}.
This is indeed a source of information as important as haptic sensations for perception for both real textures \cite{baumgartner2013visual,bergmanntiest2007haptic,vardar2019fingertip} and virtual textures \cite{degraen2019enhancing,gunther2022smooth,normand2024augmenting}.
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%Specifically, it remains to be investigated how to visually represent vibrotactile textures in an immersive AR or VR context, as the visuo-haptic coupling of such grating textures is not trivial~\cite{unger2011roughness} even with real textures~\cite{klatzky2003feeling}.
%Specifically, it remains to be investigated how to visually represent vibrotactile textures in an immersive AR or VR context, as the visuo-haptic coupling of such grating textures is not trivial \cite{unger2011roughness} even with real textures \cite{klatzky2003feeling}.
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The interactions between the visual and haptic sensory modalities is complex and deserves further investigations, in particular in the context of visuo-haptic AR.
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