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Remove \VO and \AE acronym

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Erwan Normand
2024-10-18 14:49:07 +02:00
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3-manipulation/visuo-haptic-hand/1-introduction.tex
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@@ -6,22 +6,22 @@ Moreover, it is important to leave the user capable of interacting with both vir
For this reason, it is often considered beneficial to move the point of application of the haptic feedback elsewhere on the hand (\secref[related_work]{vhar_haptics}).
However, the impact of the positioning of the haptic feedback on the hand during direct hand manipulation in \AR has not been systematically studied.
Conjointly, a few studies have explored and compared the effects of visual and haptic feedback in tasks involving the manipulation of \VOs with the hand.
Conjointly, a few studies have explored and compared the effects of visual and haptic feedback in tasks involving the manipulation of virtual objects with the hand.
\textcite{sarac2022perceived} and \textcite{palmer2022haptic} studied the effects of providing haptic feedback about contacts at the fingertips using haptic devices worn at the wrist, testing different mappings.
Their results proved that moving the haptic feedback away from the point(s) of contact is possible and effective, and that its impact is more significant when the visual feedback is limited.
A final question is whether one or the other of these (haptic or visual) hand feedback should be preferred \cite{maisto2017evaluation,meli2018combining}, or whether a combined visuo-haptic feedback is beneficial for users.
However, these studies were conducted in non-immersive setups, with a screen displaying the \VE view.
In fact, both hand feedback can provide sufficient sensory feedback for efficient direct hand manipulation of \VOs in \AR, or conversely, they can be shown to be complementary.
In fact, both hand feedback can provide sufficient sensory feedback for efficient direct hand manipulation of virtual objects in \AR, or conversely, they can be shown to be complementary.
In this chapter, we aim to investigate the role of \textbf{visuo-haptic feedback of the hand when manipulating \VO} in immersive \OST-\AR using wearable vibrotactile haptics.
In this chapter, we aim to investigate the role of \textbf{visuo-haptic feedback of the hand when manipulating virtual object} in immersive \OST-\AR using wearable vibrotactile haptics.
We selected \textbf{four different delocalized positionings on the hand} that have been previously proposed in the literature for direct hand interaction in \AR using wearable haptic devices (\secref[related_work]{vhar_haptics}): on the nails, the proximal phalanges, the wrist, and the nails of the opposite hand.
We focused on vibrotactile feedback, as it is used in most of the wearable haptic devices and has the lowest encumbrance.
In a \textbf{user study}, using the \OST-\AR headset Microsoft HoloLens~2 and two \ERM vibrotactile motors, we evaluated the effect of the four positionings with \textbf{two contact vibration techniques} on the user performance and experience with the same two manipulation tasks as in \chapref{visual_hand}.
We additionally compared these vibrotactile renderings with the \textbf{skeleton-like visual hand augmentation} established in the \chapref{visual_hand} as a complementary visuo-haptic feedback of the hand interaction with the \VOs.
We additionally compared these vibrotactile renderings with the \textbf{skeleton-like visual hand augmentation} established in the \chapref{visual_hand} as a complementary visuo-haptic feedback of the hand interaction with the virtual objects.
\noindentskip The contributions of this chapter are:
\begin{itemize}
\item The evaluation in a user study with 20 participants of the effect of providing a vibrotactile feedback of the fingertip contacts with \VOs, during direct manipulation with bare hand in \AR, at four different delocalized positionings of the haptic feedback on the hand and with two contact vibration techniques.
\item The evaluation in a user study with 20 participants of the effect of providing a vibrotactile feedback of the fingertip contacts with virtual objects, during direct manipulation with bare hand in \AR, at four different delocalized positionings of the haptic feedback on the hand and with two contact vibration techniques.
\item The comparison of these vibrotactile positionings and renderings techniques with the two most representative visual hand augmentations established in the \chapref{visual_hand}.
\end{itemize}