Simpler section reference labels

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\section{Introduction}
\label{sec:introduction}
\label{introduction}

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\section{User Study}
\label{sec:method}
\label{method}
Providing haptic feedback during free-hand manipulation in AR is not trivial, as wearing haptic devices on the hand might affect the tracking capabilities of the system.
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@@ -13,7 +13,7 @@ The chosen visuo-haptic hand renderings are the combination of the two most repr
\subsection{Vibrotactile Renderings}
\label{sec:vibration}
\label{vibration}
The vibrotactile hand rendering provided information about the contacts between the virtual object and the thumb and index fingers of the user, as they were the two fingers most used for grasping in our first experiment.
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@@ -21,7 +21,7 @@ We evaluated both the delocalized positioning and the contact vibration techniqu
\subsubsection{Vibrotactile Positionings}
\label{sec:positioning}
\label{positioning}
\fig[0.30]{method/locations}{%
Experiment \#2: setup of the vibrotactile devices.
@@ -45,7 +45,7 @@ We evaluated both the delocalized positioning and the contact vibration techniqu
\subsubsection{Contact Vibration Techniques}
\label{sec:technique}
\label{technique}
When a fingertip contacts the virtual cube, we activate the corresponding vibrating actuator.
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@@ -70,7 +70,7 @@ Similarly, we designed the distance vibration technique (Dist) so that interpene
\subsection{Experimental Design}
\label{sec:design}
\label{design}
\begin{subfigs}{tasks}{%
Experiment \#2. The two manipulation tasks: %
@@ -115,7 +115,7 @@ This design led to a total of 5 vibrotactile positionings \x 2 vibration contact
\subsection{Apparatus and Protocol}
\label{sec:apparatus}
\label{apparatus}
Apparatus and protocol were very similar to the first experiment, as described in \secref[visual_hand]{apparatus} and \secref[visual_hand]{protocol}, respectively.
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\subsection{Collected Data}
\label{sec:metrics}
\label{metrics}
During the experiment, we collected the same data as in the first experiment, see \secref[visual_hand]{metrics}.
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\subsection{Participants}
\label{sec:participants}
\label{participants}
Twenty subjects participated in the study (mean age = 26.8, SD = 4.1; 19~males, 1~female).
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\subsection{Push Task}
\label{sec:push}
\label{push}
\subsubsection{Completion Time}
\label{sec:push_tct}
\label{push_tct}
On the time to complete a trial, there were two statistically significant effects: %
Positioning (\anova{4}{1990}{3.8}, \p{0.004}, see \figref{results/Push-CompletionTime-Location-Overall-Means}) %
@@ -18,7 +18,7 @@ The NW target volume was also faster than the SW (\p{0.05}).
\subsubsection{Contacts}
\label{sec:push_contacts_count}
\label{push_contacts_count}
On the number of contacts, there was one statistically significant effect of %
Positioning (\anova{4}{1990}{2.4}, \p{0.05}, see \figref{results/Push-Contacts-Location-Overall-Means}).
@@ -29,7 +29,7 @@ This could indicate more difficulties to adjust the virtual cube inside the targ
\subsubsection{Time per Contact}
\label{sec:push_time_per_contact}
\label{push_time_per_contact}
On the mean time spent on each contact, there were two statistically significant effects of %
Positioning (\anova{4}{1990}{11.5}, \pinf{0.001}, see \figref{results/Push-TimePerContact-Location-Overall-Means}) %

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\subsection{Grasp Task}
\label{sec:grasp}
\label{grasp}
\subsubsection{Completion Time}
\label{sec:grasp_tct}
\label{grasp_tct}
On the time to complete a trial, there were two statistically significant effects: %
Positioning (\anova{4}{3990}{13.6}, \pinf{0.001}, see \figref{results/Grasp-CompletionTime-Location-Overall-Means}) %
@@ -18,7 +18,7 @@ and SW was faster than NE (\p{0.03}).
\subsubsection{Contacts}
\label{sec:grasp_contacts_count}
\label{grasp_contacts_count}
On the number of contacts, there were two statistically significant effects: %
Positioning (\anova{4}{3990}{15.1}, \pinf{0.001}, see \figref{results/Grasp-Contacts-Location-Overall-Means}) %
@@ -32,7 +32,7 @@ It was also easier on SW than on NE (\pinf{0.001}), NW (\p{0.006}), or SE (\p{0.
\subsubsection{Time per Contact}
\label{sec:grasp_time_per_contact}
\label{grasp_time_per_contact}
On the mean time spent on each contact, there were two statistically significant effects: %
Positioning (\anova{4}{3990}{2.9}, \p{0.02}, see \figref{results/Grasp-TimePerContact-Location-Overall-Means}) %
@@ -46,7 +46,7 @@ but longer on SW than on NE or NW (\pinf{0.001}).
\subsubsection{Grip Aperture}
\label{sec:grasp_grip_aperture}
\label{grasp_grip_aperture}
On the average distance between the thumb's fingertip and the other fingertips during grasping, there were two
statistically significant effects: %

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\subsection{Discrimination of Vibration Techniques}
\label{sec:technique_results}
\label{technique_results}
Seven participants were able to correctly discriminate between the two vibration techniques, which they described as the contact vibration (being the Impact technique) and the continuous vibration (being the Distance technique) respectively.
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\subsection{Questionnaire}
\label{sec:questions}
\label{questions}
\begin{subfigswide}{questions}{%
Experiment \#2. Boxplots of the questionnaire results of each vibrotactile positioning
@@ -42,7 +42,7 @@ Only significant results are reported.
\subsubsection{Vibrotactile Rendering Rating}
\label{sec:vibration_ratings}
\label{vibration_ratings}
There was a main effect of Positioning (\anova{4}{171}{27.0}, \pinf{0.001}).
%
@@ -54,7 +54,7 @@ And Wrist more than Opposite (\p{0.01}) and No Vibration (\pinf{0.001}).
\subsubsection{Positioning \x Hand Rating}
\label{sec:positioning_hand}
\label{positioning_hand}
There were two main effects of Positioning (\anova{4}{171}{20.6}, \pinf{0.001}) and of Hand (\anova{1}{171}{12.2}, \pinf{0.001}).
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\subsubsection{Workload}
\label{sec:workload}
\label{workload}
There was a main of Positioning (\anova{4}{171}{3.9}, \p{0.004}).
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\subsubsection{Usefulness}
\label{sec:usefulness}
\label{usefulness}
There was a main effect of Positioning (\anova{4}{171}{38.0}, \p{0.041}).
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\subsubsection{Realism}
\label{sec:realism}
\label{realism}
There was a main effect of Positioning (\anova{4}{171}{28.8}, \pinf{0.001}).
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\section{Results}
\label{sec:results}
\label{results}
\begin{subfigswide}{grasp_results}{%
Experiment \#{2}: Grasp task.

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\section{Discussion}
\label{sec:discussion}
\label{discussion}
We evaluated sixteen visuo-haptic renderings of the hand, in the same two virtual object manipulation tasks in AR as in the first experiment, as the combination of two vibrotactile contact techniques provided at four delocalized positions on the hand with the two most representative visual hand renderings established in the first experiment.

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\section{Conclusion}
\label{sec:conclusion}
\label{conclusion}
This paper presented two human subject studies aimed at better understanding the role of visuo-haptic rendering of the hand during virtual object manipulation in OST-AR.
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