Formatting

3-manipulation/visuo-haptic-hand/2-method.tex

@@ -11,7 +11,6 @@ This second experiment aims to evaluate whether a visuo-haptic hand rendering af
 %
 The chosen visuo-haptic hand renderings are the combination of the two most representative visual hand renderings established in the first experiment, \ie Skeleton and None, described in \secref[visual_hand]{hands}, with two contact vibration techniques provided at four delocalized positions on the hand.
 
-
 \subsection{Vibrotactile Renderings}
 \label{vibration}
 
@@ -19,7 +18,6 @@ The vibrotactile hand rendering provided information about the contacts between
 %
 We evaluated both the delocalized positioning and the contact vibration technique of the vibrotactile hand rendering.
 
-
 \subsubsection{Vibrotactile Positionings}
 \label{positioning}
 
@@ -32,18 +30,17 @@ We evaluated both the delocalized positioning and the contact vibration techniqu
 }
 
 \begin{itemize}
-    \item \textit{Fingertips (Tips):} Vibrating actuators were placed right above the nails, similarly to \cite{ando2007fingernailmounted}. This is the positioning closest to the fingertips.
-          %
-    \item \textit{Proximal Phalanges (Prox):} Vibrating actuators were placed on the dorsal side of the proximal phalanges, similarly to \cite{maisto2017evaluation, meli2018combining, chinello2020modular}.
-          %
-    \item \textit{Wrist (Wris):} Vibrating actuators providing contacts rendering for the index and thumb were placed on ulnar and radial sides of the wrist, similarly to \cite{pezent2019tasbi, palmer2022haptic, sarac2022perceived}.
-          %
-    \item \textit{Opposite fingertips (Oppo):} Vibrating actuators were placed on the fingertips of contralateral hand, also above the nails, similarly to \cite{prattichizzo2012cutaneous, detinguy2018enhancing}.
-          %
-    \item \textit{Nowhere (Nowh):} As a reference, we also considered the case where we provided no vibrotactile rendering.
+  \item \textit{Fingertips (Tips):} Vibrating actuators were placed right above the nails, similarly to \cite{ando2007fingernailmounted}. This is the positioning closest to the fingertips.
+    %
+  \item \textit{Proximal Phalanges (Prox):} Vibrating actuators were placed on the dorsal side of the proximal phalanges, similarly to \cite{maisto2017evaluation, meli2018combining, chinello2020modular}.
+    %
+  \item \textit{Wrist (Wris):} Vibrating actuators providing contacts rendering for the index and thumb were placed on ulnar and radial sides of the wrist, similarly to \cite{pezent2019tasbi, palmer2022haptic, sarac2022perceived}.
+    %
+  \item \textit{Opposite fingertips (Oppo):} Vibrating actuators were placed on the fingertips of contralateral hand, also above the nails, similarly to \cite{prattichizzo2012cutaneous, detinguy2018enhancing}.
+    %
+  \item \textit{Nowhere (Nowh):} As a reference, we also considered the case where we provided no vibrotactile rendering.
 \end{itemize}
 
-
 \subsubsection{Contact Vibration Techniques}
 \label{technique}
 
@@ -52,8 +49,8 @@ When a fingertip contacts the virtual cube, we activate the corresponding vibrat
 We considered two representative contact vibration techniques, \ie two ways of rendering such contacts through vibrations:
 %
 \begin{itemize}
-    \item \textit{Impact (Impa):} a \qty{200}{\ms}--long vibration burst is applied when the fingertip makes contact with the object; the amplitude of the vibration is proportional to the speed of the fingertip at the moment of the contact.
-    \item \textit{Distance (Dist):} a continuous vibration is applied whenever the fingertip is in contact with the object; the amplitude of the vibration is proportional to the interpenetration between the fingertip and the virtual cube surface.
+  \item \textit{Impact (Impa):} a \qty{200}{\ms}--long vibration burst is applied when the fingertip makes contact with the object; the amplitude of the vibration is proportional to the speed of the fingertip at the moment of the contact.
+  \item \textit{Distance (Dist):} a continuous vibration is applied whenever the fingertip is in contact with the object; the amplitude of the vibration is proportional to the interpenetration between the fingertip and the virtual cube surface.
 \end{itemize}
 %
 The implementation of these two techniques have been tuned according to the results of a preliminary experiment.
@@ -68,7 +65,6 @@ For this reason, we designed the Impact vibration technique (Impa) so that conta
 %
 Similarly, we designed the distance vibration technique (Dist) so that interpenetrations from \qtyrange{0}{2.5}{\cm} are linearly mapped into \qtyrange{15}{100}{\%} amplitude commands for the motors, recalling that the virtual cube has an edge of \qty{5}{\cm}.
 
-
 \subsection{Experimental Design}
 \label{design}
 
@@ -101,10 +97,10 @@ Similarly, we designed the distance vibration technique (Dist) so that interpene
 We considered the same two tasks as in Experiment \#1, described in \secref[visual_hand]{tasks}, that we analyzed separately, considering four independent, within-subject variables:
 
 \begin{itemize}
-    \item \emph{{Vibrotactile Positioning}:} the five positionings for providing vibrotactile hand rendering of the virtual contacts, as described in \secref{positioning}.
-    \item \emph{Contact Vibration Technique}: the two contact vibration techniques, as described in \secref{technique}.
-    \item \emph{visual Hand rendering}: two visual hand renderings from the first experiment, Skeleton (Skel) and None, as described in \secref[visual_hand]{hands}; we considered Skeleton as it performed the best in terms of performance and perceived effectiveness and None as reference.
-    \item \emph{Target}: we considered target volumes located at NW and SW during the Push task, and at NE, NW, SW, and SE during the Grasp task (\figref{tasks}); we considered these targets because they presented different difficulties.
+  \item \emph{{Vibrotactile Positioning}:} the five positionings for providing vibrotactile hand rendering of the virtual contacts, as described in \secref{positioning}.
+  \item \emph{Contact Vibration Technique}: the two contact vibration techniques, as described in \secref{technique}.
+  \item \emph{visual Hand rendering}: two visual hand renderings from the first experiment, Skeleton (Skel) and None, as described in \secref[visual_hand]{hands}; we considered Skeleton as it performed the best in terms of performance and perceived effectiveness and None as reference.
+  \item \emph{Target}: we considered target volumes located at NW and SW during the Push task, and at NE, NW, SW, and SE during the Grasp task (\figref{tasks}); we considered these targets because they presented different difficulties.
 \end{itemize}
 
 To account for learning and fatigue effects, the positioning of the vibrotactile hand rendering (positioning) was counter-balanced using a balanced \numproduct{10 x 10} Latin square.
@@ -115,7 +111,6 @@ As we did not find any relevant effect of the order in which the tasks were perf
 
 This design led to a total of 5 vibrotactile positionings \x 2 vibration contact techniques \x 2 visual hand rendering \x (2 targets on the Push task + 4 targets on the Grasp task) \x 3 repetitions $=$ 420 trials per participant.
 
-
 \subsection{Apparatus and Protocol}
 \label{apparatus}
 
@@ -166,7 +161,6 @@ When the contact is lost, the spring is destroyed.
 %
 Preliminary tests confirmed this approach.
 
-
 \subsection{Collected Data}
 \label{metrics}
 
@@ -184,7 +178,6 @@ They then rated the ten combinations of Positioning \x Technique using a 7-item
 Finally, they rated the ten combinations of Positioning \x Hand on a 7-item Likert scale (1=Not at all, 7=Extremely): %
 \emph{(positioning \x Hand Rating)} How much do you like each combination of vibrotactile location for each visual hand rendering?
 
-
 \subsection{Participants}
 \label{participants}