WIP visuo-haptic hand

4-conclusion/conclusion.tex

@@ -35,6 +35,16 @@ While these tasks are fundamental building blocks for more complex manipulation
 Similarly, a broader experimental study might shed light on the role of gender and age, as our subject pool was not sufficiently diverse in this regard.
 Finally, all visual hand renderings received low and high rank rates from different participants, suggesting that users should be able to choose and personalize some aspects of the visual hand rendering according to their preferences or needs, and this should be also be evaluated.
 
+\subsection*{Haptic Rendering of the Hand for Manipulating Virtual Objects in Augmented Reality}
+
+As we already said in \secref[visual_hand]{discussion}, these results have some limitations as they address limited types of visuo-haptic renderings and manipulations were restricted to the thumb and index fingertips.
+While the simpler vibration technique (Impact technique) was sufficient to confirm contacts with the cube, richer vibrotactile renderings may be required for more complex interactions, such as collision or friction renderings between objects \cite{kuchenbecker2006improving, pacchierotti2015cutaneous} or texture rendering \cite{culbertson2014one, asano2015vibrotactile}.
+More generally, a broader range of haptic sensations should be considered, such as pressure or stretching of the skin \cite{maisto2017evaluation, teng2021touch}.
+However, moving the point of application of the sensation away may be challenging for some types of haptic rendering.
+Similarly, as the interactions were limited to the thumb and index fingertips, positioning a delocalized haptic rendering over a larger area of the hand could be challenging and remains to be explored.
+Also, given that some users found the vibration rendering too strong, adapting/personalizing the haptic feedback to one's preference (and body positioning) might also be a promising approach.
+Indeed, personalized haptics is recently gaining interest in the community \cite{malvezzi2021design, umair2021exploring}.
+
 \section*{Perspectives}
 
 % systematic exploration of the parameter space of the haptic rendering to determine the most important parameters their influence on the perception