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This paper describes an experimental study that aims at assessing the actualcontribution of voice system messages to visual search efficiency and comfort.Messages which include spatial information on the target location are meant tosupport search for familiar targets in collections of photographs (30 perdisplay). 24 participants carried out 240 visual search tasks in two conditionsdiffering from each other in initial target presentation only. The isolatedtarget was presented either simultaneously with an oral message (multimodalpresentation, MP), or without any message (visual presentation, VP). Averagedtarget selection times were thrice longer and errors almost twice more frequentin the VP condition than in the MP condition. In addition, the contribution ofspatial messages to visual search rapidity and accuracy was influenced bydisplay layout and task difficulty. Most results are statistically significant.Besides, subjective judgments indicate that oral messages were well accepted.

Assistance orale \`a la recherche visuelle - \'etude exp\'erimentale de l'apport d'indications spatiales \`a la d\'etection de cibles