• J Heiz, S Majerus, and K Barisnikov.
• University of Geneva, Department of Psychology, Child Clinical Neuropsychology Unit, 1211 Genève 4, Switzerland.
• Arch Clin Neuropsychol. 2018 Aug 1; 33 (5): 619-630.

ObjectiveThis study examined the spontaneous use of allocentric and egocentric frames of reference and their flexible use as a function of instructions.MethodThe computerized spatial reference task created by Heiz and Barisnikov (2015) was used. Participants had to choose a frame of reference according to three types of instructions: spontaneous, allocentric and egocentric. The performances of 16 Williams Syndrome participants between 10 and 41 years were compared to those of two control groups (chronological age and non-verbal intellectual ability).ResultsThe majority of Williams Syndrome participants did not show a preference for a particular frame of reference. When explicitly inviting participants to use an allocentric frame of reference, all three groups showed an increased use of the allocentric frame of reference. At the same time, an important heterogeneity of type of frame of reference used by Williams Syndrome participants was observed.ConclusionResults demonstrate that despite difficulties in the spontaneous use of allocentric and egocentric frames of reference, some Williams Syndrome participants show flexibility in the use of an allocentric frame of reference when an explicit instruction is provided.

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