Abstract
In four experiments, a computerized Corsi-like paradigm was used to assess which of the many reference frames are used in visuospatial short-term memory. By varying the relative orientation (slanted +/–45° or in an upright position) of the head and the displays, we modulate the utility of the allocentric, egocentric (eye- and head-centred), and template-centred reference frames. The results of all experiments showed the crucial importance of the gravitational allocentric reference frames while using visuospatial short-term memory to retain a spatial sequence of elements. The results also provide some support for a mental rotation process involved in recognition following angular displacement of a multi-item display.
Acknowledgments
The research was supported by two PRIN grants “Studio dell'evoluzione temporale dell'intenzionalita' motoria nel lobo frontale” and “Studio neuropsicologico della rappresentazione e della pianificazione delle azioni nello spazio e nel tempo”.
Notes
1 With the label allocentric gravitational FoR we refer to a reference system in which gravitational force is the main, but not necessarily the only, reference frame with respect to which objects are encoded.
2 We use the term “available” with the meaning of convenient or usable for a correct encoding of the elements position, although all three FoR were accessible.