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Unilateral neglect and perceptual parsing: a large-group study
Marco Neppi-Mòdona1, Silvia Savazzi, Raffaella Ricci
1Dipartimento di Psicologia, Università di Torino, Via Po 14, Italy. neppi@psych.unito.it
Neuropsychologia
|September 5, 2002
Summary
This study disambiguated array-centred and subarray-centred neglect in 116 patients. Neglect was more frequent in array-centred coordinates, sometimes co-occurring in both systems, suggesting multiple reference frames for spatial representation.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Left neglect is a common consequence of brain damage, affecting spatial awareness.
- Previous research suggests neglect can be understood within different spatial reference frames.
Purpose of the Study:
- To disambiguate array-centred and subarray-centred neglect.
- To investigate the relationship between these two types of neglect and their underlying neural correlates.
Main Methods:
- A modified Albert test was administered to 116 patients with left neglect.
- The test involved deleting the central column of segments to create separate target sets based on proximity.
Main Results:
- Neglect was more prevalent in array-centred coordinates compared to subarray-centred coordinates.
- A minority of patients exhibited neglect in both coordinate systems simultaneously.
- Functional but not anatomical dissociation was observed between the two neglect types.
Conclusions:
- Spatial neglect can manifest within single or multiple reference frames concurrently.
- These findings align with current models of spatial representation in neuropsychology, neurophysiology, and computational neuroscience.