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Independent coding of target distance and direction in visuo-spatial working memory
1Dipartimento di Fisiologia Umana e Funzioni Biologiche Integrate Filippo Bottazzi, II Università di Napoli, Italy.
Psychological Research
|January 1, 1997
Summary
Spatial working memory encodes visual location direction and distance independently, suggesting motor-related representations. This independence is crucial for planning reaching movements.
Area of Science:
- Cognitive Neuroscience
- Human Motor Control
- Spatial Cognition
Background:
- Manual reaching movements exhibit independent programming of direction and distance.
- The representation of visually-presented locations in short-term memory is hypothesized to be motoric and independent.
Purpose of the Study:
- To investigate whether spatial working memory encodes visual location direction and distance independently.
- To explore the role of motoric coding in spatial short-term memory.
Main Methods:
- Two experiments tested adult humans' ability to remember visual target locations presented egocentrically in darkness.
- Experiment 1 examined temporal decay of location memory (4-30s).
- Experiment 2 assessed interference effects when remembering sequential locations.
Main Results:
- Memory for both direction and distance decayed over time, with distance errors greater in left hemispace.
- Direction and distance errors were uncorrelated, indicating independent encoding.
- Encoding a second location selectively interfered with directional memory, not distance memory.
Conclusions:
- Spatial working memory encodes egocentric visual locations with independent direction and distance parameters.
- Findings strongly suggest the use of motor-related representations in spatial working memory.
- The study contributes to understanding multiple spatial representations in visuo-spatial short-term memory.