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Deriving the number of salience maps an observer has from the number and quality of concurrent centroid judgments.
- Source :
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Proceedings of the National Academy of Sciences of the United States of America . 5/23/2023, Vol. 120 Issue 21, p1-12. 19p. - Publication Year :
- 2023
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Abstract
- [C. Koch, S. Ullman, Hum. Neurobiol. 4, 219-227 (1985)] proposed a 2D topographical salience map that took feature-map outputs as its input and represented the importance "saliency" of the feature inputs at each location as a real number. The computation on the map, "winner-take-all," was used to predict action priority. We propose that the same or a similar map is used to compute centroid judgments, the center of a cloud of diverse items. [P. Sun, V. Chu, G. Sperling, Atten. Percept. Psychophys. 83, 934-955 (2021)] demonstrated that following a 250-msec exposure of a 24-dot array of 3 intermixed colors, subjects could accurately report the centroid of each dot color, thereby indicating that these subjects had at least three salience maps. Here, we use a postcue, partial-report paradigm to determine how many more salience maps subjects might have. In 11 experiments, subjects viewed 0.3-s flashes of 28 to 32 item arrays composed of M, M = 3,...,8, different features followed by a cue to mouse-click the centroid of items of just the post-cued feature. Ideal detector response analyses show that subjects utilized at least 12 to 17 stimulus items. By determining whether a subject's performance in (M-1)-feature experiments could/could-not predict performance in M-feature experiments, we conclude that one subject has at least 7 and the other two have at least five salience maps. A computational model shows that the primary performance-limiting factors are channel capacity for representing so many concurrently presented groups of items and working-memory capacity for so many computed centroids. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CENTROID
*TOPOGRAPHIC maps
*REAL numbers
*SHORT-term memory
Subjects
Details
- Language :
- English
- ISSN :
- 00278424
- Volume :
- 120
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America
- Publication Type :
- Academic Journal
- Accession number :
- 174701475
- Full Text :
- https://doi.org/10.1073/pnas.2301707120