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| Content Provider | PubMed Central |
|---|---|
| Author | Loon, E. M. Van Hooge, I. Th C. Van Den Berg, A. V. |
| Abstract | According to the LATER model (linear approach to thresholds with ergodic rate), the latency of a single saccade in response to target appearance can be understood as a decision process, which is subject to (i) variations in the rate of (visual) information processing; and (ii) the threshold for the decision. We tested whether the LATER model can also be applied to the sequences of saccades in a multiple fixation search, during which latencies of second and subsequent saccades are typically shorter than that of the initial saccade. We found that the distributions of the reciprocal latencies for later saccades, unlike those of the first saccade, are highly asymmetrical, much like a gamma distribution. This suggests that the normal distribution of the rate r, which the LATER model assumes, is not appropriate to describe the rate distributions of subsequent saccades in a scanning sequence. By contrast, the gamma distribution is also appropriate to describe the distribution of reciprocal latencies for the first saccade. The change of the gamma distribution parameters as a function of the ordinal number of the saccade suggests a lowering of the threshold for second and later saccades, as well as a reduction in the number of target elements analysed. |
| Related Links | http://dx.doi.org/10.1098/rspb.2002.2062 |
| Starting Page | 1571 |
| File Format | |
| ISSN | 14712954 |
| e-ISSN | 14712954 |
| Journal | Proceedings of the Royal Society B: Biological Sciences |
| Issue Number | 1500 |
| Volume Number | 269 |
| Language | English |
| Publisher Date | 2002-08-07 |
| Access Restriction | Open |
| Subject Keyword | Biological Sciences Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
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