Bloch's law and the dynamics of feature fusion

Frank Scharnowski, Frouke Hermens, Michael H Herzog

Research output: Contribution to journalArticleScientificpeer-review

Abstract

How the visual brain integrates temporally dispersed information is an open question. Often, it is assumed that the visual system simply sums light over a certain period of time (e.g. Bloch's law). However, in feature fusion, information presented later dominates, suggesting complex temporal dynamics that cannot be described by simple energy summation. For example, if two verniers are presented in rapid succession at the same location, they are not perceived individually but they fuse to one single vernier. The perceived offset of the fused vernier is a combination of the offsets of the two presented verniers, with the later one dominating. Here, we show that indeed, Bloch's law does not hold across verniers in a sequence. However, changes in the luminance of a single vernier can be compensated for by changes in its duration in accordance with Bloch's law. We present a simple model to demonstrate that these findings can be explained by decaying neural activation.

Original languageEnglish
Pages (from-to)2444-52
Number of pages9
JournalVision Research
Volume47
Issue number18
DOIs
Publication statusPublished - Aug 2007
Externally publishedYes

Keywords

  • Adult
  • Female
  • Form Perception/physiology
  • Humans
  • Lighting
  • Male
  • Models, Neurological
  • Photic Stimulation/methods
  • Psychophysics
  • Time Factors
  • Time Perception/physiology
  • Visual Cortex/physiology

Cite this

Scharnowski, F., Hermens, F., & Herzog, M. H. (2007). Bloch's law and the dynamics of feature fusion. Vision Research, 47(18), 2444-52. https://doi.org/10.1016/j.visres.2007.05.004
Scharnowski, Frank ; Hermens, Frouke ; Herzog, Michael H. / Bloch's law and the dynamics of feature fusion. In: Vision Research. 2007 ; Vol. 47, No. 18. pp. 2444-52.
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title = "Bloch's law and the dynamics of feature fusion",
abstract = "How the visual brain integrates temporally dispersed information is an open question. Often, it is assumed that the visual system simply sums light over a certain period of time (e.g. Bloch's law). However, in feature fusion, information presented later dominates, suggesting complex temporal dynamics that cannot be described by simple energy summation. For example, if two verniers are presented in rapid succession at the same location, they are not perceived individually but they fuse to one single vernier. The perceived offset of the fused vernier is a combination of the offsets of the two presented verniers, with the later one dominating. Here, we show that indeed, Bloch's law does not hold across verniers in a sequence. However, changes in the luminance of a single vernier can be compensated for by changes in its duration in accordance with Bloch's law. We present a simple model to demonstrate that these findings can be explained by decaying neural activation.",
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Scharnowski, F, Hermens, F & Herzog, MH 2007, 'Bloch's law and the dynamics of feature fusion', Vision Research, vol. 47, no. 18, pp. 2444-52. https://doi.org/10.1016/j.visres.2007.05.004

Bloch's law and the dynamics of feature fusion. / Scharnowski, Frank; Hermens, Frouke; Herzog, Michael H.

In: Vision Research, Vol. 47, No. 18, 08.2007, p. 2444-52.

Research output: Contribution to journalArticleScientificpeer-review

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