Fractal coordination in adults’ attention to hierarchical visual patterns

Ramon D. Castillo, Heidi Kloos, John G. Holden, Michael J. Richardson

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A display that contains hierarchically nested levels of order requires the perceiver to selectively attend to one of the levels. We investigate the degree to which such selective attention is sustained by a soft-assembled emergent coordinative process, one that does not require designated executive control. In the case of emergent soft-assembly, performance from one trial to the next should show characteristic interdependence, visible in the fractal structure of reaction time. To test this hypothesis, we asked participants across three experiments to decide whether two displays matched in a certain way (e.g., in a local element). In order to gauge this coordinative process, task constraints were experimentally manipulated (e.g., familiarity, predictability, and task instruction). Obtained reaction-time data were subjected to a spectral analysis to measure the degree of interdependence among trials. As predicted, results show correlated structure across trials, significantly different from what would be predicted by an independent-process view of selective attention. Results also show that the obtained spectral scaling exponents track the degree of coupling in the task as a function of the degree of task constraints. Findings are discussed in terms of the relative organism-environment coupling to sustain an adaptive behavior.
LanguageEnglish
Pages147-172
Number of pages26
JournalNonlinear Dynamics, Psychology, and Life Sciences
Volume19
Publication statusPublished - 2015
Externally publishedYes

Fingerprint

Fractals
Selective Attention
Fractal
Reaction Time
Display devices
Display
Spectrum analysis
Gages
Adaptive Behavior
Fractal Structure
Scaling Exponent
Predictability
Spectral Analysis
Gauge
Experiments
Experiment
Vision

Keywords

  • perceptual organization
  • Gestalt
  • fractal exponents
  • emergence
  • soft-assembly

Cite this

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Fractal coordination in adults’ attention to hierarchical visual patterns. / Castillo, Ramon D.; Kloos, Heidi; Holden, John G.; Richardson, Michael J.

In: Nonlinear Dynamics, Psychology, and Life Sciences, Vol. 19, 2015, p. 147-172.

Research output: Contribution to journalArticleResearchpeer-review

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