An ERP investigation of symbolic and nonsymbolic fraction processing
Jay, Victoria Lynn
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https://hdl.handle.net/2142/105868
Description
Title
An ERP investigation of symbolic and nonsymbolic fraction processing
Author(s)
Jay, Victoria Lynn
Issue Date
2019-06-17
Director of Research (if dissertation) or Advisor (if thesis)
Hyde, Daniel C
Department of Study
Psychology
Discipline
Psychology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
fraction processing
ratio processing
event-related potential
ERP
Abstract
Fractions, though important, pose significant difficulties for children and adults. It has been suggested that this difficulty may stem from a lack of an underlying cognitive system that allows us direct, intuitive access to fraction magnitude. However, there is mounting evidence that processing ratios can indeed be intuitive (not accessed via explicit strategies). Currently, limitations in temporal resolution of previous studies means we still have little evidence of whether people have direct access to fraction magnitude, or whether they need to work through the whole-number numerator and denominator components to reach holistic fraction magnitude. We address limitations in temporal resolution by using event-related potentials (ERP) to analyze the time course of symbolic and nonsymbolic fraction processing. The improved temporal resolution with a fraction comparison task allow us to investigate whether access to fraction magnitude is both direct and intuitive. We find evidence for intra-fraction distance effects in P2p and holistic distance effects for nonsymbolic ratios in P3, providing evidence for a step-wise mechanism of fraction processing.
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