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Numbers in Action.

Rosa Rugani1, Luisa Sartori1

  • 1Department of General Psychology, University of Padova Padova, Italy.

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Summary
This summary is machine-generated.

Humans instinctively map numbers onto a mental number line (MNL), influencing spatial responses. This review explores how number magnitude affects movement execution, impacting the understanding of the MNL.

Keywords:
SNARC effectaction executionaction planningkinematicmental number linenumber

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human cognition

Background:

  • Humans commonly conceptualize numbers on a mental number line (MNL), with smaller numbers on the left and larger numbers on the right.
  • The spatial-numerical association of response codes (SNARC) effect, demonstrated by faster left-sided responses to small numbers and right-sided responses to large numbers, provides experimental evidence for the MNL.
  • Previous research primarily relied on response times and accuracy, with limited investigation into kinematic parameters.

Purpose of the Study:

  • To review evidence suggesting that numerical magnitude influences not only response accuracy and speed but also the kinematic aspects of action execution.
  • To highlight the potential impact of kinematic measures on understanding the orientation and development of the MNL.
  • To discuss the implications for the debate on the role of experience and culture in shaping the MNL.

Main Methods:

  • Review of existing literature focusing on kinematic parameters in numerical cognition studies.
  • Analysis of studies examining movement characteristics, such as grip aperture during reaching-to-grasp tasks, in relation to numerical magnitude.
  • Synthesis of findings related to the temporal and spatial components of movement execution influenced by numerical processing.

Main Results:

  • Numerical magnitude affects the 'what' and 'how' of action execution, including temporal and spatial movement parameters.
  • Kinematic measures, like grip aperture, show systematic variations with numerical magnitude (e.g., larger grip aperture for larger numbers).
  • This suggests a more pervasive influence of numerical magnitude on motor control than previously emphasized.

Conclusions:

  • The mental number line (MNL) concept extends beyond simple response facilitation to influence motor execution.
  • Kinematic analysis offers a more sensitive window into the automatic processing of numerical magnitude.
  • Findings have significant implications for understanding the plasticity of the MNL and the interplay of experience, culture, and numerical cognition.