A theory of magnitude: common cortical metrics of time, space and quantity

  title={A theory of magnitude: common cortical metrics of time, space and quantity},
  author={Vincent Walsh},
  journal={Trends in Cognitive Sciences},
  • Vincent Walsh
  • Published 1 November 2003
  • Psychology
  • Trends in Cognitive Sciences
The parietal cortex and the representation of time, space, number and other magnitudes
  • D. Bueti, V. Walsh
  • Psychology, Biology
    Philosophical Transactions of the Royal Society B: Biological Sciences
  • 2009
The contention that generalized magnitude processing is a more accurate conceptual description of how the brain deals with information about time, space, number and other dimensions is discussed.
Development of a Possible General Magnitude System for Number and Space
Investigation of the association between discrete non-symbolic number processing and continuous spatial processing in children between the third and sixth grade suggests the existence of a more complex underlying magnitude system consisting of dissociated but closely interacting representations for continuous and discrete magnitudes.
Space and time in the brain
This work suggests investigating how brain mechanisms give rise to inferential, model-building explanations, and suggests searching for brain representations of the authors' preconceived ideas instead of searching for space or time representations.
Representations of space, time, and number in neonates
It is shown that, at the beginning of postnatal life, 0- to 3-d-old neonates reacted to a simultaneous increase in spatial extent and in duration or numerical quantity, but they did not react when the magnitudes varied in opposite directions.
Nature and Nurture in Numerical Cognition : Investigating the Idea of a Generalized Magnitude System for Number, Space, and Time
Current research in the field of numerical cognition reveals strong behavioral interactions and similar processing mechanisms for the perceptions of space, time, and number; which is generally
A magnitude system for the processing of time, space and quantity?
Discussion Inter-modality interactions (1) Negatively correlated mapping of space and quantity: increase in one modality leads to decreased judgment in the other (2) Space and quantity judgements
Dimensional overlap between time and space
The results of two experiments that draw on the predictions of the dimensional overlap model support the view that the representations of time and space are strongly linked.
A common representation for semantic and physical properties: a cognitive-anatomical approach.
It is proposed that the processing of semantic and physical magnitude information is carried out by a shared brain structure that subserves various comparison processes by representing various quantities on an amodal magnitude scale.
When time is space: Evidence for a mental time line
From duration and distance comparisons to goal encoding in prefrontal cortex.
This chapter introduces the role of the prefrontal cortex (PF) in coding relative durations and describes the comparison mechanisms that are implemented by PF to make perceptual decisions about durations in relation to those involved in making decisions about spatial locations and distances.


Time: the back-door of perception
Parietal Representation of Symbolic and Nonsymbolic Magnitude
Functional brain imaging results confirm the hypothesis that quantity is represented by a common mechanism for both symbolic and nonsymbolic stimuli in IPS.
Representation of the Quantity of Visual Items in the Primate Prefrontal Cortex
Deriving the quantity of items is an abstract form of categorization. To explore it, monkeys were trained to judge whether successive visual displays contained the same quantity of items. Many
The representation of temporal information in perception and motor control
  • R. Ivry
  • Biology, Psychology
    Current Opinion in Neurobiology
  • 1996
Are Subitizing and Counting Implemented as Separate or Functionally Overlapping Processes?
This paper presents a PET study that attempts to characterize subitizing and counting at a neural level in order to investigate whether they are implemented as separate or functionally overlapping processes, and results speak against the idea of the two processes being implemented in separable neural systems.
Does Action Make the Link Between Number and Space Representation?
It is shown that a short visuo-manual adaptation to prisms improves performance on a mental number-bisection task recently shown to be impaired in unilateral neglect, and suggests that vis Luo-motor plasticity functionally links parietal areas involved in space and number representation.
Time perception in a neglected space
It is suggested that encoding duration in the hundreds of milliseconds range is a process based on an internal clock mechanism that varies as a function of the processing load.