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Area of Science:

  • Cognitive Psychology
  • Auditory Perception
  • Numerical Cognition

Background:

  • Fundamental questions in cognitive science concern the units over which mental processes operate.
  • Prior research shows visuospatial enumeration is influenced by discrete object segmentation.
  • The dynamic, temporal nature of real-world experience raises questions about enumeration in time.

Purpose of the Study:

  • To investigate whether temporal segmentation influences the process of enumeration.
  • To determine if discrete temporal events, like musical phrases, affect the perception of quantity.
  • To explore the automaticity of perceptual grouping in auditory enumeration.

Main Methods:

  • Participants enumerated the number of notes in musical sequences.
  • Musical sequences were temporally segmented into discrete phrases based on pitch-range shifts.
  • Controls were implemented for sequence duration, overall pitch range, and pitch heterogeneity.

Main Results:

  • Observers showed greater underestimation when notes were temporally segmented into musical phrases.
  • This effect occurred despite controls for duration and pitch characteristics.
  • Participants' enumeration was influenced by the perceived discrete units (phrases) rather than individual notes.

Conclusions:

  • Enumeration in time, like in space, is susceptible to perceptual segmentation.
  • Discrete events, such as musical phrases, serve as prominent units in mental processing.
  • The perceptual units guiding enumeration are not always under conscious, intentional control.