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Optogenetic Stimulation of the Auditory Nerve
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Can auditory objects be subitized?

Katherine L Roberts1, Nicola J Doherty2, Elizabeth A Maylor2

  • 1Department of Psychology, Nottingham Trent University.

Journal of Experimental Psychology. Human Perception and Performance
|October 10, 2018
PubMed
Summary
This summary is machine-generated.

Humans can visually subitize up to 4 objects, but auditory subitizing is limited to 2-3 sounds, especially when spatially separated. This suggests auditory tagging difficulties do not significantly impact older adults in noisy environments.

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Area of Science:

  • Cognitive Psychology
  • Auditory Perception
  • Human-Computer Interaction

Background:

  • Humans possess a visual subitizing ability, enabling rapid enumeration of up to 4 objects.
  • This visual capacity allows for monitoring, attention, and interaction with multiple items.
  • The existence and characteristics of a similar auditory subitizing mechanism remain largely unexplored.

Purpose of the Study:

  • To investigate the existence of an auditory subitizing mechanism.
  • To determine the capacity of auditory enumeration and compare it to visual subitizing.
  • To explore factors influencing auditory subitizing, such as spatial and temporal separation of stimuli.

Main Methods:

  • Three experiments were conducted to assess auditory enumeration accuracy.
  • Stimuli were presented spatially separated in Experiments 1 and 2.
  • Stimuli were temporally separated in Experiment 3 to examine auditory subitizing.

Main Results:

  • High accuracy in auditory enumeration was observed for 2 or 3 stimuli, suggesting a potential subitizing mechanism.
  • Auditory subitizing was evident only when stimuli were spatially separated.
  • Temporal separation of auditory stimuli did not yield evidence of subitizing.
  • Limited age-related decline in auditory enumeration of small numbers was found.

Conclusions:

  • Auditory subitizing may exist but appears limited to approximately 2 spatially separated objects.
  • The difficulty in parsing auditory scenes restricts the capacity of auditory tagging.
  • Auditory tagging limitations are unlikely to be a primary cause of older adults' challenges in multitalker conversations.