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Related Concept Videos

Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Related Experiment Video

Updated: Aug 30, 2025

Electroencephalographic Signal Acquisition Framework for Neurodiverse: A Case Study of Dolphin-Assisted Therapy
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Information-seeking across auditory scenes by an echolocating dolphin.

Heidi E Harley1,2, Wendi Fellner3, Candice Frances4,5

  • 1Division of Social Sciences, New College of Florida, 5800 Bay Shore Road, Sarasota, FL, 34243, USA. harley@ncf.edu.

Animal Cognition
|August 26, 2022
PubMed
Summary

Dolphins adjust their echolocation effort based on scene familiarity. As auditory scenes become more familiar, dolphins reduce their click production, indicating calibrated information-seeking behavior.

Keywords:
Auditory scenesDolphinsEcholocationMarine mammalsTop–down processing

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Area of Science:

  • Marine Biology
  • Animal Cognition
  • Sensory Systems

Background:

  • Dolphins utilize echolocation, a sensory system for navigating and perceiving their environment by emitting clicks and interpreting returning echoes.
  • The relationship between a dolphin's cognitive understanding of auditory scenes and their active information-seeking behavior through echolocation remains largely unexplored.

Purpose of the Study:

  • To investigate the top-down cognitive processes influencing dolphin echolocation behavior.
  • To determine how dolphins adjust their information-seeking effort based on the decipherability and familiarity of auditory scenes.

Main Methods:

  • An echoic matching-to-sample task was employed with a blindfolded dolphin, measuring click production as an indicator of information-seeking effort.
  • Auditory scenes and target samples varied in discriminability and shifted from unfamiliar to familiar over multiple sessions.
  • Performance accuracy and click counts were analyzed across different sets and experimental conditions.

Main Results:

  • Dolphin click counts decreased as auditory scenes became more familiar, with a more substantial decrease observed in less discriminable scenes.
  • Reduced echolocation effort in low-discriminability sets was not linked to overall motivation, as demonstrated by interleaved trials and object grouping.
  • In consistently challenging sets, click counts remained stable across sessions.

Conclusions:

  • Dolphins actively calibrate their echolocation information-seeking effort based on their learned knowledge and expectations of auditory scenes.
  • Cognitive factors, rather than just motivational states, play a significant role in modulating sensory information acquisition in dolphins.