Biosonar dynamics and spatial attention in an unpredictable virtual localization task

Area of Science:

• Animal behavior
• Sensory neuroscience
• Bioacoustics

Background:

• Echolocating bats navigate complex environments by emitting sound and interpreting returning echoes.
• Understanding how bats process auditory spatial information is crucial for comprehending their foraging strategies.

Purpose of the Study:

• To investigate how big brown bats adjust spatial attention during echo localization.
• To determine the influence of unpredictable target shifts and background clutter on bat echolocation accuracy and behavior.

Main Methods:

• Psychophysical experiments using virtual auditory targets presented via loudspeakers.
• Trained four big brown bats to detect and localize echoes in stationary and shifting conditions.
• Manipulated target unpredictability, peripheral shifts, and weak background clutter.

Main Results:

• Bats were less accurate with peripheral and contralateral target shifts.
• Localization was faster but less precise in the periphery, with a tendency for central acoustic gaze.
• Weak clutter reduced localization accuracy and slowed beam aim adjustment.
• Bats increased echolocation effort (reduced interpulse intervals, more sound groups) when localizing shifted targets, indicating higher perceived difficulty.

Conclusions:

• Spatial attention in echolocating bats is biased towards the center of their acoustic field of view.
• Background clutter significantly impacts echo localization performance and attentional strategies.
• Individual bats exhibit different problem-solving approaches, highlighting behavioral plasticity.