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Directional responses to sounds in young gerbils (Meriones unguiculatus)
Insights
Infant gerbils show an ability to approach auditory stimuli, particularly social calls. This sound localization ability develops around 16-19 days and relies on binaural cues.
Area of Science:
- Animal Behavior
- Auditory Neuroscience
- Developmental Psychology
Background:
- Auditory perception and sound localization are critical for survival in many species.
- Understanding the developmental trajectory of auditory processing in altricial mammals like gerbils provides insights into sensory development.
Purpose of the Study:
- To investigate the auditory approach behavior in infant gerbils.
- To determine the age at which gerbils develop auditory localization abilities.
- To examine the role of binaural cues in sound localization.
Main Methods:
- Gerbil pups (12-27 days old) were tested in a circular arena with a movable sound source.
- Auditory stimuli included social calls and white noise at varying intensities.
- Binaural cue importance was assessed using ear blocks.
Main Results:
- Gerbils showed a significant approach response to low-intensity social calls and white noise.
- Auditory approach behavior emerged between 16-19 days of age.
- Sound localization was impaired by unilateral ear obstruction, highlighting the importance of binaural balance.
Conclusions:
- Infant gerbils demonstrate an innate ability to approach auditory stimuli, with a preference for social calls.
- The development of sound localization in gerbils is age-dependent and emerges in the third postnatal week.
- Binaural processing is crucial for accurate sound localization in young gerbils.
Abstract:
Three experiments were conducted to determine the ability of infant gerbils to approach an auditory stimulus. In the first experiment, gerbil pups, 16-23 days of age, were tested in a circular apparatus with a central start area and a movable sound source located at one of eight positions around the perimeter. Stimuli included high- and low-intensity presentations of a tape-recorded gerbil social call, a broad-band white noise stimulus, and a no-stimulus control condition. The subjects showed a strong tendency to approach the low-intensity social call and a less pronounced tendency to approach the white noise. In the second experiment, gerbil pups were tested in the same apparatus with or without ear blocks to determine the role of binaural cues in directional approach responding. The tendency to approach a low-intensity vocalization was disrupted by obstruction of one ear but not by blocking both ears. Thus, binaural balance was shown to be important for early sound localization. In the third experiment, the tendency to approach a social call was compared at different ages, 12-15, 16-19, 20-23, and 24-27 days after birth. Approach responses were first seen at 16-19 days. The responses continued during the 20-23-day period but began to wane at 24-27 days of age.