"Whistle" - what is it, definition of the term
A compact acoustic device that generates a sharp, high‑frequency tone, typically used to produce an audible signal that can trigger startle or conditioning responses in laboratory rodents such as rats and mice.
Detailed information
Audible signaling devices designed for rodent studies serve multiple functions: behavior conditioning, population monitoring, and trap activation. Their construction typically involves a metal or plastic resonator, a mouthpiece, and a diaphragm that vibrates when air passes through, producing a high‑frequency tone. The tone’s pitch ranges from 2 kHz to 8 kHz, overlapping the hearing sensitivity of common laboratory rats and house mice.
Key characteristics influencing effectiveness:
- Frequency selection: Aligns with species‑specific auditory thresholds; higher frequencies reduce interference from ambient noise.
- Amplitude control: Adjustable volume ensures the signal is detectable without causing distress.
- Durability: Materials resistant to corrosion and repeated use extend service life.
- Portability: Compact design facilitates field deployment and laboratory integration.
Applications in research and pest management include:
- Operant conditioning: Pairing the tone with food rewards shapes desired responses in maze experiments.
- Alert systems: Integrating the device with motion sensors triggers the sound when rodents breach a defined zone, prompting immediate observation.
- Trap luring: Emitting the signal near baited traps increases capture rates by exploiting the animals’ curiosity and territorial behavior.
- Population surveys: Recording vocalizations in response to the signal aids in estimating density and activity patterns.
Maintenance protocols recommend cleaning the resonator after each session to prevent residue buildup, inspecting the diaphragm for fatigue, and calibrating frequency output with a sound level meter quarterly. Proper storage in a dry environment preserves acoustic integrity.
When selecting a model, prioritize adjustable frequency range, robust construction, and compatibility with existing monitoring equipment. This ensures reliable performance across varied experimental conditions and field scenarios.