Based on the above directional test data, it was indicated that the Acoustic Startle Reflex signal does not increase the stress of the exposed birds and the additional stress hormone release due to the ASR signal exposure approaches zero.
On the other hand, the practice of using predator sounds for activities such as bird deflection appears to have two downfalls. First, initially it stresses the birds, potentially affecting their breeding, feeding or sheltering behavior, while after repeated exposure they completely get accustomed to the sound.