GryllidaeGymnotiformesFertile PeriodVocalization, AnimalSound SpectrographyElectric FishEvoked Potentials, Auditory, Brain StemTransducersSingingAcousticsAcoustic StimulationAuditory ThresholdElectric OrganAudiometry, Pure-ToneSignal Processing, Computer-AssistedAuditory PathwaysHearingUltrasonicsMicrobubblesCochlear NerveEquipment DesignPhantoms, ImagingSexual Behavior, AnimalAuditory PerceptionReaction TimeNoiseUltrasonographyFourier AnalysisCochleaBirdsImage Interpretation, Computer-AssistedInterneuronsImage EnhancementSex CharacteristicsAction PotentialsTime FactorsNeurons