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[Auditory evoked potentials and acoustically-directed behavior of nestlings]
Insights
Auditory evoked potentials (EP) in Pied Flycatcher nestlings show lower thresholds than feeding behavior responses. This suggests a massive sensory inflow is crucial for innate, signal-based behaviors.
Area of Science:
- Neuroscience
- Ornithology
- Bioacoustics
Context:
- Studied auditory evoked potentials (EP) in young Pied Flycatchers (Ficedula hypoleuca).
- Used chronically implanted electrodes in the field L (auditory cortex analogue).
- Recorded EPs and behavior in naturalistic conditions.
Purpose:
- Investigate auditory evoked potential (EP) characteristics in nestling birds.
- Determine the relationship between EP generation thresholds and feeding behavior.
- Understand the neural basis of innate auditory processing.
Summary:
- EP generation thresholds were measured in response to feeding calls and pure tones.
- EP thresholds were found to be independent of factors influencing feeding behavior organization.
- EP generation thresholds were significantly lower (13-36 dB) than feeding response thresholds in highly motivated nestlings.
Impact:
- Suggests that innate, signal-based behaviors require more than sensory input integration.
- Highlights the necessity of massive, modality-specific sensory inflow for realizing inborn behaviors.
- Provides insights into auditory processing and neural mechanisms underlying behavior in developing birds.
Abstract:
Characteristics of auditory evoked potentials (EP) were studied in 1.5 to 7.5 days old Pied Flycatchers nestlings (Ficedula hypoleuca) with chronically implanted electrodes in the field L (analogue of the mammal's auditory cortex). EPs simultaneously with behaviour were recorded in nestlings under conditions similar to natural, in response to "feeding" calls and pure tones of different frequency and intensity. It was found that EP generation thresholds do not depend on the sum total of factors which influence the organization of feeding behaviour. The EP generation threshold is by 13-36 dB (for different frequencies) below that of the appearance of feeding responses in nestling with a maximum high motivation. It is suggested that the realization of inborn behaviour with a signal basis needs not only an integration (formed in the process of embryogenesis) of a definite sensory input with a complex of structures of the "feeding centre", but also the presence of a massive modality-specific inflow.