American Crow Brain Activity in Response to Conspecific Vocalizations Changes When Food Is Present

Area of Science:

• Neuroscience
• Ethology
• Avian Biology

Background:

• Social interactions are crucial in animal behavior, particularly during foraging.
• Understanding avian brain regions involved in social interaction is limited, especially concerning multimodal sensory input.

Purpose of the Study:

• To investigate American crow brain activity during communal feeding contexts.
• To identify brain regions responding to unimodal and multimodal social stimuli.

Main Methods:

• Utilized 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) in American crows (Corvus brachyrhynchos).
• Exposed crows to visual (food sight), auditory (conspecific vocalizations), and combined audio-visual stimuli, compared to a control.
• Analyzed brain activity patterns in response to different sensory conditions.

Main Results:

• The nucleus taenia of the amygdala (TnA) and medial caudal nidopallium showed increased activity with multimodal stimuli only.
• The lateral septum and medial nidopallium responded to both audio-only and combined audio-visual stimuli.
• No significant brain activity differences were observed for the visual stimulus alone.

Conclusions:

• Specific brain regions, TnA and medial caudal nidopallium, are involved in processing multimodal social cues in crows.
• The lateral septum and nidopallium play a role in responding to auditory and combined social stimuli.
• These findings advance our understanding of avian neurobiology and social behavior processing.