[Visual deprivation affects the development of auditory sensitivity during the period of maturation of freezing response in pied flycatcher nestlings].
Recording of evoked potentials (EP) from the higher auditory center of birds field L of the nidopallium was used to study the development of the auditory sensitivity in normally developing vs visually deprived pied flycatcher nestlings aged 6-9 days. The visual deprivation was shown to induce a significant decrease in the absolute auditory EP thresholds in the frequency range of species-typical food call (1-3 kHz) during the period corresponding to the time of the vision involvement into the feeding behavior in the normal young (6 days post-hatching). In the frequency range of species-typical alarm call (4-5 kHz), EP thresholds in visually deprived nestlings were significantly lower than in the control birds during the period corresponding to the time of the vision involvement into the defense behavior of the latter (8-9 days post-hatching). With account made for the previous data demonstrating the decrease of efficiency of acoustic signals provoking freezing in visually-deprived nestlings, it is reasonable to suggest that defense behavior develops not just as a response to alarm call or imitating tone pips, but as a whole system, whose norma maturation and functioning requires integration of numerous factors visual afferentation being one of them.
Korneeva
E V
EV
Aleksandrov
L I
LI
Golubeva
T B
TB
Raevskiĭ
V V
VV
D000161:Acoustic Stimulation / Q000379:methods; D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D009425:Nesting Behavior / Q000502:physiology*; D046109:Passeriformes / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*