Summary
Evoked potentials were recorded from the nucleus basalis prosencephali (Bas) of the pigeon through chronically implanted electrodes. The auditory sensitivity of the Bas was assessed by the amplitude of the potentials. Audiograms thus obtained were comparable to those similarly measured from stations of the orthodox auditory pathway and resembled those obtained by others with behavioural techniques from the same species. The sensitivity to vibration applied to the beak was also measured. The vibrogram revealed two separate optima, one located in the lower frequency and another in the higher frequency region. These were shown to be due to trigeminal mechanoreceptive sensitivity and to bone/cochlea mediated sound sensitivity, respectively. Evoked potentials of the Bas in response to vestibular stimulation are described for the first time. The possibility that they were artefacts was excluded with several control procedures. These findings confirm recent anatomical evidence of a direct pathway from the vestibular nucleus to the nucleus basalis prosencephali. All afferents to the Bas are discussed in conjunction with the probable function of the nucleus as a sensorimotor coordinator of the pigeon's pecking/feeding behaviour.
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Abbreviations
- A :
-
archistriatum
- aL :
-
area L of the medial neostriatum caudale
- Bas :
-
nucleus basalis prosencephali
- Cb :
-
cerebellum
- FA :
-
tractus fronto-archistriatalis
- HA :
-
hyperstriatum accessorium
- Hp :
-
hippocampus
- HRP :
-
horseradish peroxidase
- HV :
-
hyperstriatum ventrale
- LLv :
-
nucleus lemnisci lateralis, pars ventralis
- LPO :
-
lobus parolfactorius
- MV :
-
nucleus motorius nervi trigemini
- MLd :
-
nucleus mesencephalicus lateralis, pars dorsalis
- nVI :
-
nucleus nervi facialis
- nVIII :
-
nervus vestibulocochlearis
- N :
-
neostriatum
- NFL :
-
neostriatum frontolaterale
- OM :
-
tractus occipitomesencephalicus
- Ov :
-
nucleus ovoidalis
- PrV :
-
nucleus sensorius principalis nervi trigemini
- QF :
-
tractus quintofrontalis
- Rpv :
-
nucleus reticularis parvocellularis, pars lateralis
- TrO :
-
tractus opticus
- VS :
-
nucleus vestibularis superior
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Schall, U., Delius, J.D. Sensory inputs to the nucleus basalis prosencephali, a feeding-pecking centre in the pigeon. J. Comp. Physiol. 159, 33–41 (1986). https://doi.org/10.1007/BF00612493
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DOI: https://doi.org/10.1007/BF00612493