Temporal population code of concurrent vocal signals in the auditory midbrain.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol
; 187(11): 865-73, 2001 Dec.
Article
de En
| MEDLINE
| ID: mdl-11866185
ABSTRACT
Unique patterns of spike activity across neuron populations have been implicated in the coding of complex sensory stimuli. Delineating the patterns of neural activity in response to varying stimulus parameters and their relationships to the tuning characteristics of individual neurons is essential to ascertaining the nature of population coding within the brain. Here, we address these points in the midbrain coding of concurrent vocal signals of a sound-producing fish, the plainfin midshipman. Midshipman produce multiharmonic vocalizations which frequently overlap to produce beats. We used multivariate statistical analysis from single-unit recordings across multiple animals to assess the presence of a temporal population code. Our results show that distinct patterns of temporal activity emerge among midbrain neurons in response to concurrent signals that vary in their difference frequency. These patterns can serve to code beat difference frequencies. The patterns directly result from the differential temporal coding of difference frequency by individual neurons. Difference frequency encoding, based on temporal patterns of activity, could permit the segregation of concurrent vocal signals on time scales shorter than codes requiring averaging. Given the ubiquity across vertebrates of auditory midbrain tuning to the temporal structure of acoustic signals, a similar temporal population code is likely present in other species.
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Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Voies auditives
/
Vocalisation animale
/
Mésencéphale
/
Poissons
Limites:
Animals
Langue:
En
Journal:
J Comp Physiol A Neuroethol Sens Neural Behav Physiol
Sujet du journal:
CIENCIAS DO COMPORTAMENTO
/
FISIOLOGIA
/
NEUROLOGIA
Année:
2001
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique