p-Chloroamphetamine treatment modifies evoked responses to sinusoidal gratings in the pigeon optic tectum

R. Alesci, V. Porciatti, L. Sebastiani, P. Bagnoli

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This study was performed in order to establish whether selective depletion of serotonin (5-HT) and its metabolite 5-hydroxyindoleacetic acid (5-HIAA) in the pigeon optic tectum (TeO) induced by p-chloroamphetamine (p-CA) modified tectal evoked potentials (TEPs). TEPs in response to sinusoidal gratings of different contrast, spatial and temporal frequency were recorded in control pigeons and in pigeons intraperitoneally injected with p-CA (10 mg/kg; two administrations in consecutive days). TEPs of p-CA treated pigeons, as compared to those of control pigeons, were reduced in amplitude as a function of contrast, spatial and temporal frequency. In addition, TEPs of p-CA treated pigeons differed from those recorded in controls in their transfer characteristics of contrast and spatial frequency. In particular, TEPs of p-CA treated pigeons did not saturate at moderate contrast, unlike those of controls. Furthermore, the TEP spatial tuning in p-CA treated pigeons is broader than that in controls; it thus suggests a reduction of spatial-frequency selectivity. These findings indicate that a selective neurotoxin for serotonergic systems, such as p-CA, can serve as a useful denervation tool for the study of the serotonergic function in the pigeon TeO. In addition, selective changes of TEP properties suggest the possibility that serotonergic afferents play a modulatory role on the receptive-field characteristics of tectal neurons.

Original languageEnglish (US)
Pages (from-to)147-152
Number of pages6
JournalVisual neuroscience
Issue number2
StatePublished - Feb 1989
Externally publishedYes


  • Optic tectum
  • Pattern evoked potentials
  • Pigeon
  • Serotonin depletion
  • p-chloroamphetamine

ASJC Scopus subject areas

  • Physiology
  • Sensory Systems


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