June 2007
Volume 7, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2007
The effects of a cholinergic deficit on visual learning in rats
Author Affiliations
  • Alexandre Ben Amor
    School of Optometry, Université de Montréal
  • Elvire Vaucher
    School of Optometry, Université de Montréal
Journal of Vision June 2007, Vol.7, 229. doi:10.1167/7.9.229
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      Alexandre Ben Amor, Elvire Vaucher; The effects of a cholinergic deficit on visual learning in rats. Journal of Vision 2007;7(9):229. doi: 10.1167/7.9.229.

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Abstract

The cholinergic system participates in the continual reorganization of the cortical sensory map. During patterned visual stimulation, acetylcholine is released in the primary visual cortex (V1) and a deficit of this neurotransmitter diminishes neuronal activity of this area. Here, we evaluated if an acetylcholine deficit affects perceptual learning capacity of rats performing a visual discrimination task.

Rats were trained in a visual water maze to determine visual acuity (Prusky et al., 2000). Subjects were then divided into two groups whereby one group received intra-ventricular injections of 192 IgG-saporin in order to lesion the cholinergic fibers and a sham lesion group. After 21 days post-surgery, rats were tested for recall of the visual acuity task and learned an orientation task modified to the water maze. In the orientation task, animals learned to discriminate between a 90° stimulus (reference pattern) and one that varied between 45° and 90°. An 80% success rate was used to define successful learning of the task. Immunostaining of cholinergic fibres in V1 and basal forebrain showed a complete loss of cholinergic innervation of V1. The visual acuity of the lesioned and the sham-operated rats did not differ from pre-surgery levels. The ability of the lesioned group to learn the orientation task was significantly lower than the sham-operated group (p=0.015). More trials were necessary for the lesioned group to be able to discriminate between a 75° vs 90° pattern compared to control animals (73 ± 8 and 42 ± 6, respectively). These results suggest that a deficit in acetylcholine may cause a deficit in visual learning.

Amor, A. B. Vaucher, E. (2007). The effects of a cholinergic deficit on visual learning in rats [Abstract]. Journal of Vision, 7(9):229, 229a, http://journalofvision.org/7/9/229/, doi:10.1167/7.9.229. [CrossRef]
Footnotes
 Dr. Mark Burk, Canadian Institute of Health Research, School of Optometry - Université de Montréal.
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