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. 2011 Sep 13;22(7):1614–1621. doi: 10.1093/cercor/bhr233

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© The Authors 2011. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — Familiar configurations of pictures displayed on a computer screen do not facilitate LTD. Animals were stationary and alert in the recording chamber. The left eye viewed a computer screen that could not be seen by the right eye, and vice versa. Reexposure to the same configuration of pictures (familiar pictures) did not facilitate LTD in CA1 in either the hippocampus ipsilateral to the stimulating electrode (a) or the contralateral hippocampus (b). In the next experiment, the same (familiar) pictures were displayed, in the same configuration as beforehand, to the eye that projects to the contralateral hemisphere (right eye, “3rd exposure”) whereas the eye that projects to the ipsilateral hemisphere (left eye, a) was shown a new configuration of the familiar images (“novel configuration”). This resulted in a facilitation of LTD in the ipsilateral hemisphere (a), whereas in the contralateral CA1 (b), no difference in the magnitude and duration of plasticity elicited was seen compared with STD elicited by LFS under control (blank screen) conditions.