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• W2000936960 abstract "Summary The purpose of the present study was to determine the extent to which stimulation of the mesencephalic reticular formation (MRF) has similar effects on LGN transmission as spontaneous saccadic eye movements (SEMs). The experiments were performed in unanesthetized ‘encephale isole’ preparations. Stimulation electrodes were placed in the optic chiasm (OX), the homolateral MRF and the homolateral optic radiation (OR). Changes of LGN transmission were determined by the amplitude variations of cortical evoked potentials (EPs) in are 17 (VC) to OX stimulation and by extracellularly recorded LGN unit activity. MRF stimulation elicits a negative field potential in LGN and VC and a conjugate SEM to the contralateral side. With MRF stimulation field potential and SEM have approximately the same latency between 40 and 60 msec from stimulus onset. With spontaneous SEMs a similar field potential occurs in LGN and VC but it starts with a delay of 50–100 msec from saccade onset. In both conditions the cortical EP to OX stimulation is enhanced when the OX shock coincides with the field potential. Even when the short latency components (shorter than 2.4 msec) of the EP remain unchanged, the early components of the EP to a second OX shock (given 15 msec after the first) are consistently enhanced. Most of those relay cells which respond with increased firing to MRF stimulation are also facilitated during the field potential associated with SEMs. There was no noticeable difference between on- and off-center units. Three cells which were orthodromically activated both from OX and OR were inhibited by MRF stimulation and SEMs. The high degree of similarity between the effect of MRF stimulation and SEMs on EPs and single unit activity suggests that SEMs are associated with corollary activity which causes transient disinhibition in the LGN. Because of its delayed onset and its facilitatory effect the corollary activity associated with the monophasic field potentials cannot be the cause for ‘saccadic suppression’. The hypothesis is put forward that saccade contigent corollary activity serves to broaden the bandpass of geniculo-cortical channels and to clear the LGN from postsynaptic inhibition which is generated by moving contrasts during the saccade. Thus each change of the fixation point would be associated with a resetting of the thalamic relay." @default.
• W2000936960 created "2016-06-24" @default.
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• W2000936960 date "1974-06-01" @default.
• W2000936960 modified "2023-09-27" @default.
• W2000936960 title "Correlation between the effects of brain stem stimulation and saccadic eye movements on transmission in the cat lateral geniculate nucleus" @default.
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• W2000936960 doi "https://doi.org/10.1016/0006-8993(74)90858-0" @default.
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