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  • 1
    Electronic Resource
    Electronic Resource
    Low threshold motor effects produced by stimulation of area preinsularis (2pr.i) of the secondary sensory cortex in the cat; Input-output relationships (1983)
    Springer
    Experimental brain research 51 (1983), S. 108-116 
    Details
    ISSN: 1432-1106
    Keywords: Sensory cortex ; Motor effects ; ICMS ; Area 2 pr.i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary (1) Intracortical microstimulation (ICMS) delivered to area 2 preinsularis (area 2 pr. i) of the second somatosensory cortex, SII, elicited contralateral distal limb movements with threshold currents as low as 2 μA. (2) The effective sites for a particular movement were located in a small area within the depth of the cortex extending along the direction of the radial fibers. (3) Neurons in an area for a particular movement generally received peripheral input from the skin overlying the muscle to which the area projected. (4) ICMS in area 2 pr.i produced powerful monosynaptic as well as disynaptic activation of pyramidal tract neurons, suggesting that the effect was mediated by the pyramidal tract. (5) Ablation of the motor cortex did not eliminate or otherwise reduce the low threshold responses from area 2 pr.i suggesting that the described effect is independent of the motor cortex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236808
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Movement of facial muscles following intra-cortical microstimulation (ICMS) along the lateral branch of the posterior bank of the ansate sulcus, areas 5a and 5b, in the cat (1983)
    Springer
    Experimental brain research 50 (1983), S. 459-463 
    Details
    ISSN: 1432-1106
    Keywords: Parietal cortex ; Ansate sulcus ; Facial muscles ; ICMS ; Cats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The lateral branch of the posterior bank of the ansate sulcus within the parietal cortex, areas 5a and 5b, was mapped using intracortical microstimulation (ICMS). Motor effective sites for contraction of facial muscles were identified using ICMS currents of less than 30 μA. Of the 177 effective sites, 78% were activated with threshold currents of less than 20 μA, and of these, 33% responded to stimulus strengths of less than 10 μA. Since neurons in this portion of the ansate region send projections to the face region of motor cortex, area 4γ, the possibility existed that the motor effects might be mediated through area 4γ. To examine this possibility we ablated both the anterior sigmoid gyrus (ASG) and the second somatosensory cortex, SII, including area 2pri, a region shown to contain a low threshold motor component, and report that the motor effect recorded from the ansate region is independent of both the ASG and area 2pri.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239213
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    Paper (German National Licenses)
    Fulltext
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