Unit activity in the superior colliculus after removal of corticofugal control

1978 ◽  
Vol 10 (1) ◽  
pp. 40-46
Author(s):  
V. L. Silakov ◽  
Z. S. Khanaeva
Keyword(s):  
Superior Colliculus ◽  
Unit Activity

Unit activity in the superior colliculus of the cat following passive eye movements

1979 ◽  
Vol 57 (4) ◽  
pp. 359-368 ◽  
Author(s):  
V. C. Abrahams ◽  
G. Anstee
Keyword(s):  
Eye Movements ◽  
Superior Colliculus ◽  
Unit Activity ◽  
Initial Position ◽  
Passive Movement ◽  
Unit Response ◽  
Deep Layers ◽  
Saccadic Velocity ◽  
Facial Area ◽  
Low Threshold

Unit response in the superior colliculus and underlying structures has been examined in the chloralose-anaesthetized cat following passive movement of an occluded eye. One group of units was sensitive to small saccadic movements, responded regardless of the initial position of the eye, and in most instances responded to movements in opposite directions. A second numerically smaller group also responded when the eye was moved at saccadic velocity but only when the eye passed a fixed point. Such units with fixed positional thresholds were found following movements in both nasal and temporal directions as well as to both upward and downward movement. Both types of unit response were found after transection of the optic nerve and were also recorded when individual extraocular muscles were subjected to controlled stretch, It is assumed that most unit activity seen after passive movement of the occluded eye is due to activity in extraocular muscle receptors. In the deep layers of the superior colliculus responses to small eye movements were found to be due to the activation of very low threshold receptors sensitive to vibration in the facial area.

Single unit activity in the rat superior colliculus during reward magnitude task performance.

2008 ◽  
Vol 122 (1) ◽  
pp. 183-190 ◽  
Author(s):  
Douglas A. Weldon ◽  
Carlyn A. Patterson ◽  
Erica A. Colligan ◽  
Christina L. Nemeth ◽  
Avery A. Rizio
Keyword(s):  
Superior Colliculus ◽  
Task Performance ◽  
Reward Magnitude ◽  
Unit Activity ◽  
Single Unit ◽  
Single Unit Activity

Ultrastructure of developing visual cortical synapses in the cat superior colliculus

1991 ◽  
Vol 49 ◽  
pp. 156-157
Author(s):  
Caroline A. Miller ◽  
Laura L. Bruce
Keyword(s):  
Superior Colliculus ◽  
Phosphate Buffer ◽  
Receptive Fields ◽  
Visual Cortical Area ◽  
Cortical Synapses ◽  
Visual Cortical ◽  
And Function ◽  
Phosphate Buffered Saline ◽  
The Brain ◽  
Cat Superior Colliculus

The first visual cortical axons arrive in the cat superior colliculus by the time of birth. Adultlike receptive fields develop slowly over several weeks following birth. The developing cortical axons go through a sequence of changes before acquiring their adultlike morphology and function. To determine how these axons interact with neurons in the colliculus, cortico-collicular axons were labeled with biocytin (an anterograde neuronal tracer) and studied with electron microscopy.Deeply anesthetized animals received 200-500 nl injections of biocytin (Sigma; 5% in phosphate buffer) in the lateral suprasylvian visual cortical area. After a 24 hr survival time, the animals were deeply anesthetized and perfused with 0.9% phosphate buffered saline followed by fixation with a solution of 1.25% glutaraldehyde and 1.0% paraformaldehyde in 0.1M phosphate buffer. The brain was sectioned transversely on a vibratome at 50 μm. The tissue was processed immediately to visualize the biocytin.

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