The Central Path of the Light Reflex

Pupil dilatation and dark adaptation.

“…The most probable explanation of our results is in terms of changes in the constrictor center of the oculomotor nucleus, or perhaps in the pretectal region, the locus of the first synaptic juncture of the light reflex pathway in the brain (Magoun and Ranson,22). When the retina is stimulated by a constant intensity, as in preadaptation, the constrictor center presumably is subject to a constant state of excitation.…”

Pupil dilatation and dark adaptation.

“…The most probable explanation of our results is in terms of changes in the constrictor center of the oculomotor nucleus, or perhaps in the pretectal region, the locus of the first synaptic juncture of the light reflex pathway in the brain (Magoun and Ranson,22). When the retina is stimulated by a constant intensity, as in preadaptation, the constrictor center presumably is subject to a constant state of excitation.…”

Autonomic Control of the Eye

“…It was soon shown that the central afferent limb of the reflex began with retinal ganglion cell fibers and includes the brachium of the superior colliculus (179). However, the site of termination of these fibers and their subsequent projections remained unclear until the studies of Magoun and colleagues (224)(225)(226)304). These experimenters used localized stimulation and lesioning techniques to follow the trajectory of the reflex pathway and showed for the first time that the pretectum is essential for the integrity of the PLR.…”

Visual pattern perception following subpial slicing and tantalum wire implantations in the visual cortex.

“…One month after the second operation the highest figures on which criterion had been attained were A2, E2, C1, El, 1)4, and Fl. The pupils remained widely dilated after the second operation indicating damage to the prelectal nuclei (6). Impairment of the mechanisms for focusing may thus have been a complicating factor.…”

Pupil dilatation and dark adaptation.

“…The most probable explanation of our results is in terms of changes in the constrictor center of the oculomotor nucleus, or perhaps in the pretectal region, the locus of the first synaptic juncture of the light reflex pathway in the brain (Magoun and Ranson,22). When the retina is stimulated by a constant intensity, as in preadaptation, the constrictor center presumably is subject to a constant state of excitation.…”

Autonomic Control of the Eye

“…It was soon shown that the central afferent limb of the reflex began with retinal ganglion cell fibers and includes the brachium of the superior colliculus (179). However, the site of termination of these fibers and their subsequent projections remained unclear until the studies of Magoun and colleagues (224)(225)(226)304). These experimenters used localized stimulation and lesioning techniques to follow the trajectory of the reflex pathway and showed for the first time that the pretectum is essential for the integrity of the PLR.…”

Visual pattern perception following subpial slicing and tantalum wire implantations in the visual cortex.

“…One month after the second operation the highest figures on which criterion had been attained were A2, E2, C1, El, 1)4, and Fl. The pupils remained widely dilated after the second operation indicating damage to the prelectal nuclei (6). Impairment of the mechanisms for focusing may thus have been a complicating factor.…”

Pupil dilatation and dark adaptation.

“…The most probable explanation of our results is in terms of changes in the constrictor center of the oculomotor nucleus, or perhaps in the pretectal region, the locus of the first synaptic juncture of the light reflex pathway in the brain (Magoun and Ranson,22). When the retina is stimulated by a constant intensity, as in preadaptation, the constrictor center presumably is subject to a constant state of excitation.…”

Autonomic Control of the Eye

“…It was soon shown that the central afferent limb of the reflex began with retinal ganglion cell fibers and includes the brachium of the superior colliculus (179). However, the site of termination of these fibers and their subsequent projections remained unclear until the studies of Magoun and colleagues (224)(225)(226)304). These experimenters used localized stimulation and lesioning techniques to follow the trajectory of the reflex pathway and showed for the first time that the pretectum is essential for the integrity of the PLR.…”

Visual pattern perception following subpial slicing and tantalum wire implantations in the visual cortex.

“…One month after the second operation the highest figures on which criterion had been attained were A2, E2, C1, El, 1)4, and Fl. The pupils remained widely dilated after the second operation indicating damage to the prelectal nuclei (6). Impairment of the mechanisms for focusing may thus have been a complicating factor.…”