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Fig. 8 | SpringerPlus

Fig. 8

From: A framework for the first-person internal sensation of visual perception in mammals and a comparable circuitry for olfactory perception in Drosophila

Fig. 8

Diagrams of the right eye and its connections demonstrating pressure phosphene formation. a Right eye and its connections to the visual cortex viewed from above. It shows visual stimuli entering the eyeball and activating the retina. The activation then continues through the optic nerve towards the higher neuronal orders. For simplicity, crossing of the optic nerve fibers at the optic chiasm is not shown. At the synapses of the lateral geniculate nucleus (LGN) neurons with the cortical neurons, inter-postsynaptic functional LINKs are reactivated. Additional functional LINKs will be activated at higher neuronal orders for perception of more complex sensory features of the object. b View of the right eye from above, showing the formation of pressure phosphenes from stimulating the horizontal cells through lateral pressure over the eyeball. The procedure of application of gentle pressure over the eyeball is carried out in the dark. The phosphene is perceived when looking medially and upwards while applying gentle pressure over the lateral side of the eyeball. This activates a non-specific set of horizontal cells. As the activity pass through higher neuronal orders, a large number of inter-postsynaptic functional LINKs gets reactivated, activating the LINKed postsynapses and resulting in the formation of perceptons as a systems property. The net perceptons result in the internal sensation of the phosphene. The broken arrow shows the direction of the formation of the semblances. The oscillating patterns of neuronal activity is represented by the wave form

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