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Directional sensitivity to local stimuli by retinal ganglion cells are related to processes which probably are located at the Inner Plexiform Layer of the retina, at the ganglion cells dendrites and it is the result of at least two mechanisms. First, at the ganglion dendrites, either by postsynaptic inhibition from amacrines or by presynaptic inhibition of bipolar synapses, also by amacrines. Second, there seems to be an “intrinsic” amacrine directionality by the so called “starbust” amacrines which is itself emphasized by amacrine-amacrine interaction and then transmitted, by inhibition, to presynaptic ganglia connections [1], [2], [3].
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de Blasio, G., Moreno-Díaz, R., Moreno-Díaz, R. (2009). Analytical Representation of Intrinsic Directionality in Retinal Cells. In: Moreno-Díaz, R., Pichler, F., Quesada-Arencibia, A. (eds) Computer Aided Systems Theory - EUROCAST 2009. EUROCAST 2009. Lecture Notes in Computer Science, vol 5717. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04772-5_5
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