A large number of parosal and midget bipolar retinal ganglions are known to fire synchronously in a highly correlated manner during visual activity\cite{brivanlou}. Primate studies show that multiple parosal bipolar ganglions which feed the magnocellular pathway, fire synchronously within a time frame of about 10 ms and multiple midget bipolar ganglions which feed the parvocellular pathway, fire synchronously within a time frame of about 50 ms \cite{greschner}. These firing behaviour of the neurons are related to the involuntary ballistic eye movements known as saccades which occur in a time frame of about 30 ms\cite{stein1999}. Since normal saccades repeat every 30 ms, which is larger than the time span of the synchronous activity of the parosal bipolar ganglions, saccades would set a lower bound to the temporal frequency perception in the magnocellular pathway. However, the parvocellular pathway which only fires every 50 ms will be unaffected by the saccades of normal readers as shown in various studies \cite{stein2001}. This behaviour of the two pathways have been observed through flicker studies\cite{merigan1993} and other studies have shown that the magnocellular rather than the parvocellular pathway is selectively suppressed during saccades. In this paper, we have shown how the interplay of saccades and correlated firing of retinal ganglions affect the neural signals in the magnocellular and parvocellular pathway.
We show that that the correlated behaviour is related to the ability of the magnocellular pathway but not the parvocellular pathway to respond to eye saccades.
These observations are consistent with our findings.
This also ensures that at least three temporal events of a visual scene is stably recorded in the time frame of a saccade. In a single span of an eye saccade, the magnocellular pathway will receive three bins of 10 ms neural signals due to the correlated firing mechanism. This restricts the temporal frequency resolution giving a lower limit of