Why do different types of swimmeret motor neurons have such similar integrative properties?
Swimmeret motor neurons that are active in different phases of the motor pattern, and those that have different peripheral functions, nonetheless are similar in their Rins and ms (Table 1). These similarities imply that they integrate synaptic currents in similar ways. Because measured values of ms in other types of neurons range from <2 ms to >1,000 ms (Hille 1992), and other motor neurons in these same ganglia have significantly different time constants that affect their performance (Edwards and Mulloney 1987), the narrow ranges of these parameters observed in these swimmeret neurons suggest that some requirement of the system has selected for a narrow window of passive properties, despite difference in the neurons’ peripheral targets and functions. The function common to all swimmeret motor neurons is to transform periodic synaptic currents from the premotor pattern-generating module into bursts of impulses that will trigger effective movements of the required period and power. Peri
Swimmeret motor neurons that are active in different phases of the motor pattern, and those that have different peripheral functions, nonetheless are similar in their R ins and τms (Table 1). These similarities imply that they integrate synaptic currents in similar ways. Because measured values of τms in other types of neurons range from <2 ms to >1,000 ms (Hille 1992), and other motor neurons in these same ganglia have significantly different time constants that affect their performance (Edwards and Mulloney 1987), the narrow ranges of these parameters observed in these swimmeret neurons suggest that some requirement of the system has selected for a narrow window of passive properties, despite difference in the neurons’ peripheral targets and functions. The function common to all swimmeret motor neurons is to transform periodic synaptic currents from the premotor pattern-generating module into bursts of impulses that will trigger effective movements of the required period and power. P
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