spike

type ActParams struct {
	leabra.ActParams

	// spiking parameters
	Spike SpikeParams `display:"inline"`
}

type SpikeParams struct {

	// if true, turn on exponential excitatory current that drives Vm rapidly upward for spiking as it gets past its nominal firing threshold (Thr) -- nicely captures the Hodgkin Huxley dynamics of Na and K channels -- uses Brette & Gurstner 2005 AdEx formulation -- this mechanism has an unfortunate interaction with the continuous inhibitory currents generated by the standard FFFB inhibitory function, which cause this mechanism to desensitize and fail to spike
	Exp bool `default:"false"`

	// slope in Vm (2 mV = .02 in normalized units) for extra exponential excitatory current that drives Vm rapidly upward for spiking as it gets past its nominal firing threshold (Thr) -- nicely captures the Hodgkin Huxley dynamics of Na and K channels -- uses Brette & Gurstner 2005 AdEx formulation -- a value of 0 disables this mechanism
	ExpSlope float32 `default:"0.02"`

	// membrane potential threshold for actually triggering a spike when using the exponential mechanism
	ExpThr float32 `default:"1.2"`

	// post-spiking membrane potential to reset to, produces refractory effect if lower than VmInit -- 0.30 is appropriate biologically based value for AdEx (Brette & Gurstner, 2005) parameters
	VmR float32 `default:"0.3,0,0.15"`

	// post-spiking explicit refractory period, in cycles -- prevents Vm updating for this number of cycles post firing
	Tr int `default:"3"`

	// for translating spiking interval (rate) into rate-code activation equivalent (and vice-versa, for clamped layers), what is the maximum firing rate associated with a maximum activation value (max act is typically 1.0 -- depends on act_range)
	MaxHz float32 `default:"180" min:"1"`

	// constant for integrating the spiking interval in estimating spiking rate
	RateTau float32 `default:"5" min:"1"`

	// rate = 1 / tau
	RateDt float32 `display:"-"`
}