synapse_types_delta_impl.h File Reference

implementation of synapse_types.h for a delta decay to synapses. More...

#include <debug.h>
#include <common/neuron-typedefs.h>
#include "synapse_types.h"

Go to the source code of this file.

Data Structures
struct	synapse_types_params_t
struct	synapse_types_t
	Delta synapses support just a single excitatory and inhibitory input each. More...

Macros
#define	SYNAPSE_TYPE_BITS   1
	Number of bits to encode the synapse type.
#define	SYNAPSE_TYPE_COUNT   2
	Number of synapse types.
#define	NUM_EXCITATORY_RECEPTORS   1
	Number of excitatory receptors.
#define	NUM_INHIBITORY_RECEPTORS   1
	Number of inhibitory receptors.

Enumerations
enum	synapse_delta_input_buffer_regions { EXCITATORY , INHIBITORY }
	The supported synapse type indices. More...

Functions
static void	synapse_types_initialise (synapse_types_t *state, synapse_types_params_t *params, uint32_t n_steps_per_timestep)
static void	synapse_types_save_state (synapse_types_t *state, synapse_types_params_t *params)
static void	synapse_types_shape_input (synapse_types_t *parameters)
	decays the stuff thats sitting in the input buffers as these have not yet been processed and applied to the neuron.
static void	synapse_types_add_neuron_input (index_t synapse_type_index, synapse_types_t *parameters, input_t input)
	adds the inputs for a give timer period to a given neuron that is being simulated by this model
static input_t *	synapse_types_get_excitatory_input (input_t *excitatory_response, synapse_types_t *parameters)
	extracts the excitatory input buffers from the buffers available for a given parameter set
static input_t *	synapse_types_get_inhibitory_input (input_t *inhibitory_response, synapse_types_t *parameters)
	extracts the inhibitory input buffers from the buffers available for a given parameter set
static const char *	synapse_types_get_type_char (index_t synapse_type_index)
	returns a human readable character for the type of synapse. examples would be X = excitatory types, I = inhibitory types etc etc.
static void	synapse_types_print_input (synapse_types_t *parameters)
	prints the input for a neuron ID given the available inputs currently only executed when the models are in debug mode, as the prints are controlled from the synapses.c print_inputs() method.
static void	synapse_types_print_parameters (synapse_types_t *parameters)
	printer call

Detailed Description

implementation of synapse_types.h for a delta decay to synapses.

If we have combined excitatory/inhibitory synapses it will be because both excitatory and inhibitory synaptic time-constants (and thus propagators) are identical.

Definition in file synapse_types_delta_impl.h.

---

Data Structure Documentation

synapse_types_params_t

struct synapse_types_params_t

Definition at line 55 of file synapse_types_alpha_impl.h.

Data Fields
alpha_params_t	exc	First excitatory synaptic input.
alpha_params_t	inh	Inhibitory synaptic input
REAL	time_step_ms
input_t	exc
input_t	inh
exp_params_t	exc	First excitatory synaptic input.
exp_params_t	exc2	Second excitatory synaptic input.
exp_params_t	inh	Inhibitory synaptic input
input_t	multiplicator_init	Output scaling factor derived from first excitatory input.
input_t	exc2_old_init	History storage used to reset synaptic state.
input_t	scaling_factor	Scaling factor for the secondary response.
REAL	timestep_ms	The time step in milliseconds.

synapse_types_t

struct synapse_types_t

Delta synapses support just a single excitatory and inhibitory input each.

Definition at line 71 of file synapse_types_alpha_impl.h.

Data Fields
alpha_state_t	exc	Excitatory synaptic input. First excitatory synaptic input.
alpha_state_t	inh	Inhibitory synaptic input. Inhibitory synaptic input
input_t	exc	Excitatory synaptic input.
input_t	inh	Inhibitory synaptic input.
exp_state_t	exc	First excitatory synaptic input. Excitatory synaptic input.
exp_state_t	exc2	Second excitatory synaptic input.
exp_state_t	inh	Inhibitory synaptic input. Inhibitory synaptic input
input_t	multiplicator	Output scaling factor derived from first excitatory input.
input_t	exc2_old	History storage used to reset synaptic state.
input_t	scaling_factor	Scaling factor for the secondary response.

Macro Definition Documentation

SYNAPSE_TYPE_BITS

#define SYNAPSE_TYPE_BITS   1

Number of bits to encode the synapse type.

ceil(log2(SYNAPSE_TYPE_COUNT))

Definition at line 34 of file synapse_types_delta_impl.h.

SYNAPSE_TYPE_COUNT

#define SYNAPSE_TYPE_COUNT   2

Number of synapse types.

NUM_EXCITATORY_RECEPTORS + NUM_INHIBITORY_RECEPTORS

Definition at line 37 of file synapse_types_delta_impl.h.

NUM_EXCITATORY_RECEPTORS

#define NUM_EXCITATORY_RECEPTORS   1

Number of excitatory receptors.

Definition at line 40 of file synapse_types_delta_impl.h.

NUM_INHIBITORY_RECEPTORS

#define NUM_INHIBITORY_RECEPTORS   1

Number of inhibitory receptors.

Definition at line 42 of file synapse_types_delta_impl.h.

Enumeration Type Documentation

synapse_delta_input_buffer_regions

enum synapse_delta_input_buffer_regions

The supported synapse type indices.

Enumerator
EXCITATORY	Excitatory synaptic input.
INHIBITORY	Inhibitory synaptic input.

Definition at line 63 of file synapse_types_delta_impl.h.

Function Documentation

synapse_types_initialise()

static void synapse_types_initialise ( synapse_types_t *  state, synapse_types_params_t *  params, uint32_t  n_steps_per_timestep  )

inlinestatic

Definition at line 72 of file synapse_types_delta_impl.h.

synapse_types_save_state()

static void synapse_types_save_state ( synapse_types_t *  state, synapse_types_params_t *  params  )

static

Definition at line 78 of file synapse_types_delta_impl.h.

synapse_types_shape_input()

static void synapse_types_shape_input ( synapse_types_t *  parameters )

inlinestatic

decays the stuff thats sitting in the input buffers as these have not yet been processed and applied to the neuron.

This is to compensate for the valve behaviour of a synapse in biology (spike goes in, synapse opens, then closes slowly) plus the leaky aspect of a neuron.

Parameters

[in,out]

parameters

the pointer to the parameters to use

Definition at line 91 of file synapse_types_delta_impl.h.

synapse_types_add_neuron_input()

static void synapse_types_add_neuron_input ( index_t  synapse_type_index, synapse_types_t *  parameters, input_t  input  )

inlinestatic

adds the inputs for a give timer period to a given neuron that is being simulated by this model

Parameters

[in]	synapse_type_index	the type of input that this input is to be considered (aka excitatory or inhibitory etc)
[in,out]	parameters	the pointer to the parameters to use
[in]	input	the inputs for that given synapse_type.

Definition at line 103 of file synapse_types_delta_impl.h.

synapse_types_get_excitatory_input()

static input_t * synapse_types_get_excitatory_input ( input_t *  excitatory_response, synapse_types_t *  parameters  )

inlinestatic

extracts the excitatory input buffers from the buffers available for a given parameter set

Parameters

[in,out]	excitatory_response	Buffer to put response in
[in]	parameters	the pointer to the parameters to use

Returns

the excitatory input buffers for a given neuron ID.

Definition at line 121 of file synapse_types_delta_impl.h.

synapse_types_get_inhibitory_input()

static input_t * synapse_types_get_inhibitory_input ( input_t *  inhibitory_response, synapse_types_t *  parameters  )

inlinestatic

extracts the inhibitory input buffers from the buffers available for a given parameter set

Parameters

[in,out]	inhibitory_response	Buffer to put response in
[in]	parameters	the pointer to the parameters to use

Returns

the inhibitory input buffers for a given neuron ID.

Definition at line 132 of file synapse_types_delta_impl.h.

synapse_types_get_type_char()

static const char * synapse_types_get_type_char ( index_t  synapse_type_index )

inlinestatic

returns a human readable character for the type of synapse. examples would be X = excitatory types, I = inhibitory types etc etc.

Parameters

[in]

synapse_type_index

the synapse type index (there is a specific index interpretation in each synapse type)

Returns

a human readable character representing the synapse type.

Definition at line 143 of file synapse_types_delta_impl.h.

synapse_types_print_input()

static void synapse_types_print_input ( synapse_types_t *  parameters )

inlinestatic

prints the input for a neuron ID given the available inputs currently only executed when the models are in debug mode, as the prints are controlled from the synapses.c print_inputs() method.

Parameters

[in]

parameters

the pointer to the parameters to use

Definition at line 160 of file synapse_types_delta_impl.h.

synapse_types_print_parameters()

static void synapse_types_print_parameters ( synapse_types_t *  parameters )

inlinestatic

printer call

Parameters

[in]

parameters

the pointer to the parameters to print

Definition at line 168 of file synapse_types_delta_impl.h.