139 lines
4.2 KiB
Lua
139 lines
4.2 KiB
Lua
-- This Lua script sends Stimulations to the speller visualization box for a tactile p300-System with 6 stimulators
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--
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-- Author : Tobias Baumann
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-- Date : 2021-12-06
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-- Revised: 2021-19-11
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--This function lets the box sleep until a fixed moment
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function wait_until(box, time)
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while box:get_current_time() < time do
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box:sleep()
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end
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end
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--This function lets the box wait for a fixed duration
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function wait_for(box, duration)
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wait_until(box, box:get_current_time() + duration)
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end
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--this function checks, wether value already is an element of the given stim_matrix
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function is_element(matrix, value)
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for i = 1, #matrix do
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if #matrix == 0 then
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return(false)
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elseif value == matrix[i] then
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return(true)
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end
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end
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return(false)
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end
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--this function creates a sequence of stimulations by shuffeling the values of the given stim_matrix
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function create_sequence(matrix)
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math.randomseed(os.time())
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local stim_matrix = {}
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local stim_code = 0
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local i = 1
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while i <= #matrix do
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stim_code = matrix[math.random(1,#matrix)]
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if is_element(stim_matrix, stim_code) == false then
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stim_matrix[i] = stim_code
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i = i + 1
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end
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end
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return(stim_matrix)
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end
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-- this function is called when the box is initialized
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function initialize(box)
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--load stimulation codes
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dofile(box:get_config("${Path_Data}") .. "/plugins/stimulation/lua-stimulator-stim-codes.lua")
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--load box settings
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row_base = _G[box:get_setting(2)]
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col_base = _G[box:get_setting(3)]
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n_rows = box:get_setting(4)
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n_repetitions = box:get_setting(5)
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flash_duration = box:get_setting(7)
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noflash_duration = box:get_setting(8)
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inter_repetition_delay = box:get_setting(9)
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inter_trial_delay = box:get_setting(10)
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send_toggle = _G[box:get_setting(11)]
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time_to_send = box:get_setting(13)
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if box:get_setting(12) == 'true' then
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free_spelling = true
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n_trials = 1
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else
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free_spelling = false
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n_trials = box:get_setting(6)
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end
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--Lua variables
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send = false
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experiment_end = false
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tactilo_stimcodes = {}
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for x = 1, n_rows do
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tactilo_stimcodes[x] = row_base + x - 1
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end
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end
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-- this function is called when the box is uninitialized
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function uninitialize(box)
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end
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-- this function is called once by the box
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function process(box)
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while box:keep_processing() do
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if send and not experiment_end then
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-- iterate over the number of trials
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for trial = 1, n_trials do
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box:send_stimulation(1, OVTK_StimulationId_RestStart, box:get_current_time() , 0)
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wait_for(box, inter_trial_delay)
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box:send_stimulation(1, OVTK_StimulationId_RestStop, box:get_current_time() , 0)
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box:send_stimulation(1, OVTK_StimulationId_TrialStart ,box:get_current_time() , 0)
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-- iterate over the number of repetitions
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for segment = 1, n_repetitions do
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tactilo_stimcodes = create_sequence(tactilo_stimcodes)
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box:send_stimulation(1, OVTK_StimulationId_SegmentStart ,box:get_current_time() , 0)
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-- iterate over the number of tactilos
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for i = 1, #tactilo_stimcodes do
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box:send_stimulation(1, tactilo_stimcodes[i] ,box:get_current_time() , 0)
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box:send_stimulation(1, OVTK_StimulationId_VisualStimulationStart ,box:get_current_time() , 0)
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wait_for(box, flash_duration)
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box:send_stimulation(1, OVTK_StimulationId_VisualStimulationStop ,box:get_current_time() , 0)
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wait_for(box, noflash_duration)
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end
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box:send_stimulation(1, OVTK_StimulationId_SegmentStop ,box:get_current_time() , 0)
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wait_for(box, inter_repetition_delay)
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end
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box:send_stimulation(1, OVTK_StimulationId_TrialStop ,box:get_current_time() , 0)
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end
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if not free_spelling then
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-- end experiment if set to copy spelling
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box:send_stimulation(1, OVTK_StimulationId_ExperimentStop ,box:get_current_time() , 0)
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send = false
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experiment_end = true
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end
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else if not send and not experiment_end then
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-- delay the start of the experiment by t = time_to_send
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wait_for(box, time_to_send)
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send = true
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box:send_stimulation(1, OVTK_StimulationId_ExperimentStart ,box:get_current_time() , 0)
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end
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end
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-- releases cpu
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box:sleep()
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end
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end
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