General parameters

• stim_type - type of stimulus, e.g. ‘sine’, ‘bar’, ‘dots’

• stim_form - stimulus data format, default is ‘3d’

  • 3d - data is a 3D float array. Often processed by FFT conv.

  • 3c - data is a 3D int array, packed w/ 3bytes of RGB color.

    Array indexing starts at 0.

  • 3d_b - binocular 3D data.

  • 1d - data is a 1D float array.

• stim_samp - stimulus sampling rate (frames/s). This can

  be used to allow black frames to be interleaved between regular frames to emulate a CRT. For example, if tscale is 0.002 (two milliseconds) and stim_samp is 100, impling that the stimulus is defined once every 10ms, then there will be four empty frames between each regular stimulus frame. The four empty frames could be set to black, as they would be on a CRT with a very fast phosphor decay, or you can set stim_phtau below to simulate a decaying phosphor signal. More typically, one is not trying to emulate the flashing of conventional CRTs, and stim_samp is set to a value faster than or equivalent to that implied by tscale, in which case the mapping from stimulus frames to temporal frames in the model is 1-to-1. Until more complete documentation on this feature is developed, it is recommended to email Wyeth if you are unsure about this feature.

• stim_nrpt - number of repeats of each stimulus. When this is

  greater than 1, the same visual stimulus will be presented multiple times, but any noise that is added will be differnt.

• write_stim_num - (-1 no dump) stimulus ID number for 3D data dump

• write_stim_rpt - (0) repeat number for 3D data dump