Experimental setup for competition of overlapping stimuli.
- Author
- Frederik Beuth
Data: MacEvoy, Tucker, Fitzpatrick (2009), Fig. 2a-c
Significant results (p. 2 bottom)
- Significance test were not used. They simply stated that changing the angle between the gratings changes the tuning curve, leading to an unimodal tuning curve for a narrow angle.
Setup
- Stimuli are oriented bars at 1) 90 and 135°, 2) 70 and 110° and 3) 80 and 100°, so execute 3 subexperiments
- Use 37 neurons to match each 5° of the range from 0° to 180° to a single neuron
- Record the neuron preferring the stimulus 1 in V1
- Experiment does not use attention, so record the neurons only in the attend away conditions
- Experiment uses overlapping stimuli, so place both stimuli at the same place
- Experiment repeats the stimulus (0.25° width bar) every 3°, thus those drive adjacent neurons outside the RF too. We model 3 of these stimulus repetition via a large spatial dimension (6.6°) with 3 stimuli at 0.2°, 3.2, 6.4°.
Calibration of the fit:
- Use tuning curves as shown in MacEvoy2009, Fig2a-c
- Calibrate the amount and shape of suppression afterwards