CO 6 “ Introduction to Computational Neuroscience ”
نویسنده
چکیده
(1) Signal Detection Theory: Consider the two-alternative-choice motion discrimination task in which the subject has to determine the direction of motion of a stimulus. As ideal observers, we obtain access to two neurons with opposite tuning (so that e.g. neuron 1 will fire more strongly than neuron 2 if the motion stimulus moved leftwards, and neuron 2 more strongly than neuron 1 if the motion stimulus moved rightwards). If the motion was to the left (+), then the firing rates of neuron 1 follow the distribution p(r|+) and those of neuron 2 the distribution p(r|−); if the motion was to the right (−), neuron 1 fires according to p(r|−) and neuron 2 according to p(r|+). (a) Assume that the distributions p(r|+) and p(r|−) are Gaussian and sketch the above scenario (two neurons, two possible stimuli).
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