Population vector
In neuroscience, a population vector is the sum of the preferred directions of a population of neurons, weighted by the respective spike counts. The formula for computing the (normalized) population vector, formula_1, takes the following form: formula_2 Where formula_3 is the activity of cell formula_4, and formula_5 is the preferred input for cell formula_4. Note that the vector formula_1 encodes the input direction, formula_5, in terms of the activation of a population of neurons.