Uploaded image for project: 'The Virtual Brain'
  1. The Virtual Brain
  2. TVB-1305

Enable operations on state variables before the neural activity is projected onto a monitor's space

    XMLWordPrintable

    Details

      Description

      This issue concerns models and monitors and how their are linked through
      variables of interest.

      #Background:
      The relevant input neural activity for the different types of biophysical
      recordings sometimes corresponds directly to one of the model's state
      variables. However very often we found that the what is measured is the result
      of the difference or summation of two or more state variables.

      #Current implementation:
      The recently introduced Epileptor is one example. The Jansen-Rit and
      Zetterberg-Jansen models are good examples as well. The latter has an extra
      state variable to describe the difference. However, this remains inside the
      model. With the current implementation, if we wanted to see difference between
      another pair of state variables, we should define yet another equation.

      #What we need:
      A mechanism specific to the monitors that performs a weighted sum with the set
      of state variables.

      Example:
      Let x and y be the variables that describe the temporal evolution of a certain
      quantity 'q', for two different assemblies of neurons (ie, two neural masses).
      The input neural activity required for computing the BOLD signal is, for
      instance, x-y.

      At the implementation level, this would have x and y as the variables of
      interest and the weights should be w_x = 1 and w_y= -1.

      After performing the operation the neural activity is projected onto the
      corresponding biophysical state.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                paula.sanz-leon Paula Sanz Leon
                Reporter:
                paula.sanz-leon Paula Sanz Leon
              • Votes:
                0 Vote for this issue
                Watchers:
                4 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:

                  Time Tracking

                  Estimated:
                  Original Estimate - 1 week
                  1w
                  Remaining:
                  0m
                  Logged:
                  Time Not Required
                  Not Specified