// load a volume for computation
void emotionRoiProcessing::loadVolume(studyParams &vdb, volume<float> &v, int index)
{
char processedFile[200], prefix[BUFF_SIZE], tempVolume[BUFF_SIZE];
if (0)
{
// gets the motion corrected and gaussian file
vdb.getMCGVolumeName(processedFile, index);
read_volume(v, string(processedFile));
}
else
{
// making the activation volume for viewing
vdb.getFinalVolumeFormat(prefix);
vdb.setActivationFile(index);
estimateActivation(index, index, vdb.slidingWindowSize, prefix, vdb.maskFile, vdb.activationFile);
// gets the motion corrected and gaussian file and calculates the mean with the last n volumes (n = sliding window size)
sprintf(tempVolume, "%s%s", vdb.outputDir, "temp.nii");
vdb.getMCGVolumeFormat(prefix);
estimateActivation(index, index, vdb.slidingWindowSize, prefix, tempVolume);
read_volume(v, string(tempVolume));
if (fileExists(tempVolume))
remove(tempVolume);
}
}
// plug in test function
DLLExport testSVM(studyParams &vdb, int index, float &classnum, float &projection, void * &userData)
{
char prefix[BUFF_SIZE];
SVMProcessing *svmProcessingVar = (SVMProcessing *) userData;
vdb.getFinalVolumeFormat(prefix);
fprintf(stderr, "Generating activation file.\n");
vdb.setActivationFile(index);
estimateActivation(index, index, vdb.slidingWindowSize, prefix, vdb.maskFile, vdb.activationFile);
fprintf(stderr, "Classifying.\n");
svmProcessingVar->test(index, vdb.activationFile, classnum, projection);
return 1;
}
void FunctionalConnectivity::processVolume(studyParams &vdb, int index, float &classnum, float &projection)
{
char volumeFile[BUFF_SIZE];
// calculate correlations
vdb.getVolume(volumeFile, index, volumeType);
connectivityCalculator.calculateCorrelations(volumeFile);
// calculate zNorm ROI means for graphic display. This values are meant for FRONT END display. We do a incremental zcore calculation to avoid problems in graphic display causedby differente bold values levels in different rois.
for (int t=0; t < connectivityCalculator.numRegions; t++)
{
double value = connectivityCalculator.means[t];
outputMeanReport << connectivityCalculator.means[t] << " ";
zNormRegionMeans[t].addValue(value);
zNormRegionMeanValues[t] = zNormRegionMeans[t].zValue(value);
}
outputMeanReport << "\n";
// calculate mean correlation
double correlationMean=0;
for (int t=0; t < connectivityCalculator.numPairs; t++)
correlationMean += connectivityCalculator.correlations[t];
// remember here we have only one pair of rois to form a correlation. Other calculations with more than one pair are possible. You have the power to define it in your way.
correlationMean /= connectivityCalculator.numPairs;
// saving the results in a file, for debug purposes
outputCorrelationReport << correlationMean << "\n";
outputMeanReport.flush();
outputCorrelationReport.flush();
// calculate weigted mean
correlationWeightedMean.addValue(correlationMean);
// calculates the incremental correlation stats
correlationStats.addValue(correlationMean);
if (true)
{
// Calculate a dynamic range to be used in coupling task
minCorrelationBaseline = correlationWeightedMean.mean - correlationMultiplyer * correlationStats.deviation;
maxCorrelationBaseline = correlationWeightedMean.mean + correlationMultiplyer * correlationStats.deviation;
// get Classe
classnum = vdb.getClass(index);
// get projection (percentage)
fprintf(stderr, "condition = %s\n", vdb.getCondition(index));
bool randomLike = (strcmp(vdb.getCondition(index), stabilizationCondition) == 0) || vdb.randomRun;
if (vdb.interval.isBaselineCondition(index))
{
fprintf(stderr, "Baseline condition.\n");
projection = 0;
}
else if (randomLike) // stabilization mode. the participant is encouraged to maintain state.
{
fprintf(stderr, "Stabilization task.\n");
fprintf(stderr, "Mean = %f mean 2 = %f\n", correlationMean, correlationWeightedMean.mean);
projection = 1-abs(correlationMean-correlationWeightedMean.mean);
}
else // coupling task. the participant is encouraged to coupling anterior temporal lobe and subgenual areas. Here we use a dynamic range for transform the correlation in a percentage.
{
fprintf(stderr, "Coupling task.\n");
fprintf(stderr, "Mean = %f min = %f max = %f \n", correlationMean, minCorrelationBaseline, maxCorrelationBaseline);
projection = (correlationMean-minCorrelationBaseline) / (maxCorrelationBaseline-minCorrelationBaseline);
}
outputFeedbackReport << index << " - " << projection << "\n";
}
// enforcing value limits 0 and 1
if (projection > 1) projection = 1;
else if (projection < 0) projection = 0;
fprintf(stderr, "Projection value = %f \n", projection);
}
// calculates the feedback value
int emotionRoiProcessing::processVolume(studyParams &vdb, int index, float &classnum, float &feedbackValue)
{
int idxInterval = vdb.interval.returnInterval(index);
double positivePSC, negativePSC;
volume<float> v;
loadVolume(vdb, v, index);
// if in baseline condition, calculates the mean volume, one by one
classnum = vdb.getClass(index);
feedbackValue = 0;
double intervalSize = (double)(vdb.interval.intervals[idxInterval].end - vdb.interval.intervals[idxInterval].start + 1);
if (vdb.interval.isBaselineCondition(index))
{
if (vdb.interval.intervals[idxInterval].start == index) meanbaseline = v;
else meanbaseline += v;
// in the end of condition, divides the sum by the size of the current block
if (vdb.interval.intervals[idxInterval].end == index)
{
meanbaseline /= intervalSize;
meanCalculation.calculateMeans(meanbaseline);
// calculates the mean roi value of the mean volume. We just need this value
positiveBaseline = meanCalculation.roiMean(positiveIndex);
negativeBaseline = meanCalculation.roiMean(negativeIndex);
}
}
else // task condition. Taking the mean of the volume and calculating the PSC
{
meanCalculation.calculateMeans(v);
positivePSC = PSC(meanCalculation.roiMean(positiveIndex), positiveBaseline);
negativePSC = PSC(meanCalculation.roiMean(negativeIndex), negativeBaseline);
// negative emotion Feedback
if (classnum == 1)
{
feedbackValue = negativePSC / negativeTargetValue;
if (vdb.interval.intervals[idxInterval].start == index) negativePSCMean = negativePSC / intervalSize;
else negativePSCMean += negativePSC / intervalSize;
if (vdb.interval.intervals[idxInterval].end == index)
{
if (negativePSCMean >= negativeTargetValue)
negativeBlocksAboveTarget++;
}
if (negativePSC > 0)
negativeActivationLevel.addValue(negativePSC, 1);
double valueLevel = negativeActivationLevel.mean * (1 + levelMultiplyer);
if (valueLevel > 0) negativeTargetValue = valueLevel;
}
else if (classnum == 3)
{
feedbackValue = positivePSC / positiveTargetValue;
if (vdb.interval.intervals[idxInterval].start == index) positivePSCMean = positivePSC / intervalSize;
else positivePSCMean += positivePSC / intervalSize;
if (vdb.interval.intervals[idxInterval].end == index)
{
if (positivePSCMean >= positiveTargetValue)
positiveBlocksAboveTarget++;
}
if (positivePSC > 0)
positiveActivationLevel.addValue(positivePSC, 1);
double valueLevel = positiveActivationLevel.mean * (1 + levelMultiplyer);
if (valueLevel > 0) positiveTargetValue = valueLevel;
}
fprintf(stderr, "Feedback value = %f\n", feedbackValue);
}
return 0;
}
