sideritis extract mixture produces an impressive increase in memory performance animals treated with sideritis extract from example 5 fig4 broken line fig5 no 3 for instance are significantly faster in reaching the platform as early as on day 2 and also on days 3 and 4 even when compared with the u201c healthy animals u201d the treatment resulted in a considerable increase in the learning performance on days 2 and 4 testing based on behavioural biology commences at the age of approx 95 days in the morris water maze test model as described in example 11 95 100 d n 6 animals in accordance with the second control group control strain appps1 0 0 are compared with a parallel test group n 6 strain appps1 0 0 which have been treated with a sideritis extract from example 5 from the fiftieth day of their life both the escape latency and the time spent in the target quadrant showed an impressive increase in memory performance on days 2 3 and 4 after roughly a further 35 days the test set up was again used to compare both test populations d135 d150 the verum population was treated again for 15 days with.