Figure 3. The average mean latency to locate a submerged platform in the MWM test over four weeks. Mice received daily injections of saline or cannabis extract (5, 10 or 20 mg/kg) alone or combined with donepezil, piracetam, vinpocetine or Ginkgo biloba and were tested three times weekly. Asterisks indicate significant change from the saline control group and between different groups as shown in the figure. The plus sign indicates significant change from the cannabis 20 mg/kg group. The # sign indicates significant change from the cannabis 10 mg/kg group. Other statistical comparisons between different treated groups are also shown and are indicated by asterisks.