I am creating a link to a Youtube video I found for doing this simple 12-minute (or so) meditation which involves chanting or singing four syllables: SA TA NA MA. First, you sing them aloud for 2 minutes, then you whisper them for 2 minutes, then silently say them for 4 minutes, then whisper again for 2 minutes, then aloud again for 2 minutes. The music and voice will keep you on track so you don't have to time anything. While doing the above, you sit in whatever way is comfortable for you, close your eyes and touch your index finger, middle finger, ring finger and pinky to your thumbs as you sing, whisper or silently repeat the four syllables. The image in the video demonstrates this.
Now, I know this is a little bit "out there" for some of my readers, but, hey--is improving your cognition and strengthening the hippocampus of your brain to help prevent Alzheimer's worth 12 minutes a day of your time? Try it for 6 weeks and see if you notice a difference. I'd love to hear your feedback!