Spurred by a near epidemic occurrence of brain-degenerating conditions as we age, people of all ages and backgrounds are stepping up their personal efforts to improve and maintain their brain health. According to a story in USA Today, sales of brain fitness software reached nearly $230 million in 2007. USA Today stated, "SharpBrains, (a market research firm) estimates the brain fitness software market will reach $2 billion in 2015 in the United States."

Prudent investment strategy might include a speculative foray into this popular and growing field. In light of this, you may wish to pay heed to blogger Steven Mallas, and read his take on Activision (NASDAQ: ATVI).

First on the list for brain maintenance is physical activity, which probably accounts for the outstanding sales of Nintendo's Wii Fit. from Nintendo Ltd. (OTC: NTDOY). Active lives promote healthy blood circulation, which helps to feed steady amounts of oxygen to the hungry brain. Good hard work, cardiovascular exercise and even regular sexual activity can all help to keep your heart pumping adequate levels of oxygen into your brain.

Learning Tree International Inc. (Nasdaq: LTRE), which provides information technology and management training, was a fast grower from 1974 to 2000. However, since then, things have languished. True, the company has instituted various initiatives to jump-start growth, but such measures will take some time.

So, in the meantime, Learning Tree is trying to sell out. That is, the company has formed a special committee to explore the possibility of selling itself and has retained RBC Capital Markets as a financial advisor.

Learning Tree is likely to be attractive to private equity players as well as strategic buyers. Over the past few years, the company has improved its operating performance, earned 50% of sales from overseas and has $56 million in the bank, without debt. What's more, the company has no school loan exposure.

MOST NOTEWORTHY: Learning Tree, Shengdatech and Cepheid were today's noteworthy initiations:

• B. Riley initiated Learning Tree (NASDAQ:LTRE) with a Buy rating and $24 target. The firm believes investors have an opportunity to invest in a compelling revenue growth/margin expansion story at reasonable multiples with the stock off recent highs.
  
• Merriman started Shengda Tech (NASDAQ:SDTH) with a Buy rating and points to the company's growing nano-particle business and the vast market expansion opportunities associated with this business.
  
• Stephens believes Cepheid (NASDAQ:CPHD) possesses a best-in-class platform for molecular diagnostic testing with a virtual monopoly in the molecular point of care market; shares were assumed with an Overweight rating and $32 target.

OTHER INITIATIONS:

• Visa (NYSE:V) was started at Morgan Keegan with a Market Perform rating.
  
• Morgan Stanley initiated Dr. Pepper Snapple (N YSE:DPS) with an Equal Weight rating and $30 target.
  
• Goldman initiated Kraft Foods (NYSE:KFT) with a Neutral rating.

For anyone that is actually watching the markets next week, here is just about everything happening in a very light four-day week sandwiched between two national holidays.

Monday December 25

• Markets are closed for the Christmas holiday

Tuesday December 26

• Healthcare conference calls: Merrill Lynch 10:00am, Bank of America 10:30am, Bear Stearns 11:00am

Wednesday December 27

• Delta and Pine Land Company (NYSE: DLP) will hold an earnings conference call at 10:00am
• Bear Stearns will hold a retailing-broadlines conference call at 10:00am

Thursday December 28

• Learning Tree International Inc (NASDAQ: LTRE) will hold its earnings conference call
• Newpark Resources, Inc (NYSE: NR) will hold its shareholder meeting at 11:00am
• Hurray! Holding Co., Ltd (NASDAQ: HRAY) to hold a firm-sponsored meeting with Think Equities

Friday December 29

• The Mills Corporation (NYSE: MLS) will hold its shareholder meeting at 10:00am