I wish to know whether a qualitative research can be done on the investors behaviour in the stock market specifically when the market is falling sharply?
For qualitative (non-quantitative) research I would suggest reviewing reputable news commentaries (eg UK Financial Times, US Wall Street Journal). You might also be able to access investor views via relevant bulletin boards such as the UK's www.iii.co.uk. You would need to register and registration is free. This is used both by retail investors as well as institutional investors. And you can pose questions if you wish.