A measure of sentiment can be seen on the websites of some brokers - they display alongside forex charts the percentages of their clients who are long and short on that particular pair. I don't see supporting information - so we don't know how many clients that means, or what level of total capital is involved, or how often the percentages are calculated etc..
From watching these ratios it seems that intra-day price action doesn't have much effect on the sentiment display. The main factor is the trend on the daily chart. If the pair is in an obvious uptrend, sentiment will be bearish: if its in an obvious downtrend, sentiment will be bullish.
You have to remember also that most traders are losing money from their trading accounts, maybe 70-80% - so sentiment is often going to be badly wrong. Some people use sentiment as an indicator to take the opposite direction....