99.99% attackers in aikido don't know how to deliver a difficult attack. They do so called ‘zombie attack'. It is not worth for me nor to discuss it, nor practice it.
However sometimes we can meet somebody who really knows how to attack. He usually has a background in street fighting or competition oriented sparring and matches.
In such very rare and precious cases it is virtually impossible or most difficult to do any technique, due to lack of clear commitment. Of course such commitment exists, otherwise the effect of attack would be null, but it is very well hidden until last moment, and last for very, very short time. Immediately after successful attack he disengages looking for next opportunity to attack.
How you deal with such situation? I mean how to discover the moment he decides to attack? And how to extend this short time when he is well engaged? Any particular training methods?
Please refrain from this nonsense IP/IS discussion..
As I see it - "commitment" is a red herring - it doesn't have much to do with whether or not an attack can be handled or not. The real problem is that most Aikido folks deliberately (but perhaps unknowingly) train to tense and weight their attack in such a way that they are easily throwable (I just heard a shihan from hombu specifically tell people to attack that way). It's not necessarily a bad thing - for training, but it shouldn't be done unless it is being done intentionally, for a specific purpose. Otherwise, you're conditioning yourself to be throwable - not such a great idea.
People who are better at attacking won't usually double weight themselves for you, so it's probably going to be pretty difficult to get that nice clean technique off the first attack.
The particular training methods ought to be...Aikido - if they aren't, then something wrong