What is the shortest perceivable application response delay?

Question

A delay will always occur between a user action and an application response.

It is well known that the lower the response delay, the greater the feeling of the appli

Answer 1

I am a cognitive neuroscientist who studies visual perception and cognition.

The paper by Mary Potter mentioned above regards the minimum time required to categorize a visual stimulus. However, understand that this is under laboratory conditions in the absence of any other visual stimuli, which certainly would not be the case in the real world user experience.

The typical benchmark for a stimulus-response / input-stimulus interaction, that is, the average amount of time for an individuals minimum reaction speed or input-response detection is ~200ms. to be certain there is no detectable difference, this threshold could be lowered to around 100ms. Below this threshold, the temporal dynamics of your cognitive processes take longer to compute the event than the event itself, so there is nearly no chance of any ability to detect or differentiate it. You could go lower to say 50 ms, but it really wouldn't be necessary. 10 ms and you've gone into the territory of overkill.