Reactions

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Flash can perceive events in less than an attosecond.

Reactions

Reactions may be defined simply as the time between a stimulus and a response. Three basic reaction time paradigms have been described:

• 1. Simple reaction time has a single stimulus and a single predefined response.
• 2. Recognition reaction time has several false stimuli mixed with one correct stimulus prompting the response.
• 3. Choice reaction time involves multiple stimuli and differing responses for each stimulus. Serial reaction time is a combination of recognition and choice reaction time, where the stimulus is a repeating sequence that the subject must learn to predict and then to respond in a prescribed fashion.

An example of simple reaction time would be the time from a buzzing sound to moving a finger. Adding false chime or ring sounds would convert the model to recognition reaction time, while creating different responses for the chime or other ring sounds would convert the model to a measurement of choice reaction time.

Reaction Tiers for Reaction Timeframes Only

Perception Tiers by Perceived Time, SI Equivalent, and Time Units

Perception Tier	Perceived Time (seconds)	Perceived Time (alternate units)	SI Equivalent (m/s)	Notes
Below Average perception	> 2.00e-1	> 200 milliseconds	< 5.00
Normal Human perception	2.00e-1 to 1.30e-1	200 to 130 milliseconds	5.00 to 7.69
Athletic Human perception	1.30e-1 to 9.97e-2	130 to 99.7 milliseconds	7.69 to 10.03
Peak Human perception	9.97e-2 to 8.05e-2	99.7 to 80.5 milliseconds	10.03 to 12.42
Superhuman perception	8.05e-2 to 6.48e-3	80.5 to 6.48 milliseconds	12.42 to 154.32
Superhuman+ perception	6.48e-3 to 3.64e-3	6.48 to 3.64 milliseconds	154.32 to 274.73
Transonic perception	3.64e-3 to 2.78e-3	3.64 to 2.78 milliseconds	274.73 to 359.71
Transonic+ perception	2.78e-3 to 2.24e-3	2.78 to 2.24 milliseconds	359.71 to 446.43
Supersonic perception	2.24e-3 to 9.26e-4	2.24 milliseconds to 926 microseconds	446.43 to 1,079.91
Supersonic+ perception	9.26e-4 to 5.83e-4	926 to 583 microseconds	1,079.91 to 1,715.27
Hypersonic perception	5.83e-4 to 3.89e-4	583 to 389 microseconds	1,715.27 to 2,570.69
Hypersonic+ perception	3.89e-4 to 2.92e-4	389 to 292 microseconds	2,570.69 to 3,424.66
High Hypersonic perception	2.92e-4 to 1.67e-4	292 to 167 microseconds	3,424.66 to 5,988.02
High Hypersonic+ perception	1.67e-4 to 1.17e-4	167 to 117 microseconds	5,988.02 to 8,547.01
Massively Hypersonic perception	1.17e-4 to 6.67e-8	117 microseconds to 66.7 nanoseconds	8,547.01 to 14,992,503.75
Massively Hypersonic+ perception	6.67e-8 to 3.34e-8	66.7 to 33.4 nanoseconds	14,992,503.75 to 29,940,119.76
Relativistic perception	3.34e-8 to 6.67e-9	33.4 to 6.67 nanoseconds	29,940,119.76 to 149,925,037.48
Relativistic+ perception	6.67e-9 to 3.34e-9	6.67 to 3.34 nanoseconds	149,925,037.48 to 299,850,299.40
Lightspeed perception	0	0 seconds	299,792,458 (c)	No time passes in perceiver's frame. Stimulus and response are simultaneous from their perspective.
Faster Than Light perception	Undefined / Negative	Undefined / Negative	> 299,792,458 (theoretically)	Perceived time cannot be positive. Fiction may depict as acausal (reaction before cause) or simply not define it. Index as qualitative tag only.