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Topic: Reaction Time

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	Reaction Time Clinic
		You should be comfortable with the reaction times before you worry about Top-End Tactics.
		We said that each light was a half-second apart, and thus a.500 light was a perfect reaction time.
		Through experimentation, both in my college physics lab, and with the practice tree, I have determined that human reaction time is roughly.21 seconds, plus or minus several hundredths for individual differences, and human inconsistency.
	www.asmartin.com /b_react.htm (1431 words)

	Visual Expert Human Factors: Driver Reaction Time
		Reaction time depends to some extent on the distance to the obstacle and whether it is approaching from the side and is first seen in peripheral vision.
		The increased reaction time is due to several factors, including the need to interpret the novel situation and possibly to decide whether there is time to brake or whether steering is better response.
		Perception times are presumably the same, but assuming the hands are on he steering wheel, the movement required to turn a wheel is performed much faster than that required to move the foot from accelerator to brake pedal.
	www.visualexpert.com /Resources/reactiontime.html (3112 words)

	Literature Review on Reaction Time
		Reaction times ranged from 420 msec for 1 valid stimulus (such as one letter in symbol recognition) to 630 msec for 6 valid stimuli, increasing by about 40 msec every time another item was added to the memory set.
		Reaction time is fastest with an intermediate level of arousal, and deteriorates when the subject is either too relaxed or too tense (Welford, 1980; Broadbent, 1971; Freeman, 1933).
		Bellis (1933) reported that mean time to press a key in response to a light was 220 msec for males and 260 msec for females; for sound the difference was 190 msec (males) to 200 msec (females).
	biae.clemson.edu /bpc/bp/Lab/110/reaction.htm (4943 words)

	Reaction time - Wikipedia, the free encyclopedia
		With regards to reflexes, reaction time is the time from the onset of a stimulus until the organism responds.
		Complex reaction time is the latency between a variable stimulus and a respectively variable response.
		An understanding of physical reaction time is critical for fields such as ballistics, archery, athletics and the physical sciences in order to estimate and measure.
	en.wikipedia.org /wiki/Reaction_time (378 words)

	Drag Race Reaction Time and Movement Time
		The true definition of reaction time is: The time begins with the initiation of the stimuli and the initiation of the movement.
		Reaction time is fastest with an intermediate level of arousal, and deteriorates when the subject is either too relaxed or too tense.
		Lab experiments found that reaction time to a visual stimulus decreased with three weeks of practice and that training older people to resist falls by stepping out to stabilize themselves did improve their reaction time.
	www.lextreme.com /rt.html (1866 words)

	Fingertip Reaction Time
		Reaction time is the time discrepancy between the moment of change in the environment and the beginning of your response.
		Fingertip reaction time is tested by dropping a ruler between the outstretched fingers of the subject without warning.
		The average reaction time is 0.1778 s for male students, 0.1950 s for female students, 0.2033 s male teachers, and 0.1878 s for female teachers (refer to the graph for the rest of the information: median, quartile, etc.).
	hypertextbook.com /facts/2006/reactiontime.shtml (1372 words)

	Reaction Time - Technology Associates
		This time interval, commonly called the reaction time, has been found to be about 0.7 second for all normal persons, regardless of their background and training.
		First, the time interval must be counted from the instant the brain, having perceived the potential danger, decides that an accident is imminent.
		In this case, the perception time is the time during which the trucker becomes increasingly aware of the possibility of the stack falling on him, but before he decides that this dangerous possibility is imminent.
	www.technology-assoc.com /brief.asp?subject=reaction (551 words)

	Reaction Times and Sprint False Starts
		The reaction time is the time is takes for the runner to respond to the start signal and begin leaving the starting blocks.
		But there is no reason to think that their reaction times are unrepresentative of their potential - unlike running through pain barriers or risking injury from over-exertion, reacting quickly in a semi is unlikely to diminish your performance in the next days final.
		The reaction time corresponding to 50% is the average reaction time, and the idea of the graph is to show the spread of the distribution.
	condellpark.com /kd/reactiontime.htm (3171 words)

	Reaction Time Experiment Set Instructor's Page (Site not responding. Last check: 2007-09-09)
		These experiments give students the opportunity to determine whether their reaction times are reliably different for reaction time tasks that require slightly different decisions.
		The dependent variable is the time from the onset of the stimulus to the keypress reaction measured to the nearest millisecond.
		To determine whether reaction time was affected in a systematic way by the nature of the task, they can group the mean or median reaction times for a set of research participants and then perform a one-way analysis of variance on the grouped data.
	psychexps.olemiss.edu /InstrOnly_Page/reactime.htm (722 words)

	Reaction Time and Reacton Speed Drills
		Reaction time is the interval time between the presentation of a stimulus and the initiation of the muscular response to that stimulus.
		Hick discovered that the reaction time increases proportionally to the number of possible responses until a point at which the response time remains constant despite the increases in possible responses (Hick's Law).
		Reaction time itself is an inherent ability, but overall response time can be improved by practice.
	www.brianmac.demon.co.uk /reaction.htm (718 words)

	James Rowland Angell and Addison W. Moore: Reaction-Time: A study in Attention and Habit. (Site not responding. Last check: 2007-09-09)
		Most of the reactions in the light were taken with the eyes resting upon the responding organ, save of course in the case of reactions to visual stimulus.
		The reaction ' e-s meaning the whole act to be performed is not the mere response of the hand to the ear, but the act of attention in coordinating the incoming stimuli from both the hand and the ear.
		Regarding the act, however, in an objective way, we should expect the time of the reaction to be shortest when the attention is upon that part of the process which is least habitual, or in which habit encounters the most new conditions.
	spartan.ac.brocku.ca /~lward/Angell/Angell_Moore_1896.html (4614 words)

	Testing reaction time (Site not responding. Last check: 2007-09-09)
		Reaction time is important in many sports and day to day activities, though it is not often measured.
		For example, in the click reaction time test, when you see the screen color change, the signal for the change in color travels from your eye along the optic nerve to be registered in your brain, from which a message is sent to another part of your brain that controls your muscles.
		Signals travel fast along each of the nerve pathways required, however the majority of the reaction time is taken up at the junction points in between the different nerves involved, and between the nerves and the muscles at your fingers.
	www.topendsports.com /testing/reactime.htm (309 words)

	American Psychological Society: Think Fast: Reaction Time and IQ May Predict Long Life (Site not responding. Last check: 2007-09-09)
		Both tests of mental ability were associated with life span, but reaction time was the stronger indicator.
		Reaction time is moderately related to IQ, but is a simpler assessment of the brain's information-processing ability - one that doesn't bear so much on other, possibly confounding factors like knowledge, education, or background.
		Slow reaction times could reflect a degeneration of the brain, which in turn could reflect degenerating physical health (an obvious possible cause of earlier mortality).
	www.psychologicalscience.org /media/releases/2005/pr050202.cfm (619 words)

	ZOOM . activities . sci . Reaction Time \| PBS Kids
		Along the left side of the paper (the y axis) write the times from the reaction time chart in separate rows.
		Your reaction time is how long it took for your eyes to tell your brain that the ruler was falling and then for your brain to tell your fingers to catch it.
		I timed someone with stresses and someone with out stresses and the reaction time was slower with stresses.
	pbskids.org /zoom/activities/sci/reactiontime.html (1094 words)

	Reaction Time
		Record the distance that the ruler fell (where you caught it), during the time that your body was reacting.
		Dynamic time can be found by timing 25 complete pinches (open and close) and then dividing that time by 50 (since each open and close is two actions).
		Each group of students should be able to determine their reaction time and dynamic time for moving their foot off of the gas to the brake.
	www.iit.edu /~smile/ph92rc.html (630 words)

	Reaction Time (Site not responding. Last check: 2007-09-09)
		There are a number of reports of a left hemisphere advantage for visual inspection time, but some investigators employing slightly different methodologies have failed to replicate the effect.
		Timing of finger tapping to frequency modulated acoustic stimuli.
		Timing accuracy in motion extrapolation: reverse effects of target size and visible extent of motion at low and high speeds.
	www.accelerated-learning-online.com /research/CTG-Reaction-Time-164.asp (721 words)

	Reaction Times
		Here's a program to test a subject's reaction time by measuring the time between showing a target on the screen and receiving a response indicating that the subject has seen it.
		We'll record the time when the target is displayed and again when a response is obtained either by a mouse click or a key press.
		The reaction times are accumulated along with the sum of the squares of the reaction times (we'll discuss why in a minute).
	www.delphiforfun.org /programs/Reaction_times.htm (1176 words)

	Time to Think?
		In the later part of the nineteenth century, both anatomical and physiological observations had developed to the point where many aspects of behavior were comfortably attributed to the nervous system, but "thinking" continued to be considered by many as something different, something non-material, "mental", or "spiritual".
		This time includes the time for the input signal to be transduced into neural activity, the time for neural signals to move from the sensory structure to the muscles involved in action, and the time for muscle contractions.
		Because the times involved are quite short (fractions of a second in general), Donders had to develop new technology to make the observations in which he was interested, and technological developments have played a significant role in the continuing development of reaction time research.
	serendip.brynmawr.edu /bb/reaction (791 words)

	The Science House - Science of Sports
		Since an average human reaction time is only a fraction of a second, it would be impossible to measure it directly.
		Use this equation to determine the average reaction time for you and your partner.
		If you have extra time after doing the calculations and addressing the discussion and conclusion sections repeat the experiment, but this time have the person catching the meterstick sing (or hum) their favorite song while trying to catch it.
	www.science-house.org /student/bw/sports/reaction.html (505 words)

	Mobile Computing: Reaction Time Procedure
		In the row next to "Mean", in each column, under sight, sound, and touch enter the formula to calculate the mean reaction time for all ten trails.Refer to Technical Hints to perform an average.
		This time, touch his or her arm lightly with your finger just as you let go of the ruler.
		Using mean reaction times, create a bar chart to compare the data for sight, sound, and touch cues.
	mit.concord.org /5th/sc5rtime-proc1.htm (375 words)

	Reaction Time
		After the pitcher goes through his windup and releases the ball, you only have four tenths of a seconds to recognize where the ball is, begin to start your swing and transfer momentum, and decide on where to swing the bat and make contact with the ball.
		The total time the ball takes to travel from leaving the pitchers hand to the plate is only 400 milliseconds.
		When considering you do not have that much time to start transferring your momentum to provide power, the game is really played in a short amount of time.
	members.tripod.com /physicsgroup4/id18.htm (403 words)

	Science NetLinks: Reaction Time 2: Zap! (Site not responding. Last check: 2007-09-09)
		In Reaction Time 2: Zap!, students build upon what they have already learned by participating in another online reaction-time activity—this one testing their visual and auditory abilities (both separately and together).
		As they play the game and record their reaction times, they quickly learn that there are very different skills and strategies involved in reacting to something when seeing and listening are required.
		Students can evaluate their reaction times further by playing this simple and enjoyable online Hit-the-Dot activity, which tests the accuracy of their hand-eye reaction times and coordination.
	www.sciencenetlinks.com /lessons.cfm?DocID=364 (1188 words)

	The Science House - It's About Time
		Changing the concentration or the temperature of the solutions changes the time required for the blue color to be produced.
		To change the time of the reaction, adjust the amount of sodium metabisulfite in solution B or dilute solution A. You can also adjust the temperature to see its effect on the reaction rate by placing your beakers in a water bath of hot or cold water.
		Investigate the affect of temperature and/or concentration on the time for the reaction.
	www.science-house.org /student/bw/time/clockrxn.html (299 words)

	car_math
		You can find your reaction time by measuring the distance an object falls before you catch it.
		The equation for the time, t, it takes to free fall at the acceleration of gravity, g, over a distance,d, from rest is:
		Average human reaction time from eyes to fingers is 0.16 s.
	www.exo.net /~pauld/books/car_science/reactiontimer.html (338 words)

	Virtual Lab: Reaction time java applet
		The time delay between the red light is turned on and you click the brake button will be shown in the textfield.
		Reaction time : the lapse of time between stimulation and the beginning of response.
		But, there is a small time delay before you really do that--- your reaction time.
	www.phys.hawaii.edu /~teb/java/ntnujava/Reaction/reactionTime.html (356 words)

	Time to Think? Web Links
		Reaction Time --- from Visual Expert: Perception, Attention, Memory, a discussion of reaction times in the context of driving and the law
		Measuring and Recording Reaction Time Under Different Conditions ---- a little different, click on target which may appear at different locations, javascript, from Dr.
		Reaction Time Too --- Here's the other Javascript reaction program widely used on the web.
	serendip.brynmawr.edu /bb/reaction/reactionlinks.html (581 words)

	Competition Plus.com - Drag Racing's Internet Magazine
		Since there is a half-second (or.500 seconds) delay until the green light comes on, a.500 reaction time is perfect.
		In short, since you have less rollout, it takes your tire less time to leave the starting line, and so your reaction times will be faster.
		Through experimentation, both in my college physics lab, and with the practice tree, I have determined that human reaction time is roughly.21 seconds, plus or minus several hundredths for individual differences, human inconsistency, and the type of light source.
	www.competitionplus.com /2005_02_03/reaction_times.html (1932 words)

	MUSEUM OF THE HISTORY OF REACTION TIME RESEARCH
		Interest in the measurement of human reaction time (the time elapsing between the onset of a stimulus and the onset of a response to that stimulus) apparently began as a result of the work of a Dutch physiologist named F.
		This shift in vibration speed was often audible to the experimenter who would discard the data from that reaction time trial but the problem persisted and no solution was ever found.
		Another problem was caused by the time it took for the electric current to release and pull-in the solenoid which operated the clutch.
	www.chss.montclair.edu /psychology/museum/mrt.html (1690 words)

	Math B - Statistics and Linear Regression
		The data, as gathered in the second part of this lab, will be (or should be) a linear regression.
		Another student, whose reaction time is being measured, rests his/her arm on a desk and places the thumb and forefinger around the 0 cm.
		to the “catch” position is proportional to the elapsed time from the drop to the catch and can be used to measure reaction time.
	regentsprep.org /Regents/mathb/6C1/reactiontime.htm (283 words)

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