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Focus on Physiology  April 2017
iWorx Systems, Inc.
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Focus on Physiology  April 2017

Focus on Physiology
May 2017

Featured Experiment

Red Light Green Light

Did you ever wonder why seeing the color RED elicits such a fast response to the pushing of the brake pedal? Would another color produce the same reactions time? What if the light was...BLUE? Are humans predisposed to understand that red means danger and it is something we need to respond to quickly?
Response/reaction time is generally defined as the length of time between the presentation of a sensory stimulus and the subsequent response. In other words, it is the time required for a person to detect the presence of a stimulus and react to it in some way. It is a physical skill that can be closely related to human performance and reaction. It also represents a certain level of neuromuscular coordination in which the body, through different physical, chemical and mechanical processes, interprets visual or auditory stimuli and then has a subsequent reaction to those stimuli. Reaction time can be determined when an individual is asked to press a button on an event marker as soon as a visual stimulus appears.  
There are various factors that affect the reaction time to a stimulus. Factors like intensity and duration of the stimulus, age and gender of the subject, and effect of practice (such as piano lessons or sports practices) can affect the reaction time of an individual to a particular stimulus. As an example, there are relative differences between the reaction time to visual and auditory stimuli between genders. Male athletes tend to be faster than female athletes in the same sport in responding to different stimuli. Age of the subject also can have a large effect on response time; this is one of the reasons there is pressure to have older drivers retake the Road Test.

Have your students learn the ins and outs of the LabScribe program while learning about how well they respond to a variety of colored visual stimuli.  Group your students to do a miniature "in-class study" to determine if females or males, athletes or non-athletes, or other groupings are better at their response times than others. 

To extend the exercises in this lab, simply add a second event marker and make it a competition to see who reacts faster to red or green light. These engaging experiments get your students actively learning and participating in their Anatomy & Physiology labs.

Download the Lab

View Lab (.pdf)
Newsletter Special Offer

Push Button-Switch

Push Button Switch


The EM-220 is a hand-held, push button switch. It connects directly to an Event Marker input on an IX-TA-220 or an IX-RA-834. When the button is pressed, the EM-220 delivers a TTL pulse which is displayed on a channel of LabScribe recording software.

15% discount if purchased prior to June 30, 2017.
Special Year End Savings Only for iWor Customers
Contact iWorx at 800-234-1757 or and mention promotion code EOY-2017and you'll receive a 15% savings on these add-on teaching kits purchased before June 31, 2017. Contact us today for a quotation.
High Value Add-On Sets for iWorx Physiology Teaching Kits
  • New Eye Tracker
  • New Reflex Set for HK-TA and PK-TA Physiology Teaching Kits
  • New Metabolic Cart Add-On
  • Psychological Physiology Add-On Set for HK-TA Human Physiology Teaching Kit
  • General Biology Add-On Sets for HK-TA Human and AHK-TA Combination Animal/Human Teaching Kits
  • Invertebrate Physiology
  • Assorted Sensors

Click here for more information and pricing

Web Links
Visit our Web Resources page to find more information about Posner's paradigm.

Upcoming Events

Experimental Biology (EB 2017)
Chicago, IL
April 22- 26, 2017

Human and Anatomy Physiology Society (HAPS 2017)
Sale Lake City, UT
May 24 - 26, 2017

Association for Psychological Science (APS)
Boston, MA
May 25 - 28, 2017

American College of Sports Medicine (ACSM)
Denver, CO
May 30 - June 3, 2017 
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