2.1.7 Here comes the hammer.pptx

HBS 2.1.7

here comes the hammer

• Goal: compare voluntary reaction times to involuntary response (reflex)times

reflex

• Tools needed: EKG leads, reflex hammer, acceleration sensor, labquest mini box, EKG pads, Graphical Analysis software

Overview of Lab

• You will test your voluntary reaction times
• Work in pairs (tester and subject)
• Apply EKG leads to subject
• Subject should face away from tester
• Tester will hit the hammer on the lab table
• When the subject hears the hammer, they should kick their lower leg
• Repeat 5-10 times
• Save the data!!!

Part 1 of lab

• You will test your reflex times (involuntary)
• Tester will hit the subject’s patellar tendon
• Subject should keep leg relaxed - allow the reflex to occur (don’t force it and don’t fight it)
• Repeat 5-10 times
• Save the data

When you’re finished, switch roles & repeat parts 1 and 2 MAKE SURE YOU SAVE ALL DATA!!!

Part 2 of lab

Tutorial

• Once you’ve collected all data, you will analyze it and record it on the handout provided

• All results will be shared and we’ll discuss class trends

ANALYSIS

Next, you’ll practice some basic data analysis on a data set provided in step 6

• Open the data set (step 6)
• Sort by age (use the embedded video if you need help)
• Decide how you want to group the data
• For each data set,
• Highlight outliers in yellow
• Calculate the mean reaction time & reflex time
• Calculate the range for the reaction times & reflex times
• Create a visual representation of the means (graph) - make sure all axes are labeled (if you want/need to make more than one, you can!)
• Create a figure legend (title) below the figure that describes any trends you see in the data.

the details are in the data