Biopac Student Lab One

What is the Biopac Student Lab System

An integrated set of software and hardware for life science data acquisition and analysis.

What are the inputs on the MP unit are referred to as

Channels

What is the function of the Analog Out port on the back of MP3X Units

Allows signals to be amplified and sent out to devices such as headphones

How should you think of the Biopac Student Lab

Like a video camera connected to a computer and viewed through the computer monitor.

Volt

A unit of measure of the electrical activity at any instant of time

How are the body’s electrical signals are detected

Via transducers and electrodes that send the information to the MP data acquisition unit computer via a cable

Amplitude

Determined by the BSL System based on the type of MP input, shown in the vertical scale region; the unit for this example is Volts

Time

The time from the start of the recording, the units of time are shown in the horizontal scale region along the bottom of the display

Wavefrom

Connection of data points by a straight lines

Data points can also be referred to as …

Points, sample, or data

Sample rate

The number of data points the hardware will collect in a unit of time, establishes the time interval

Baseline

A reference point for the height or depth (“amplitude”) of a waveform.

Data window

Displays the waveforms and is where you will perform your measurements and analysis.

Journal

Where you will make notes, paste extracted information from the Data window. The journal information can be exported to other programs for further analysis.

What is another name form the Data Window

Graph Window

How many waveforms can be simultaneously displayed in the Data Window

Eight

Channel boxes

Located in the toolbar above the data window, they enable you to identify the active channel and hide channels from view

How dose channel display work

The display can show one or more data channels, but only one channel can be “active” at any time

Grid

A series of horizontal and vertical lines that assist the eye with finding data positions with respect to the horizontal and vertical scales, affects all channels

Horizontal Scroll Bar

Reposition the data with respect to time

Vertical Scroll Bar

Reposition the CH 41 Clench Force waveform

Autoscale horizontal

Adjusts the horizontal scale such that the left most portion of the screen is the start of the recording, and the right most portion is the end of the recording

Zoom back

Will “undo” multiple levels of zoom

Start/End (Horizontal) and Upper/Lower (Vertical)

Establishes the boundary values to fit in the display window and is useful for highlighting meaningful segments in the waveform

Precision

Establishes the number of significant digits displayed in the Axis region

Global Grid Settings

Opens dialog for applying master grid settings for all channels

Channel Grid Settings

Opens dialog for selectively applying grid settings to one or more channels

What is the “selected area” for all measurements is the area selected by

I-bean tool

Area

Computes the total area among the waveform and the straight line that is drawn between the endpoints

BPM

Bbeats per minute (BPM) measurement, uses the start and end points of the selected area as a measurement for one beat and calculates the difference in time between the first and last selected points, then divides this value into 60 seconds/minute

Calculate

Can be used to perform a calculation using the other measurement results

Correlate

Provides the Pearson product moment correlation coefficient, r, over the selected area and reflects the extent of a linear relationship between two data sets:

Delta

Computes the difference in amplitude between the last point and the first point of the selected area

Delta S

Measurement is the difference in sample points between the end and beginning of the selected area

Delta T

Measurement is the difference in time between the end and beginning of the selected area.

Evt_amp

Extracts the value of the measurement channel at the times where events are defined. The measurement result is unitless

Evt_count

Evaluates the number of events within the selected area. The measurement result is unitless

Evt_loc

Extracts information about the times of events, the measurement result uses the units of the horizontal axis

Expression

Generates the Expression transformation dialog and offers Source “MC” Measurement Channel instead of “SC” Selected Channel to build recursive formulas

Freq

Converts the time segment between the endpoints of the selected area to frequency in cycles/sec

Intergral

Computes the integral value of the data samples between the endpoints of the selected area. This is essentially a running summation of the data

Kurtosis

Indicates the degree of peakedness in a distribution, e.g. the size of the “tails” of the distribution

Lin_reg

Computes the non-standard regression coefficient, which describes the unit change in f (x) (vertical axis values) per unit change in x (horizontal axis).

Max

The maximum measurement finds the maximum amplitude value within the selected area (including the endpoints)

Median

Shows the median value from the selected area

Mean

Computes the mean amplitude value or average of the data samples between the endpoints of the selected area and displays the average value

Min

Finds the minimum amplitude value within the selected area (including the endpoints)

Moment

Computes central variance and other higher-order moments of the data within the selected area.

P-P

(Peak-to-Peak) finds the maximum value in the selected area and subtracts the minimum value found in the selected area

Rate_mean

Extracts the mean value of the rate outputs within the selected area

Rate_median

Extracts the median value of the rate outputs within the selected area

Rate_stddv

Extracts the standard deviation value of the rate outputs within the selected area

Sample

Shows the exact sample number of the selected waveform at the cursor position

Skew

A statistical measure of the degree of asymmetry in a distribution (away from normal Gaussian distribution,)

Slope

The slope measurement uses the endpoints of the selected area to determine the difference in magnitude divided by the time interval

Stddev

(standard deviation) is a measure of the variability of data points that computes the standard deviation value of the data samples in the selected range

Sum

Extracts a mathematical sum of the amplitudes of all of the samples within the selected area

Max T

Shows the time of the data point that represents the maximum value of the data samples between the endpoints of the selected area

Median T

Shows the time of the data point that represents the median value of the selected area

Min T

Shows the time of the data point that represent the minimum value of the data samples between the endpoints of the selected area

Time

Shows the exact time of the selected waveform at the cursor position

Value

Displays the amplitude value for the channel at the point selected by the I-beam cursor

Append markers

Appear as a diamond below the marker text box and are red when active, automatically inserted when you begin each new recording segment and are marked with time data

Event markers

Appear as inverted triangles below the marker text region and are red when active, can be manually entered during or after recording

Save As

Allows saving to your school’s network or other media for access to the file outside of the lab or for sending Journal reports to your instructor

Go To Startup Wizard

Allows you to re-launch into Lessons, PRO or Startup Wizard mode without exiting the application

Open from Dropbox

Allows you to access saved lesson files stored on an online Dropbox account from any computer with BSL installed

Time stamp

The “clock” icon at the top left of the Journal window, enters the current time into the Journal window at the cursor point.

Date stamp

The“calendar” button to the right of the time stamp, enters the current time into the Journal window at the cursor point

Paste Wave Data

Writes all the points that make up the data in the selected wave area to the Journal

Print ___ plots per page

This option determines how each page will be divided up to plot the data displayed in the data window

Fit to ___ pages

This option determines how many pages to use to print what is displayed on the screen

The print software will make automatic adjustments for the ___ settings

Vertical scale and event markers

Director

Oversees the lesson procedure and gives the Recorder and Subject specific tasks to perform during the lesson recordings. The Director also keeps track of the time required for each condition.

Recorder

Tasked to insert event markers when particular tasks are requested of the Subject. The recording step will indicate which event markers to enter. Note that event marker text can be added or edited after the recording is complete

Subject

This is the person from whom data will be recorded. The Subject will need to perform the tasks as instructed by the Director. It is suggested that the Subject not look at the computer screen while data is being recorded, as there tends to be a “biofeedback” effect that can bias the heart rate.

Calibrate

The dynamic calibration procedure will automatically optimize the BSL System for the signal(s) being recorded in the lesson

Adjust Baseline

nly used in “Lesson 5 ECG I” and allows the waveform to be moved up or down in small increments to establish an exact-zero baseline