Description and measurement of circadian rhythms, Computer Graphics

The description and measurement of circadian rhythms.

  • Describe the standard method used for the recording and graphing of behavioral rhythms in animals, especially the use of double-plotted graphs, where the abscissa scale is 48 hours long.
  • Define the general terminology used to describe rhythms, including: circadian, period (tau), phase, phase relationship, nadir, acrophase.
  • Describe how light-dark cycles are manipulated in experiments, and become familiar with the abbreviations used to represent artificial and natural light-dark cycles.
  • Contrast entrained and free-running biological rhythms.
  • Understand that light has been the most reliable zeitgeber, or "time-giver" to life on the planet earth.

An actograph is a graphical representation of sleep/wake patterns.  The darkened bars are the times of activity.  The clear areas are the times of inactivity.  When viewing an actograph, you should view the X and Y axis.  The X axis is also called the abscissa.  If the actograph is single-plotted, there are 24 hours on the x-axis.  If the actograph is double-plotted, there are 48 hours on the X-axis.  The Y axis tells the number of days or hours that the data was collected.  Looking at the graph, you can tell if the organism has an endogenous clock of less than 24 hour or more than 24 hours.  If the graph slants from right to left, there are less than 24 hours in the organism's activity.  If the graph slants from left to right, there are more than 24 hours in the organism's activity. 

Assignment

Three actographs (look closely to see the labels A, B, and C). Assume that the abscissa is either 24 or 48 hours for each actograph. You are asked to write two sentences for each actograph.

First, write a single-sentence description of the actograph, without using any of the special vocabulary you just learned; state what is going on in terms that dear old Mom would understand if you were talking to her on the phone.

Second, write a more technical sentence for each in which you provide a rough estimation of tau (the duration of the period), your understanding or best guess of the labels for the X- and Y-axes, and a statement as to whether each actograph is single- or double-plotted.

Reminder: Your completed assignment will have a total of SIX sentences, two that start out with the words, "In actograph A . . ." etc. Since two of the actographs don't include numerical axes, you will have to make some guesses to complete this assignment.

Posted Date: 3/11/2013 5:17:08 AM | Location : United States







Related Discussions:- Description and measurement of circadian rhythms, Assignment Help, Ask Question on Description and measurement of circadian rhythms, Get Answer, Expert's Help, Description and measurement of circadian rhythms Discussions

Write discussion on Description and measurement of circadian rhythms
Your posts are moderated
Related Questions
Problem: (a) List four components of ‘Multimedia'. (b) Write short notes on the following: (i) itunes (ii) ipods (c) Some Multimedia development teams can have an

Polygon Representation Methods - Modeling and Rendering Any scene to be created by computer graphics may include a variety of objects, a few of them natural and manmade. Hence

Application Interlacing is utilized through all the analogue TV broadcast systems in recent use as: NTSC: 59.94 fields per second, 525 lines, still field drawn first

Sequencing of Animation Design Previously we have discussed many things regarding the traditional and current trends of computer created animation although now it is time to pr

Area-Subdivision method This method is a type of an image-space method although uses object-space operations re-ordering or sorting of surfaces as per to depth. Area sub-div

Modelling and Rendering a surface Common practice in modelling and rendering a surface is to approximate it by a polygonal surface.  By a polygonal surface we mean a surface whi

Concept Of Hyper Text And Hyper Media:- Any student, who has utilized online assist for gaming etc, will previously be familiar along with a basic component of the Web-Hypertext.Hy

Question : You have been approached to design a ‘tuck top auto-lock bottom' carton package for a high-end cosmetic jar under the brand name ‘Beauty One'. Your client asked you

Categories of Orthographic Projection Orthographic projection is additionally divided into Multi-view projection and axonometric projection, depending upon where the direction

The table as given below demonstrates possible values of such parameters for classic applications of digital video. Application                  Frame rate                  Dime