Article

On the use of microwave radar devices in chronobiology studies: An application withPeriplaneta americana

Behavior Research Methods (impact factor: 2.12). 04/2012; 37(3):522-527. DOI:10.3758/BF03192723 pp.522-527

ABSTRACT Modified motion detectors can be used to monitor locomotor activity and measure endogenous rhythms. Although these devices
can help monitor insects in their home cages, the small size of the animals requires a very short wavelength detector. We
modified a commercial microwave-based detection device, connected the detector’s output to the digital input of a computer,
and validated the device by recording circadian and ultradian rhythms.Periplaneta americana were housed in individual cages, and their activity was monitored at 18°C and subsequently at 28°C in constant darkness.
Time series were analyzed by a discrete Fourier transform and a chi-square periodogram. Q10 values and the circadian free-running period confirmed the data reported in the literature, validating the apparatus. Moreover,
the spectral analysis and periodogram revealed the presence of ultradian rhythmicity in the range of 1–8 h.

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Keywords

chi-square periodogram
 
circadian free-running period
 
commercial microwave-based detection device
 
constant darkness
 
digital input
 
discrete Fourier
 
insects
 
Modified motion detectors
 
periodogram
 
Q10 values
 
short wavelength detector
 
small size
 
spectral analysis
 
ultradian rhythmicity
 
ultradian rhythms.Periplaneta americana
 
validated