Study type: Medical/biological study (experimental study)

Pulse modulated and continuous wave microwave radiation yield equivalent changes in operant behavior of rodents med./bio.

By: Lebovitz RM
Published in: Physiol Behav 1983; 30 (6): 891-898
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Aim of study (acc. to author and editor)

To study the effect of pulse modulated and continuous wave (CW) microwave irradiation on operant behavior in rats. The aim of the study was to determine if exposure to continuous wave (CW) microwave irradiation would yield the same enhancement of stimulus control as did pulse-modulated microwave irradiation and whether the magnitude of this effect would be comparable for the two modulation profiles.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 1.3 GHz
Modulation type: CW
Exposure duration: repeated daily exposure, 3 h/day
Exposure 2: 1.3 GHz
Modulation type: CW
Exposure duration: repeated daily exposure, 3 h/day
Exposure 3: 1.3 GHz
Modulation type: pulsed
Exposure duration: repeated daily exposure, 3 h/day
Exposure 4: 1.3 GHz
Modulation type: pulsed
Exposure duration: repeated daily exposure, 3 h/day

Exposure 1

Main characteristics
Frequency 1.3 GHz
Exposure duration repeated daily exposure, 3 h/day
Modulation
Modulation type CW
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Additional info the Irradiation facility consisted of an array of 32 identical waveguides, of which half were used for sham exposure
Parameters
Measurand Value Type Method Mass Remarks
SAR 5.9 mW/g mean calculated unspecified -

Exposure 2

Main characteristics
Frequency 1.3 GHz
Exposure duration repeated daily exposure, 3 h/day
Modulation
Modulation type CW
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 3.5 mW/g mean calculated unspecified -

Exposure 3

Main characteristics
Frequency 1.3 GHz
Exposure duration repeated daily exposure, 3 h/day
Modulation
Modulation type pulsed
Pulse width 1 µs
Packets per second 600
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 6.7 mW/g mean calculated unspecified -

Exposure 4

Main characteristics
Frequency 1.3 GHz
Exposure duration repeated daily exposure, 3 h/day
Modulation
Modulation type pulsed
Pulse width 1 µs
Packets per second 600
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 3.4 mW/g mean calculated unspecified -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

With comparable microwave irradiation dose rates, continuous wave (CW) and pulsed modulated (PM) microwave irradiation (5.8 and 6.7 mW/g, respectively) were equally effective in reducing response rates during both the fixed-ratio and the timeout components. Dose rates of this order were associated with an increase in body temperature of 0.5 to 1.0°C. At 3.6 mW/g, whereas the mean rates of fixed-ratio responding were unchanged, the rates of responding during timeout were decreased significantly (again, CW and PM microwave irradiation yielded essentially equivalent data). This microwave irradiation dose rate was not accompanied by a measurable elevation in whole-body temperature.

Study character:

Study funded by