Dear Sundareswaran Loganathan 

please check pdf and link

cerco.ups-tlse.fr/pdf0609/dubois_j_11_these.pdf

Hi, 

the gaps mean that the amplitude of your artifact was so big, that your amplifier was saturated. 

Noise can be basically anything (power noise, monitors, mobile phone, ...). Also if you use a recording system with a cable that is connected to the head of the animal that can be very noisy. Movement artifacts are also very prominent. Can you discriminate how your noise loos like? Best wishes, Christoph

Dear Nirmala,

I do not find the PDF or Link attached in your replyl. Please send me. Thank you for the help.

Hello Christoph,

I am recording in a moving animal. Like you said ,the gaps may be because of the noise or the connection is not proper between the head of the animal and recording system . However, even after the adjustment still we find the gaps (blank space in between the continuous oscillations). Do you have anything to suggest?

PLease post a recording with calibration, your filter settings, whether you are monopolarly of bipolarly recording,  earth and reference electrodes?, electrode positions.  Do you use active or passive electrodes? We are recording LPF in free moving animals for forty years and what you describe is not normal. Christoph's answer might be very true.