Unwrapping of transient responses from high rate overlapping pattern electroretinograms by deconvolution

Area of Science:

• Ophthalmology
• Neuroscience
• Biomedical Engineering

Background:

• Steady-state pattern electroretinograms (PERGSS) often lose temporal information due to overlapping responses at high reversal rates.
• Extracting transient responses (PERGtr) is crucial for detailed analysis of retinal function.

Purpose of the Study:

• To develop a deconvolution method and specialized system to recover transient PERG responses (PERGtr) from high-rate PERGSS.
• To enable the extraction of temporal information previously lost in PERGSS recordings.
• To facilitate the study of retinal responses across a wide range of stimulation rates.

Main Methods:

• Developed a deconvolution algorithm and a high temporal resolution display/acquisition system.
• Employed slight jittering of reversal onsets at a given mean rate to facilitate deconvolution.
• Tested the system across eight rates, from 2.2 to 78.1 reversals per second (rps).

Main Results:

• Successfully extracted PERGtr with conventional morphology (N35-P50-N95) and earlier peaks/higher amplitudes up to 40 rps.
• Observed smaller, triphasic responses with reversed polarity at higher rates.
• Recorded oscillating potentials (OPs) at all tested rates following deconvolution.

Conclusions:

• Transient PERGs and OPs can be successfully extracted from quasi steady-state recordings using the developed deconvolution technique.
• This methodology enhances the understanding of high-rate retinal responses.
• The technique offers potential for diagnosing retinal diseases by revealing previously unobservable temporal waveform components.