<p>ASSR analysis is based on the fact that the electrophysiological responses are time locked with the stimulus repetition rate.</p>

<p>There is not one possible method of analysis. Generally spoken, ASSR analysis occurs in the spectral domain, and specifically the frequency of the stimulus repetition rate is analyzed, as well as its harmonics. For example, if the stimulus repetition rate is 100 Hz, the ASSR will occur at 100 Hz, 200 Hz, 300 Hz <em>etc</em> (Fig. 1). The base frequency (in this case, 100 Hz) will have the largest amplitude, and the harmonics decrease in amplitude. Detecting the presence of ASSR in the spectral domain means relying on amplitude and/or phase values (sometimes combined into a vector).</p>

<p><a href="https://i.sstatic.net/wLveG.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/wLveG.jpg" alt="assr"></a><br>
<sup>Fig. 1. ASSR base frequency and harmonics. Stimulus rate was 90 Hz. source: <a href="http://www.hearingreview.com/2007/11/auditory-steady-state-response-assr-a-beginners-guide/" rel="nofollow noreferrer">The Hearing Review</a></sup></p>

<p><sub><strong>Sources</strong><br>
<strong>-</strong> <a href="http://www.hearingreview.com/2007/11/auditory-steady-state-response-assr-a-beginners-guide/" rel="nofollow noreferrer">The Hearing Review, November 2007</a><br>
<strong>-</strong> <a href="http://www.audiologieboek.nl/htm/hfd4/4-5-3.htm" rel="nofollow noreferrer">Audiology Book (in Dutch)</a></sub></p>

CC BY-SA 3.0
2017-02-06T08:58:17.520Z
2017-02-06T10:07:22.387Z
2017-02-06T10:07:22.387Z
AliceD
<p>How does one usually go about analyzing the auditory steady state response (ASSR)? I have data where speech was amplitude modulated to a 40 Hz sine tone. There's 3.5 minutes of data; should I just take the FFT or do some averaging first? What is the usual process? The data has been already preprocessed.</p>

<eeg><hearing><electrophysiology><signal-processing>
How to analyze auditory steady state responses?
newwb
# How to analyze auditory steady state responses?

(Asked by: username_0 on 2013-06-26)

How does one usually go about analyzing the auditory steady state response (ASSR)? I have data where speech was amplitude modulated to a 40 Hz sine tone. There's 3.5 minutes of data; should I just take the FFT or do some averaging first? What is the usual process? The data has been already preprocessed.

**Tags:** eeg, hearing, electrophysiology, signal-processing


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## 1 answers

### Answer by username_1 on 2017-02-06. Score: 1

ASSR analysis is based on the fact that the electrophysiological responses are time locked with the stimulus repetition rate.

There is not one possible method of analysis. Generally spoken, ASSR analysis occurs in the spectral domain, and specifically the frequency of the stimulus repetition rate is analyzed, as well as its harmonics. For example, if the stimulus repetition rate is 100 Hz, the ASSR will occur at 100 Hz, 200 Hz, 300 Hz *etc* (Fig. 1). The base frequency (in this case, 100 Hz) will have the largest amplitude, and the harmonics decrease in amplitude. Detecting the presence of ASSR in the spectral domain means relying on amplitude and/or phase values (sometimes combined into a vector).

[![assr](https://i.sstatic.net/wLveG.jpg)](https://i.sstatic.net/wLveG.jpg)  
Fig. 1. ASSR base frequency and harmonics. Stimulus rate was 90 Hz. source: [The Hearing Review](http://www.hearingreview.com/2007/11/auditory-steady-state-response-assr-a-beginners-guide/)

**Sources**  
**-** [The Hearing Review, November 2007](http://www.hearingreview.com/2007/11/auditory-steady-state-response-assr-a-beginners-guide/)  
**-** [Audiology Book (in Dutch)](http://www.audiologieboek.nl/htm/hfd4/4-5-3.htm)


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