Multiple Auditory Steady-state Responses (MASTER): Stimulus and Recording Parameters

Aerial audiograms of several California sea lions (Zalophus californianus) and Steller sea lions (Eumetopias jubatus) measured using single and multiple simultaneous auditory steady-state response methods

“…This finding is consistent with previous studies involving humans John et al, 1998) and dolphins (Branstetter et al, 2008;Finneran et al, 2008) that have not found interactions using one-octave spacing.…”

“…The use of multiple simultaneous frequencies allows the hearing threshold at each frequency to be assessed simultaneously. The multiple ASSR method has been shown to produce hearing sensitivity measurements comparable to those of the single ASSR method in both humans John et al, 1998;John et al, 2002b) and dolphins Finneran et al, 2008). This procedure leads to a reduced testing time relative to the single ASSR method, and makes it a desirable choice in situations where testing time is limited, such as pinniped anesthetic procedures (Haulena and Heath, 2001).…”

“…This procedure leads to a reduced testing time relative to the single ASSR method, and makes it a desirable choice in situations where testing time is limited, such as pinniped anesthetic procedures (Haulena and Heath, 2001). Although close spacing of frequency components in multiple ASSR procedures can lead to interactions that confound threshold estimation, one-octave spacing of test frequencies appears to be sufficient for threshold measurements with humans and dolphins John et al, 1998;Branstetter et al, 2008).…”

“…Although ASSR audiometry was originally conducted by presenting one test frequency at a time, more recent studies have shown that the simultaneous presentation of multiple sinusoidally amplitude-modulated (SAM) tones with unique center and modulation frequencies elicits ASSRs that are phase-locked to each unique modulation rate John et al, 1998). The use of multiple simultaneous frequencies allows the hearing threshold at each frequency to be assessed simultaneously.…”

Physiological evidence for auditory modulation filterbanks: Cortical responses to concurrent modulations

“…Such EEG and MEG signals, when evoked by stationary modulated sounds can be characterized by the auditory steady state response (aSSR), the response component at the same frequency as the stimulus modulation frequency (e.g., Wang et al, 2012). Speech typically contains multiple concurrent modulations, but EEG and MEG studies of concurrent modulations have typically focused on rates far above 20 Hz (Lins and Picton, 1995;John et al, 1998;Draganova et al, 2002 Two broad categories of theories have been proposed to explain auditory modulation perception. Earlier approaches proposed that the demodulation of input signals is induced by half-wave rectification and compressive processes occurring at the periphery.…”