Abstract
Rapid detection of sensory changes is important for survival. We have previously used change-related cortical responses to study the change detection system and found that the generation of a change-related response was based on sensory memory and comparison processes. However, it remains unclear whether change-related cortical responses reflect processing speed. In the present study, we simultaneously recorded the auditory steady-state response (ASSR) and change-related response using magnetoencephalography to investigate the acceleration effects of sensory change events. Overall, 13 healthy human subjects (four females and nine males) completed an oddball paradigm with a sudden change in sound pressure used as the test stimulus, i.e., the control stimulus was a train of 25-ms pure tones at 75 dB for 1,200 ms, whereas the 29th sound at 700 ms of the test stimulus was replaced with a 90-dB tone. Thereafter, we compared the latency of ASSR among four probabilities of test stimulus (0, 25, 75, and 100%). For both the control and test stimulus, stronger effects of acceleration on ASSR were observed when the stimulus was rarer. This finding indicates that ASSR and change-related cortical response depend on physical changes as well as sensory memory and comparison processes. ASSR was modulated without changes in peripheral inputs, and brain areas higher than the primary cortex could be involved in exerting acceleration effects. Furthermore, the reduced latency of ASSR clearly indicated that a new sensory event increased the speed of ongoing sensory processing. Therefore, changes in the latency of ASSR are a sensitive index of accelerated processing.
Highlights
Rapid detection of changes in the sensory environment is essential
Post hoc tests revealed that the latency for the 25% condition was significantly shorter than that for the 100% (p = 0.008) and 75% (p = 0.002) conditions; there was no significant difference between the latter two probabilities (p > 0.99)
Concerning the area under the baseline curve (AUC) from 700 to 1,100 ms, the two-way analysis of variance (ANOVA) indicated that probability
Summary
Rapid detection of changes in the sensory environment is essential. one of the most important functions of sensory systems is the detection of changes. Change-Related Acceleration Effects on ASSR to new sensory conditions, investigating change-related brain activity may help us elucidate the mechanisms of preattentive activation processes in the brain in response to sensory changes To study this neural change detection system, we have previously examined change-related cortical responses that were evoked by a new sensory event (Tanaka et al, 2008, 2009a; Inui et al, 2010a,b, 2012, 2013, 2018; Nishihara et al, 2011; Takeuchi et al, 2017, 2018). An individual’s change-related cortical response can be distinctly observed using electroencephalography (EEG) or magnetoencephalography (MEG) without the individual’s active involvement These are useful tools for investigating higher brain function. Such EEG or MEG responses are anticipated to relate to faster reactions to new sensory events, it remains unclear whether change-related cortical responses reflect processing speed
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