auditory figure ground .
“An important perceptual characteristic of the SFG stimulus is the rapid buildup rate (the time required to segregate the figure from the background). For coherence levels of four components and above, as few as seven consecutive chords (a total of 350 ms) are sufficient to reach ceiling detection performance (Fig. 2). This is in contrast to the longer buildup time (∼2000 ms) reported in many brain imaging or electrophysiological experiments of streaming ”
Our results implicate the STS in the stimulus-driven partitioning of grouped components into “figure” and “ground.” Previous studies suggest the involvement of STS in the perception of complex stimuli with a stochastic structure where different specific stimuli can fall into the same perceptual category. The area has been implicated in the analysis of spectral shape (Warren et al., 2005), changing spectrum over time (Overath et al., 2008), and detecting increasing changes in spectrotemporal coherence within acoustic “textures” (Overath et al., 2010). Together, these studies point to a role for STS in the abstraction of features over frequency–time space relevant to the perception of distinct categories. STS is also involved in the analysis of natural categories associated with semantic labels, such as voices (Belin et al., 2000; Kriegstein and Giraud, 2004).