Markus Ostarek

Publications

Displaying 1 - 3 of 3
  • Lima, C. F., Lavan, N., Evans, S., Agnew, Z., Halpern, A. R., Shanmugalingam, P., Meekings, S., Boebinger, D., Ostarek, M., McGettigan, C., Warren, J. E., & Scott, S. K. (2015). Feel the Noise: Relating individual differences in auditory imagery to the structure and function of sensorimotor systems. Cerebral Cortex., 2015(25), 4638-4650. doi:10.1093/cercor/bhv134.

    Abstract

    Humans can generate mental auditory images of voices or songs, sometimes perceiving them almost as vividly as perceptual experiences. The functional networks supporting auditory imagery have been described, but less is known about the systems associated with interindividual differences in auditory imagery. Combining voxel-based morphometry and fMRI, we examined the structural basis of interindividual differences in how auditory images are subjectively perceived, and explored associations between auditory imagery, sensory-based processing, and visual imagery. Vividness of auditory imagery correlated with gray matter volume in the supplementary motor area (SMA), parietal cortex, medial superior frontal gyrus, and middle frontal gyrus. An analysis of functional responses to different types of human vocalizations revealed that the SMA and parietal sites that predict imagery are also modulated by sound type. Using representational similarity analysis, we found that higher representational specificity of heard sounds in SMA predicts vividness of imagery, indicating a mechanistic link between sensory- and imagery-based processing in sensorimotor cortex. Vividness of imagery in the visual domain also correlated with SMA structure, and with auditory imagery scores. Altogether, these findings provide evidence for a signature of imagery in brain structure, and highlight a common role of perceptual–motor interactions for processing heard and internally generated auditory information.
  • Meekings, S., Boebinger, D., Evans, S., Lima, C. F., Chen, S., Ostarek, M., & Scott, S. K. (2015). Do we know what we’re saying? The roles of attention and sensory information during speech production. Psychological Science, 26(12), 1975-1977. doi:10.1177/0956797614563766.
  • Evans, S., McGettigan, C., Agnew, Z., Rosen, S., Cesar, L., Boebinger, D., Ostarek, M., Chen, S. H., Richards, A., Meekins, S., & Scott, S. K. (2014). The neural basis of informational and energetic masking effects in the perception and production of speech [abstract]. The Journal of the Acoustical Society of America, 136(4), 2243. doi:10.1121/1.4900096.

    Abstract

    When we have spoken conversations, it is usually in the context of competing sounds within our environment. Speech can be masked by many different kinds of sounds, for example, machinery noise and the speech of others, and these different sounds place differing demands on cognitive resources. In this talk, I will present data from a series of functional magnetic resonance imaging (fMRI) studies in which the informational properties of background sounds have been manipulated to make them more or less similar to speech. I will demonstrate the neural effects associated with speaking over and listening to these sounds, and demonstrate how in perception these effects are modulated by the age of the listener. The results will be interpreted within a framework of auditory processing developed from primate neurophysiology and human functional imaging work (Rauschecker and Scott 2009).

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