November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
The M100: Face categorization begins within 100 ms of stimulus presentation
Author Affiliations
  • Jia Liu
    MIT, USA
Journal of Vision November 2002, Vol.2, 611. doi:10.1167/2.7.611
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      Jia Liu, Alison Harris, Nancy Kanwisher; The M100: Face categorization begins within 100 ms of stimulus presentation. Journal of Vision 2002;2(7):611. doi: 10.1167/2.7.611.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Human visual object recognition is thought to begin within 150-170 ms of stimulus onset. Here we used magnetoencephalography (MEG) to show that recognition begins substantially earlier: by 100 ms after stimulus onset MEG responses over occipitotemporal sensors are significantly higher to faces than to nonface control stimuli. The amplitude of this “M100” response is higher when a degraded face stimulus is correctly categorized as a face than when the same stimulus is incorrectly categorized, showing that the M100 reflects not simply the low-level visual features present in the stimulus, but the perceptual experience of the subject. Furthermore, the magnitude of the M100 is not correlated with correct identification of a specific face, although the magnitude of the later face-selective M170 is. Thus, categorizing a stimulus as a face apparently begins substantially earlier than identifying a specific face. More generally, by sharply reducing current estimates of the earliest latency of stimulus categorization, our findings place powerful new empirical constraints on theories of human visual recognition.

Liu, J., Harris, A., Kanwisher, N.(2002). The M100: Face categorization begins within 100 ms of stimulus presentation [Abstract]. Journal of Vision, 2( 7): 611, 611a, http://journalofvision.org/2/7/611/, doi:10.1167/2.7.611. [CrossRef]
Footnotes
 Supported by: Reed Fund and NEI grant EY13455 to N. Kanwisher
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