Cogent 2000

Cogent 2000 is a MATLAB Toolbox for presenting stimuli and recording responses with precise timing. Cogent 2000 incorporates Cogent Graphics and provides additional utilities for the manipulation of sound, keyboard, mouse, joystick, serial port, parallel port, subject responses and physiological monitoring hardware. For fMRI experiments, Cogent 2000 can be configured to receive synchronisation pulses from a scanner allowing experimental timing to be tightly coupled with image acquisition.

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Demonstrations

Here you can view some movies illustrating some of the visual and auditory presentation capabilities of Cogent. The sample scripts demonstrate how easily these experiments can be programmed. These movies are not actual experiments but simple illustrations of the type of stimuli that could be used in a psychophysical or neuroimaging environment. The subject responses can be measured and logged and the timing of the Cogent scripts can be controlled from within the script or by external hardware (e.g. by an MRI scanner).

Click on the small image to view the movie. Be warned that the movie files are quite large (up to 2Mb) and may take some time to download.

Faces video

This example is a simple block design experiment to compare the subject's response to famous faces with a baseline condition of scrambled faces. The script demonstrates how the images contained in a series of graphics files can be displayed using Cogent 2000. Source code.

Sounds video

This example is a simple block design experiment to compare the subject's response to blocks of words during which semantic processing is manipulated by the question associated with each block. The script demonstrates how a set of sound files can be played using Cogent 2000. Source code.

Stroop video

This example is a single event-type experiment to investigate the subject's attentional response to a mismatch compared with a match between word colour and meaning. The script demonstrates how strings of different colours and sizes can be presented using Cogent 2000. Source code.

Latest news

  • Coming soon: Parallel processing in the brain's visual form system: An fMRI study by Yoshihito Shigihara and Semir Zeki will soon be published in Frontiers in Human Neuroscience
  • Now available: Masking reveals parallel form systems in the visual brain by Yu Tung Lo and Semir Zeki in Frontiers in Human Neuroscience
  • Now available: The role of parietal cortex in the formation of colour and motion based concepts by Samuel W. Cheadle and Semir Zeki in Frontiers in Human Neuroscience
  • Now available: Semir Zeki's first book, A Vision of the Brain, can be downloaded here.
  • Upcoming lecture 15-16/11/14 Warsaw (exact timing to be announced): A talk at the "Aspects of Neuroscience" conference
  • Upcoming lecture 05-06/12/14 Heidelberg (exact timing to be announced): Keynote address at the Helmholtz Foundation, Heidelberg University
  • Now available: Perceptual asynchrony for motion by Yu Tung Lo and Semir Zeki in Frontiers in Human Neuroscience.
  • Now available: Varieties of perceptual instability and their neural correlates by Tomohiro Ishizu and Semir Zeki in Neuroimage.
  • Now available: The experience of mathematical beauty and its neural correlates by Semir Zeki, John Romaya, Dionigi Benincasa and Sir Michael Atiyah in Frontiers in Human Neuroscience.
  • Now available: The "Visual Shock" of Francis Bacon: an essay in neuroesthetics by Semir Zeki and Tomohiro Ishizu in Frontiers in Human Neuroscience.
  • Now available: Clive Bell's "Significant Form" and the neurobiology of aesthetics by Semir Zeki is now available under open access in Frontiers in Human Neuroscience.
  • Now available: The brain's specialized systems for aesthetic and perceptual judgments by Semir Zeki and Tomohiro Ishizu is now available under open access in the European Journal of Neuroscience.
  • Now available: Parallelism in the brain's visual form system by Semir Zeki and Yoshihito Shigihara is now available in the European Journal of Neuroscience.
  • Now available: Splendors and Miseries of the Brain is now available in Greek.