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.

Continue to download page.


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 - lectures

  • Future engagement: 9-12 July 2018
    Lecture: The Neurobiology of Beauty at the Franklin-Wilkins Building, King's College London as part of the XII International Symposium of Functional Neuroreceptor Mapping of the Living Brain
  • Future engagement: 15-16 November 2018
    Lecture: The Neurobiology of Beauty as part of the Fresco Conference on Synaptic Plasticity, Florence, Italy
  • Future engagement: 7 December 2018
    Lecture: The Neurobiology of Aesthetic Experiences and Judgement at the Salpetriere Hospital, Paris for the French Society of Neurology
  • Future engagement: 8-14 April 2019
    Semir Zeki will give a public lecture at the National Geographic Science Festival in Rome (April 8-14, 2019). The Festival will coincide with the 500th anniversary of the death of Leonardo Da Vinci and the 50th anniversary of landing on the moon. Exact title, date and venue to be announced.

Latest news - publications

  • Recently appeared: The Rough Seas of Cortical Cartography by Semir Zeki is now available in Trends in Neurosciences
  • Recently appeared: The Bayesian-Laplacian Brain Semir Zeki, Oliver Y. Chèn bioRXiv
  • Recently appeared: Imaging the passionate stage of romantic love by dopamine dynamics by Kayo Takahashi, Kei Mizuno, Akihiro T Sasaki, Yasuhiro Wada, Masaaki Tanaka, Akira Ishii, Kanakao Tajima, Naohiro Tsuyuguchi, Kyosuke Watanabe, Semir Zeki and Yasuyoshi Watanabe is now available in Frontiers in Human Neuroscience
  • Recently appeared: A special issue of The Philosophical Transactions of the Royal Society, edited by Semir Zeki, to commemorate the 350th anniversary of the birth of this, the first peer-reviewed journal, is now online. It is entitled "Cerebral Cartography: a vision of its future" and contains, among other articles, ones giving detailed descriptions of the American, European and Japanese brain initiative programmes.
  • Now available: Semir Zeki's first book, A Vision of the Brain, can be downloaded here.
  • Now available: Splendors and Miseries of the Brain is now available in Greek and Polish (also available in Spanish, Italian and German).
  • Now available: Inner Vision by Semir Zeki.