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Physics of perception

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Next student seminar :
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Experimental Internship - Undergraduate program
Master ICFP first year Internship

News : ICFP Research seminars
November 14 - 18, 2022 :

All information about the program

Contact us - Student support and Graduate School office :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

Faculty : Thierry Mora, Pascal Martin

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ECTS credits : 3

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Description :

Sensory systems strike us by their exquisite sensitivity, which is often close to the limit set by physics. Our eyes are sensitive to single photons. Likewise, our ears can detect sound-evoked vibrations that can be smaller than the thermal motion of the ear’s inner structures. In addition, our senses also show sharp selectivity. We can indeed visualize the position of objects with a higher precision than the distance between retinal photoreceptors, and tell the difference between sounds that differ only by 0.02% in frequency. Finally, the dynamical range of perception can be enormous, spanning up to 12 orders of magnitude of sound intensities in the case of hearing. These characteristics impose stringent physical constraints on transduction, filtering, noise rejection, and amplification of the input by receptor sensory cells of the body.

In this course, we will focus on the particular examples of vision and hearing to explore the physical mechanisms underlying the extraordinary performances of our senses. We will explore the various scales and stages of processing of sensory stimuli, from the cochlea and its cellular microphones in hearing, and from photo-receptors in vision, to basic neural processing. We will see that familiar concepts from non-linear dynamics and statistical mechanics (Hopf bifurcations, resonance, critical transitions,…) can shed light on the mechanisms of active amplification, compression, and efficient representation of sensory signals. In return, we will identify general physical principles of sensory detection.

Quick links

Next student seminar :
Access to the program

Here you can find information about your internships:
Experimental Internship - Undergraduate program
Master ICFP first year Internship

News : ICFP Research seminars
November 14 - 18, 2022 :

All information about the program

Contact us - Student support and Graduate School office :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr