RETINAL IMAGE ? by claude19

Fractal • Atmosphere/Mood • posted on Oct 30, 2008

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Description

Un stimulus visuel doit posséder certaines caractéristiques minimales pour provoquer une réaction biologique des photo-récepteurs ou une sensation consciente de lumière. Sinon, un sujet ne voit rien, même s’il y a effectivement signal et on dit de ce dernier qu’il est subliminal, c’est-à-dire en deça du seuil de la sensation. Mais qu’est-ce donc que le seuil? Distinguons d’abord le seuil bio-physiologique du seuil psychologique. Le seuil bio-physiologique est le point en deça duquel le système bio-physiologique réagira dans moins de 50% des cas; le seuil psychologique est le point en deça duquel un stimulus sera perçu dans moins de 50% des cas. Un seul photon peut déclencher un bâtonnet; le seuil bio-physiologique de la vision est donc de plus ou moins un photon. Mais cela ne veut pas dire qu’il y aura eu sensation de lumière chez un sujet; pour y arriver, il faudra qu’une dizaine de bâtonnets au moins réagissent et alors seulement, le sujet aura vu de la lumière. Le seuil psychologique est donc d’une dizaine de photons. A visual stimulus must have certain minimal characteristics for to cause a biological reaction of the photoreceivers or a feeling conscious of light. If not, a subject does not see anything, even if there is indeed signal and one says of this last that it is subliminal, i.e. in on this side threshold of the feeling. But what is this thus that the threshold? Let us distinguish initially the bio-physiological threshold from the psychological threshold. The bio-physiological threshold is the point in on this side which bio-physiological system will react in less than 50% of the cases; the psychological threshold is the point in on this side which a stimulus will be perceived in less than 50% of the cases. One only photon can start a stick; the bio-physiological threshold of the vision is thus of more or less a photon. But that does not want to say that there will have been feeling of light at a subject; to arrive there, it will be necessary that ten sticks at least react and then only, the subject will have seen light. The psychological threshold is thus of ten photons.

Comments (17)

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carlx

12:05PM | Thu, 30 October 2008

Very beautiful abstract composition, Claude!!!

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leanndra

12:26PM | Thu, 30 October 2008

a great abstract that has a sense of the eye in its shape. Yes, images affect us on both levels. We have to see to be able to enjoy,(or dislike) and to interpret what we are able to see. I like this. Lea

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