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Informed Discussion of Beekeeping Issues and Bee Biology

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Subject:
From:
Dick Allen <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Fri, 17 Jan 2003 16:53:46 -0500
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>There are multiple references citing the exact nature of bee vision, and
listing the exact types of sensors that bees have.
>Do a web search on "ommatidia" and "bee", and read all about them.

Do any of the references explain how a bee perceives what it sees?

“It is well known that bees recognize objects with their compound eyes,
that they perceive movement and distinguish colors and forms, *but we do
not know how visual stimuli are registered in their nervous system*. [my
italics] It is particularly difficult to understand how colors are
distinguished, since there is no known mechanism in the insect eye
corresponding to the rods and cones of a vertebrate eye. The rhabdom
disperses whatever wave lengths of physical light it receives into the
retinular cells, and with unpolarized light all the cells must be
stimulated alike. Different wave lengths might be supposed to give
different degrees of stimulation, but not different kinds of stimulation,
and it seems doubtful if degrees of stimulation corresponding with wave
lengths of light would be perceived as different colors. Yet experiments
leave no doubt that bees distinguish colors by sight, at least from the red
into the ultraviolet. *Physiologists, however, cannot explain how colors
are registered in the human brain* [again, my italics. Do we now know?].
The perception of form by the compound eyes is perhaps less difficult to
understand, since the ommatidia diverge in all directions from the optic
lobes and a pattern of the visual field might be registered in them. The
compound eye, however, seems best constructed for the perception of
movement, and most insects are quickly aware of moving objects.”

My apologies for causing any cognitive astigmatism. In my 20/20 hindsight I
realize that more of Snodgrass’s explanation given in his “Anatomy of the
Honey Bee” should have been quoted.

Is there anything out there in cyberspace to explain how a bee perceives
what it sees?

Regards,
Dick Allen

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