[Neuroscience] Re: Wherefore art thou Neuron Code?

Glen M. Sizemore via neur-sci%40net.bio.net (by gmsizemore2 from yahoo.com)
Tue Apr 10 04:34:24 EST 2007

"Benjamin" <Benjamin from verizon.net> wrote in message 
news:zCGSh.6251$FC5.2247 from trndny06...

"Glen M. Sizemore" <gmsizemore2 from yahoo.com> wrote in message
> news:4618d1a3$0$22574$ed362ca5 from nr2.newsreader.com...


> The left-key is always-green after it is
> pecked, and its contingencies always
> have longer-feeding-'time' and short-
> er-delay-'time' built-into them [relative
> to the contingencies of the right-key [in
> 2., above] when the right-key is red.

I don't think you understand how the procedure works. If the right key is 
pecked, BOTH keys are illuminated after t s, one red, the other green, if 
the left key is pecked, only the green option is available.

> When the right-key is green, it's contin-
> gencies are the same as those which
> always occur when the left-[always-
> green]-key is pecked.

> When the right-key is red, it's contingen-
> cies yield a shorter-feeding-'time' and
> a longer-delay, relative to the left-[always-
> green]-key -- which the pigeon experienc-
> es as a 'negative' condition, relative to
> 'the' green-key [[left or right].

This is not correct - but I don't know which "delay" you are talking about 
(what I am calling the delay or the ITI). When both red and green are 
illuminated (after a right key peck in the "initial link" and the passage of 
t s,) pecking the red key produces access to food after 1.0 s, while pecking 
green yields food after 4.0 s. Notice also that the ITI is chosen such that 
the delay to food, food access duration, and ITI sum to 24.0 s. So, no 
matter what choices the bird makes, if it makes them fairly quickly, it will 
get some food every 24.0 s (plus the time it takes to make the pecks).


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