Imagine that $z_n$ represents the firing rate in time step $n$
of a neuron in a monkey's brain. At time step zero, either a
banana or a stick is shown briefly to the monkey. If the banana
was shown, the neuron starts firing at a rate $z_0$ of about 1.2.
If a stick was shown, the neuron starts firing at a rate $z_0$ of
Imagine that you don't know if the monkey was shown a stick or a banana at time step zero. However, after one of these was briefly shown to the monkey, the firing rate of the neuron has evolved for many time steps, and now the neuron is firing at a rate
$z_n$ of about 2. Was the monkey shown a banana or a stick?
Justify your answer using the results from the first two parts.