Scatter Plot of Local Minimums

I'm trying to create a scatter plot using the local minima of the graph. However, it also marks a bunch of other points that are not minima. Please kindly let me know what is wrong with my code.

threshold = -0.0001;
[pks,locs] = findpeaks(-neural.spikes,'MinPeakHeight',abs(threshold));
figure
plot(neural.Time,neural.spikes); hold on
line([min(neural.Time) max(neural.Time)],[threshold threshold],'color','r','LineWidth',1)

[KSSV]

You specify the number of peaks you want, plot and then see.

[Chunru]

Zoom in to your data to see if there is multiple peaks.