Flashcards in Toad Prey Capture Deck (6)
Loading flashcards...
1
Nervous System
eyes- optic nerve- tectum- target areas
2
sign stimuli
horizontal= prey
vertical= ignored
3
Ewert
used turn tables to test effectiveness of stimuli
-toad sat in middle and stimuli moved around it
-if interested it would turn and try and follow it
-rate of turning is a proxy measure for stimuli effectiveness
-combination of shape and movement is important
- toad generalizes dark/light and fast/slow
- looked for responsible neuron outside brain
4
Retinal Ganglion Cells (RGCs)
have complex responses to size/movement/colour
2 synapses from retina
detect images such as light/dark dots/edges in larger receptive field
5
Connection scheme
2 RGCs go to pretectum and connect to TH3 neurons which signals danger
2RGCs go to layer 5 and signal movement but not specifically worms
T5(1) excited T5(2) which signals prey
T5(2)s also inhibited by TH3s
Toad with damaged pretectum attack any moving object- evidence of inhibition of t5(2) by TH3
6