Billig Flashcards
What is the role of theta oscillations with the hippocampus?
For navigation and cooridnates place cells
What is the range for theta waves
4-8 hz
what are the other things hippocampal and entorhinal cells code for?
1.Tone frequency
2.Virtual and imaged space
3.Body part length
What was the set up with the mouse and pure tone
Rat holds down lever and releases it when it hits target frequnecy to get reward
limitation of his rat task
artifical sounds
what did raster plot reveal about navigation and attention for rat task
- Partiular cells respond to sounds to help navigation
- rat needs to pay attention for cells to fire and help navigation
link between the cells firing and location
links adutiroy and spatial navigation.
the cells that fired to a particular frequency were mapped to a specifc place on grid-like grid cells
what did they use to get single neruon activity
microwires in intracranial recordings.
what was the issue with single trials using the time domain
they aren’t time locked to stimlus- so when they averaged the activity it would cancel out
How did they deal with the time locked freeuncy issue of TD
Moved into frequency domain so that averges of the tirals did not cancel out.
where is the theta on the spectrogram
on the 4-8 hz lower area of spectrogram
AC neruon fiirng during adjustment task
high firing when target frequnecy is heard and high firing when adjustement period occurs.
(diverse- some fire at the beginning of maintence period)
Hippocmapal neruon fiirng duirng adjustment period
Overall less firing than AC neurons.
HIgher firing at feedback period (when they are told their doing well or not-kinky)
what do most hippocampal neruons do during adjustment task
most are suppressing thier activity- especailly during adjustment period
what was the overall role of hippocampal neruons duirng adjustment task?
TIME CELLS
Hippocampal cell firing is consistnly linked ot specific time points of task so specifc hippocampal cell is fiirng at the beginning of task.
Are hippocapal cells responding to particular sound frequency?
No
what frequency of hippocampal neruon increases during working memory for sound?
delta-theta - low frequencyies 4-8 hz
Acoustic boundary for hippocampal neruons
Hippocampal cells respond to different types of boundires (hard, soft) while watching a movie.
These cells also act the same for acoustic boudaries
