257 reputation
18
bio website about.me/michael.chary
location United States
age 30
visits member for 2 years, 4 months
seen Aug 19 at 11:12

Aug
19
comment What cognitive processes occur during a mental exhaustion or 'burnout'?
How did you jump from the sympathetic and parasympathetic nervous systems to dopamine in the central nervous system? Cognitive processes such as motivation and concentration are not merely functions of the reticular activating system.
Feb
25
comment Is there a better way to describe brain activity than EEG “brain waves”
Thanks for reminding me-- it got lost in the flow. Back to it!
Dec
25
comment What is a good textbook for an undergrad Cognitive Neuroscience course?
Later versions are called "The Cognitive Neurosciences"
Oct
9
comment Is there a better way to describe brain activity than EEG “brain waves”
On people, it's usually done on neurosurgical patients who have electrodes implanted for intractable epilepsy, Parkinson's, psych disorders. They have in animals and do, at a few med centers, flexible electrodes that record a signal. Wireless can't transmit at high enough frequencies to send spike data in real time. The electrodes also have low enough impedance to pick up only a few neurons. (In part because MDs know more about what to do with EEGs and spikes are used for intraoperative localization.)
Oct
9
comment Is there a better way to describe brain activity than EEG “brain waves”
Based on the discussion in my answer, the most direct way to clarify is to ask the OP. What do you mean when you say brain activity? Subthreshold activity, spikes? Both? Something else?
Oct
9
comment Is there a better way to describe brain activity than EEG “brain waves”
Oh, I didn't think you were trying to put me down at all. In fact, your comments helped me clarify what I meant. :-)
Oct
9
comment Is there a better way to describe brain activity than EEG “brain waves”
I totally agree that a spike isn't a brain wave. But, a spike train does approximate a neuron's rate function and so many spike trains from a region can be combined to make a "population rate function". That seems to be something like a brainwave.
Oct
9
comment Is there a better way to describe brain activity than EEG “brain waves”
People do record brain activity using extracellular electrodes. The method for extracting action potentials is very different from getting local field potentials, though. If you record at a high rate, like 40 kHz, and band-pass filter, say between 300 Hz and 10 kHz, then you will see action potentials.
Oct
8
comment How do emotions influence the language structures we use?
What about semantic analysis using NLTK in Python?
Aug
25
comment How can STDP fit with reciprocal connectivity?
A synapse does not exist in isolation in the brain. That does limit how correlated the firing rates of two neurons can become. Furthermore, reciprocal connectivity is may be to the same neurons but not the same place on the neuron. For example neuron A could synapse far from B's soma but B could synapse close to A's soma.
Aug
25
comment What makes the difficulty of an arithmetic item? The operation or its length?
How do you measure difficulty? Time to complete? Accuracy over many trials?