h1. Cell Types Data


h1. Searching the Database

With the initial launch of the Allen Cell Types Database, we include electrophysiological recordings from 248 individual cells,


h2. Filters

h2. Cell Feature Filters

h2. Stimulus Types


Different sets of stimulation waveforms were used in order to:

{fancy-bullets:image=circle} Interrogate intrinsic membrane mechanisms that underlie the input/output function of neurons
## Linear and non-linear subthreshold properties
## Action potential initiation and propagation
## Afterhyperpolarization/afterdepolarization
# Understand aspects of neural response properties in vivo
## Stimulation frequency dependence (theta vs. gamma) of spike initiation mechanisms
# Ion channel states due to different resting potentials in vivo
# Construct and test computational models of varying complexity emulating the neural response to stereotyped stimuli
## Generalized leaky-integrate-and-fire (GLIF) models
## Biophysically and morphologically realistic conductance-based compartmental models{fancy-bullets}



h2. Neuronal Models

The Allen Cell Types Database contains two types of neuronal models:  perisomatic biophysical models and generalized leaky integrate-and-fire  (GLIF) models.  These models attempt to mathematically reproduce a  cell's recorded response to a current injection.  The perisomatic  biophysical models take into account dendritic morphological structure,  whereas GLIF models are simple point neuron models which represent the  neuron as a single compartment.

There are five levels of GLIF models with increasing levels of  complexity.  The most basic model is a simple leaky integrate-and-fire  equation.  More advanced GLIFs attempt to model variable spike  threshold, afterspike currents, and threshold adaptation. 
|| Model Name \\ || Description \\ ||
| 1 Leaky Integrate and Fire (LIF) \\ | Standard circuit representation of a resistor and capacitor in parallel with a leaky membrane. \\ |
| 2 LIF + Reset Rules (LIF-R) \\ | LIF with biologically-derived threshold and voltage reset rules in addition to a biologically derived threshold decay. \\ |
| 3 LIF + Afterspike Currents (LIF-ASC) \\ | LIF with spike-induced currents to model long-term effects of voltage-activated ion channels. \\ |
| 4 LIF-R + Afterspike Currents (LIF-R-ASC) \\ | LIF with additional Reset Rules and Afterspike Currents. \\ |
| 5 LIF-R-ASC + Threshold Adaptation (LIF-R-ASC-A) \\ | All of the above, with an additional voltage-dependent component of threshold. \\ |
| Biophysical, perisomatic \\ | Models with active conductances at the soma and passive dendritic morphology based on full 3D reconstruction. |

h3. Generalized Leaky-Integrate-and-Fire (GLIF) Models

h3. Biophysical Models - Perisomatic