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function dimensions = PhotoreceptorDimensions(receptorTypes,whichDimension,species,source)
% dimensions = PhotoreceptorDimensions(receptorTypes,whichDimension,species,source)
%
% Return estimates of photoreceptor dimensions.
%
% Allowable receptor types depend on species and source, but the general
% list is:
% SCone, MCone, LCone, FovealSCone, FovealMCone, FovealLCone, Rod.
%
% The type argument may be a single string or a cell array of strings. If it
% is an array, a column vector of values is returned.
%
% The foveal version of cone types is sensible only for primates. Not all
% estimate sources support all receptor types.
%
% Note that the following three numbers are overdetermined: photopigment
% specific density (sd), photopigment axial density (ad), and outer segment
% length osl. In particular, ad = sd*osl. Depending on the measurement
% method, different sources provide different pairs of these numbers.
% We have attempted to enforce this consistency in the set of routines
% PhotopigmentSpecificDensity, PhotopigmentAxialDensity, and PhotoreceptorDimensions.
% That is to say, for the same source, species, and type, you should get
% a consistent triplet of numbers.
%
% Argument whichDimension may take on values:
% OSdiam, ISdiam, OSlength.
%
% Supported species:
% Human (Default), GuineaPig, Dog
%
% Supported sources:
% Rodeick (Default).
% CVRL (Human Cone OS length)
% Hendrickson (Human Rod OS length)
% SterlingLab (GuineaPig dimensions).
% Generic.
% PennDog (Dog dimensions).
%
% The Generic type returns a single number for all species/type.
%
% 7/11/03 dhb Wrote it.
% 12/04/07 dhb Added dog but with placeholder numbers.
% Fill in defaults
if (nargin < 3 || isempty(species))
species = 'Human';
end
if (nargin < 4 || isempty(source))
source = 'Rodieck';
end
% Fill in specific density according to specified source
if (iscell(receptorTypes))
dimensions = zeros(length(receptorTypes),1);
else
dimensions = zeros(1,1);
end
for i = 1:length(dimensions)
if (iscell(receptorTypes))
type = receptorTypes{i};
elseif (i == 1)
type = receptorTypes;
else
error('Argument receptorTypes must be a string or a cell array of strings');
end
switch (source)
case {'Generic'}
switch (whichDimension)
case 'OSlength'
dimensions(i) = 32;
case 'OSdiam'
dimensions(i) = 2;
case 'ISdiam'
dimensions(i) = 2;
otherwise
error('Unsupported dimension requested');
end
% Numbers we use for dog eyes at Penn. Got these from
% Gus Aguirre. See emails sent about 12/5/07.
case ('PennDog')
switch (species)
case {'Dog'}
switch (whichDimension)
case 'OSlength',
switch (type)
case {'LCone', 'SCone'}
dimensions(i) = 13;
case {'Rod'}
dimensions(i) = 13.5;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
case 'ISdiam'
switch (type)
case {'LCone', 'SCone'}
dimensions(i) = 2;
case {'Rod'}
dimensions(i) = 2;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
case 'OSdiam'
switch (type)
case {'LCone', 'SCone'}
dimensions(i) = 1.25;
case {'Rod'}
dimensions(i) = 1;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
otherwise,
error(sprintf('Unsupported dimension %s requested',whichDimension));
end
otherwise,
error(sprintf('%s estimates not available for species %s',source,species));
end
% From Rodieck's "standard observer", Appendix B
% in The First Steps of Seeing.
case ('Rodieck')
switch (species)
case {'Human'}
switch (whichDimension)
case 'OSlength',
switch (type)
case {'FovealLCone', 'FovealMCone', 'FovealSCone'}
dimensions(i) = 33;
case {'Rod'}
dimensions(i) = 31.2;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
case 'ISdiam'
switch (type)
case {'FovealLCone', 'FovealMCone', 'FovealSCone'}
dimensions(i) = 2.3;
case {'Rod'}
dimensions(i) = 2.22;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
otherwise,
error(sprintf('Unsupported dimension %s requested',whichDimension));
end
otherwise,
error(sprintf('%s estimates not available for species %s',source,species));
end
% These numbers are my encapsulations of CVRL's summary of a variety of data.
% See CVRL summary text at:
% http://cvrl.ioo.ucl.ac.uk/database/text/intros/introlength.htm.
case {'CVRL'}
switch (species)
case {'Human'}
switch (whichDimension)
case 'OSlength',
switch (type)
case {'FovealLCone', 'FovealMCone'}
dimensions(i) = 35.5;
case {'FovealSCone'}
dimensions(i) = 35.5*0.95;
case {'LCone', 'MCone'}
dimensions(i) = 18;
case {'SCone'}
dimensions(i) = 18*0.82;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
otherwise,
error(sprintf('Unsupported dimension %s requested',whichDimension));
end
otherwise,
error(sprintf('%s estimates not available for species %s',source,species));
end
% From Hendrickson and Drucker, numbers provided at CVRL database:
% http://cvrl.ioo.ucl.ac.uk/database/text/outseg/length.htm. 40 um
% is the number provided for mid-peripheral rods, 40-45 is cited for
% parafoveal rods. This routines returns 40.
case {'Hendrickson'}
switch (species)
case {'Human'}
switch (whichDimension)
case 'OSlength',
switch (type)
case {'Rod'}
dimensions(i) = 40;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
otherwise,
error(sprintf('Unsupported dimension %s requested',whichDimension));
end
otherwise,
error(sprintf('%s estimates not available for species %s',source,species));
end
% These are values that Lu Yin provided, based on unpublished
% measurements used in the Sterling lab.
case {'SterlingLab'}
switch (species)
case {'GuineaPig'}
switch (whichDimension)
case 'OSdiam',
switch (type)
case {'LCone', 'MCone', 'SCone'}
dimensions(i) = 2;
case 'Rod'
dimensions(i) = 2;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
case 'ISdiam',
switch (type)
case {'LCone', 'MCone', 'SCone'}
dimensions(i) = 2.8;
case 'Rod'
dimensions(i) = 2.4;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
case 'OSlength',
switch (type)
case {'LCone', 'MCone', 'SCone'}
dimensions(i) = 8;
case 'Rod'
dimensions(i) = 16.2;
otherwise,
error(sprintf('Unsupported receptor type %s/%s for %s estimates in %s',...
type,whichDimension,source,species));
end
otherwise,
error(sprintf('Unsupported dimension %s requested',whichDimension));
end
otherwise,
error(sprintf('%s estimates not available for species %s',source,species));
end
% Nope!
otherwise
error(sprintf('Unknown source %s for photoreceptor dimension estimates',source));
end
end
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