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The Journal of Neuroscience, September 13, 2006, 26(37):9567-9578; doi:10.1523/JNEUROSCI.2256-06.2006
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Behavioral/Systems/Cognitive
Macaque V2 Neurons, But Not V1 Neurons, Show Choice-Related Activity
Hendrikje Nienborg andBruce G. Cumming Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892
Correspondence should be addressed to Hendrikje Nienborg, 49/2A50 Convent Drive, Bethesda, MD 20892-4435. Email: hn{at}lsr.nei.nih.gov
In the macaque extrastriate cortex, robust correlations between perceptual choice and neuronal response have been demonstrated, frequently quantified as choice probabilities (CPs). Such correlations are modest in early visual cortex, suggesting that CPs may depend on the position of a neuron in the hierarchy of visual processing. However, previous studies have not compared neurons with similar precision in equivalent tasks.
We investigated the role of cortical hierarchy on CP using a task for which significant CPs have been described previously for middle temporal area (MT). We measured CPs in disparity-selective neurons from both V1 and V2. The stimulus was a dynamic random dot stereogram, presented with a near or a far disparity, masked by varying numbers of binocularly uncorrelated dots. Two macaque monkeys reported whether they perceived a circular patch in front or behind a surrounding annulus in a forced choice task.
For V2 (n = 69), CP was on average 0.56, the first demonstration of systematic CPs in a visual area as early as V2. In V1 (n = 74), average CP was at chance level (0.51). The pattern was similar in a subgroup of neurons selected such that the statistical precision in the task was on average identical to that reported for MT (mean CP, 0.51 for V1, n = 33; 0.58 for V2, n = 54). This difference between V1 and V2 could not be explained by eye movements, stimulus size relative to the receptive field, or differences in disparity tuning. Rather, it seems to reflect a functional difference (at least in disparity processing) between striate and extrastriate cortex.
Key words: V2; macaque monkey; binocular disparity; striate cortex; choice probability; disparity discrimination
Received May 26, 2006; revised Aug. 4, 2006; accepted Aug. 7, 2006.
Correspondence should be addressed to Hendrikje Nienborg, 49/2A50 Convent Drive, Bethesda, MD 20892-4435. Email: hn{at}lsr.nei.nih.gov
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