Brain Evolution: When Is a Group Not a Group?

Brain Evolution: When Is a Group Not a Group?

In testing the 'social brain hypothesis' with comparative data, most research has used group size as an index of cognitive challenge. Recent work suggests that this measure is too crude to apply to a wide range of species, and biologists may need to develop other ways of extending these analyses.

When is a Group not a Group: An Empirical Examination of Metaphors for Online Social Structure

DES is not a Group

We prove that the set of DES permutations (encryption and decryption for each DES key) is not closed under functional composition. This implies that, in general, multiple DES-encryption is not equivalent to single DES-encryption, and that DES is not susceptible to a particular known-plaintext attack which requires, on average, 228 steps. We also show that the size of the subgroup generated by t...

Age is a number, not a group

1. Yaqub M, Ismail S, Babiker S, Sathyanarayana Rao TS. Psychiatrists’ responsibilities with regards to patients’ fitness to drive. Indian J Psychiatry 2016;58:287-90. 2. Roy S, Dasgupta A, Banerjee U, Chowdhury P, Mukhopadhyay A, Saha G, et al. Role of membrane cholesterol and lipid peroxidation in regulating the Na+/K+-ATPase activity in schizophrenia. Indian J Psychiatry 2016;58:317-25. 3. G...

When it is not a good fit: Clinical errors in patient selection and group composition in group psychotherapy.

Group psychotherapy provides unique opportunities for clinical errors in the selection of patients and composition of therapy groups. This article introduces some of the difficulties and complexities that can be associated with group composition and patient selection errors. Clinical vignettes from psychodynamic/interpersonal psychotherapy groups are used to illustrate three variations of group...